usage.js

'use strict'
/* global describe, it, beforeEach */

const checkUsage = require('../build/test/helpers/utils').checkOutput
const chalk = require('chalk')
const path = require('path')
const yargs = require('../')
const rebase = require('../yargs').rebase
const { YError } = require('../build/lib/yerror')

const should = require('chai').should()

const noop = () => {}

describe('usage tests', () => {
  beforeEach(() => {
    yargs.reset()
  })

  describe('demand options', () => {
    describe('using .demand()', () => {
      it('should show an error along with the missing arguments on demand fail', () => {
        const r = checkUsage(() => yargs('-x 10 -z 20')
          .usage('Usage: $0 -x NUM -y NUM')
          .demand(['x', 'y'])
          .wrap(null)
          .parse()
        )
        r.result.should.have.property('x', 10)
        r.result.should.have.property('z', 20)
        r.result.should.have.property('_').with.length(0)
        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: usage -x NUM -y NUM',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          '  -x  [required]',
          '  -y  [required]',
          'Missing required argument: y'
        ])
        r.logs.should.have.length(0)
        r.exit.should.equal(true)
      })

      it('missing argument message given if one command, but an argument not on the list is provided', () => {
        const r = checkUsage(() => yargs('wombat -w 10 -y 10')
          .usage('Usage: $0 -w NUM -m NUM')
          .demand(1, ['w', 'm'])
          .strict()
          .wrap(null)
          .parse()
        )
        r.result.should.have.property('w', 10)
        r.result.should.have.property('y', 10)
        r.result.should.have.property('_').with.length(1)
        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: usage -w NUM -m NUM',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          '  -w  [required]',
          '  -m  [required]',
          'Missing required argument: m'
        ])
        r.logs.should.have.length(0)
        r.exit.should.equal(true)
      })

      it('missing command message if all the required arguments exist, but not enough commands are provided', () => {
        const r = checkUsage(() => yargs('-w 10 -y 10')
          .usage('Usage: $0 -w NUM -m NUM')
          .demand(1, ['w', 'm'])
          .strict()
          .wrap(null)
          .parse()
        )
        r.result.should.have.property('w', 10)
        r.result.should.have.property('y', 10)
        r.result.should.have.property('_').with.length(0)
        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: usage -w NUM -m NUM',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          '  -w  [required]',
          '  -m  [required]',
          'Not enough non-option arguments: got 0, need at least 1'
        ])
        r.logs.should.have.length(0)
        r.exit.should.equal(true)
      })

      it('no failure occurs if the required arguments and the required number of commands are provided', () => {
        const r = checkUsage(() => yargs('wombat -w 10 -m 10')
          .usage('Usage: $0 -w NUM -m NUM')
          .command('wombat', 'wombat handlers')
          .demand(1, ['w', 'm'])
          .wrap(null)
          .parse()
        )

        r.result.should.have.property('w', 10)
        r.result.should.have.property('m', 10)
        r.result.should.have.property('_').with.length(1)
        r.should.have.property('errors').with.length(0)
        r.should.have.property('logs').with.length(0)
        r.should.have.property('exit', false)
      })

      describe('using .require()', () => {
        it('should show an error along with the missing arguments on demand fail', () => {
          const r = checkUsage(() => yargs('-x 10 -z 20')
            .usage('Usage: $0 -x NUM -y NUM')
            .require(['x', 'y'])
            .wrap(null)
            .parse()
          )
          r.result.should.have.property('x', 10)
          r.result.should.have.property('z', 20)
          r.result.should.have.property('_').with.length(0)
          r.errors.join('\n').split(/\n+/).should.deep.equal([
            'Usage: usage -x NUM -y NUM',
            'Options:',
            '  --help     Show help  [boolean]',
            '  --version  Show version number  [boolean]',
            '  -x  [required]',
            '  -y  [required]',
            'Missing required argument: y'
          ])
          r.logs.should.have.length(0)
          r.exit.should.equal(true)
        })
        it('missing argument message given if one command and an argument not on the list are provided', () => {
          const r = checkUsage(() => yargs('wombat -w 10 -y 10')
            .usage('Usage: $0 -w NUM -m NUM')
            .required(1, ['w', 'm'])
            .strict()
            .wrap(null)
            .parse()
          )
          r.result.should.have.property('w', 10)
          r.result.should.have.property('y', 10)
          r.result.should.have.property('_').with.length(1)
          r.errors.join('\n').split(/\n+/).should.deep.equal([
            'Usage: usage -w NUM -m NUM',
            'Options:',
            '  --help     Show help  [boolean]',
            '  --version  Show version number  [boolean]',
            '  -w  [required]',
            '  -m  [required]',
            'Missing required argument: m'
          ])
          r.logs.should.have.length(0)
          r.exit.should.equal(true)
        })
      })

      it('missing command message if all the required arguments exist, but not enough commands are provided', () => {
        const r = checkUsage(() => yargs('-w 10 -y 10')
          .usage('Usage: $0 -w NUM -m NUM')
          .require(1, ['w', 'm'])
          .strict()
          .wrap(null)
          .parse()
        )
        r.result.should.have.property('w', 10)
        r.result.should.have.property('y', 10)
        r.result.should.have.property('_').with.length(0)
        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: usage -w NUM -m NUM',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          '  -w  [required]',
          '  -m  [required]',
          'Not enough non-option arguments: got 0, need at least 1'
        ])
        r.logs.should.have.length(0)
        r.exit.should.equal(true)
      })
    })

    it('should show an error along with a custom message on demand fail', () => {
      const r = checkUsage(() => yargs('-z 20')
        .usage('Usage: $0 -x NUM -y NUM')
        .demand(['x', 'y'], 'x and y are both required to multiply all the things')
        .wrap(null)
        .parse()
      )
      r.result.should.have.property('z', 20)
      r.result.should.have.property('_').with.length(0)
      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Usage: usage -x NUM -y NUM',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  -x  [required]',
        '  -y  [required]',
        'Missing required arguments: x, y',
        'x and y are both required to multiply all the things'
      ])
      r.logs.should.have.length(0)
      r.exit.should.equal(true)
    })

    it('should return valid values when demand passes', () => {
      const r = checkUsage(() => yargs('-x 10 -y 20')
        .usage('Usage: $0 -x NUM -y NUM')
        .demand(['x', 'y'])
        .wrap(null)
        .parse()
      )
      r.should.have.property('result')
      r.result.should.have.property('x', 10)
      r.result.should.have.property('y', 20)
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('errors').with.length(0)
      r.should.have.property('logs').with.length(0)
      r.should.have.property('exit', false)
    })

    it('should not show a custom message if msg is null', () => {
      const r = checkUsage(() => yargs('')
        .usage('Usage: foo')
        .demand(1, null)
        .wrap(null)
        .parse()
      )

      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Usage: foo',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        ''
      ])
    })

    // see #169.
    describe('min/max demanded count', () => {
      it("does not output an error if '_' count is within the min/max range", () => {
        const r = checkUsage(() => yargs(['foo', 'bar', 'apple'])
          .usage('Usage: foo')
          .demand(2, 3)
          .wrap(null)
          .parse()
        )

        r.errors.length.should.equal(0)
      })

      it("outputs an error if '_' count is above max", () => {
        const r = checkUsage(() => yargs(['foo', 'bar', 'apple', 'banana'])
          .usage('Usage: foo')
          .demand(2, 3)
          .wrap(null)
          .parse()
        )

        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: foo',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          'Too many non-option arguments: got 4, maximum of 3'
        ])
      })

      it("outputs an error if '_' count is below min", () => {
        const r = checkUsage(() => yargs(['foo'])
          .usage('Usage: foo')
          .demand(2, 3)
          .wrap(null)
          .parse()
        )

        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: foo',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          'Not enough non-option arguments: got 1, need at least 2'
        ])
      })

      it('allows a customer error message to be provided', () => {
        const r = checkUsage(() => yargs(['foo'])
          .usage('Usage: foo')
          .demand(2, 3, 'pork chop sandwiches')
          .wrap(null)
          .parse()
        )

        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: foo',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          'pork chop sandwiches'
        ])
      })

      it("shouldn't interpret the second argument as a max when it is an array", () => {
        const r = checkUsage(() => yargs(['koala', 'wombat', '--1'])
          .usage('Usage: foo')
          .demand(1, ['1'])
          .wrap(null)
          .parse()
        )

        r.errors.length.should.equal(0)
      })
    })
  })

  describe('deprecate options', () => {
    describe('using .option(x, {deprecate: [boolean|string]})', () => {
      it('{deprecated: true} should show [deprecated]', () => {
        const r = checkUsage(() => yargs('--help')
          .option('x', { deprecated: true })
          .wrap(null)
          .parse()
        )
        r.logs[0].should.include('  -x  [deprecated]')
      })
      it('{deprecated: string} should show [deprecated: string]', () => {
        const r = checkUsage(() => yargs('--help')
          .option('x', { deprecated: 'string' })
          .wrap(null)
          .parse()
        )
        r.logs[0].should.include('  -x  [deprecated: string]')
      })
      it('{deprecated: boolean} in sub-command', () => {
        const r = checkUsage(() => yargs('command --help')
          .option('x', { deprecated: true })
          .command('command', 'command', yargs => yargs.option('y', { deprecated: true }))
          .wrap(null)
          .parse()
        )
        r.logs[0].should.include('  -x  [deprecated]')
        r.logs[0].should.include('  -y  [deprecated]')
      })
      it('{deprecated: string} in sub-command', () => {
        const r = checkUsage(() => yargs('command --help')
          .option('x', { deprecated: 'string' })
          .command('command', 'command', yargs => yargs.option('y', { deprecated: 'string' }))
          .wrap(null)
          .parse()
        )
        r.logs[0].should.include('  -x  [deprecated: string]')
        r.logs[0].should.include('  -y  [deprecated: string]')
      })
    })
    describe('using .deprecateOption(x, [string])', () => {
      it('.deprecateOption(x) should show [deprecated]', () => {
        const r = checkUsage(() => yargs('--help')
          .option('x')
          .deprecateOption('x')
          .wrap(null)
          .parse()
        )
        r.logs[0].should.include('  -x  [deprecated]')
      })
      it('.deprecateOption(x, string) should show [deprecated: string]', () => {
        const r = checkUsage(() => yargs('--help')
          .option('x')
          .deprecateOption('x', 'string')
          .wrap(null)
          .parse()
        )
        r.logs[0].should.include('  -x  [deprecated: string]')
      })
      it('.deprecateOption(x) in a sub-command', () => {
        const r = checkUsage(() => yargs('command --help')
          .option('x')
          .deprecateOption('x')
          .command('command', 'command', yargs => yargs.option('y').deprecateOption('y'))
          .wrap(null)
          .parse()
        )
        r.logs[0].should.include('  -x  [deprecated]')
        r.logs[0].should.include('  -y  [deprecated]')
      })
      it('.deprecateOption(x, string) in a sub-command', () => {
        const r = checkUsage(() => yargs('command --help')
          .option('x')
          .deprecateOption('x', 'string')
          .command('command', 'command', yargs => yargs.option('y').deprecateOption('y', 'string'))
          .wrap(null)
          .parse()
        )
        r.logs[0].should.include('  -x  [deprecated: string]')
        r.logs[0].should.include('  -y  [deprecated: string]')
      })
    })
  })

  it('should return valid values when check passes', () => {
    const r = checkUsage(() => yargs('-x 10 -y 20')
      .usage('Usage: $0 -x NUM -y NUM')
      .check((argv) => {
        if (!('x' in argv)) throw Error('You forgot about -x')
        if (!('y' in argv)) throw Error('You forgot about -y')
        else return true
      })
      .parse()
    )
    r.should.have.property('result')
    r.result.should.have.property('x', 10)
    r.result.should.have.property('y', 20)
    r.result.should.have.property('_').with.length(0)
    r.should.have.property('errors').with.length(0)
    r.should.have.property('logs').with.length(0)
    r.should.have.property('exit', false)
  })

  it('should display missing arguments when check fails with a thrown exception', () => {
    const r = checkUsage(() => yargs('-x 10 -z 20')
      .usage('Usage: $0 -x NUM -y NUM')
      .wrap(null)
      .check((argv) => {
        if (!('x' in argv)) throw Error('You forgot about -x')
        if (!('y' in argv)) throw Error('You forgot about -y')
      })
      .parse()
    )
    r.should.have.property('result')
    r.result.should.have.property('x', 10)
    r.result.should.have.property('z', 20)
    r.result.should.have.property('_').with.length(0)
    r.errors.join('\n').split(/\n+/).should.deep.equal([
      'Usage: usage -x NUM -y NUM',
      'Options:',
      '  --help     Show help  [boolean]',
      '  --version  Show version number  [boolean]',
      'You forgot about -y'
    ])
    r.should.have.property('logs').with.length(0)
    r.should.have.property('exit').and.equal(true)
  })

  it('should display missing arguments when check fails with a return value', () => {
    const r = checkUsage(() => yargs('-x 10 -z 20')
      .usage('Usage: $0 -x NUM -y NUM')
      .wrap(null)
      .check((argv) => {
        if (!('x' in argv)) return 'You forgot about -x'
        if (!('y' in argv)) return 'You forgot about -y'
      })
      .parse()
    )
    r.should.have.property('result')
    r.result.should.have.property('x', 10)
    r.result.should.have.property('z', 20)
    r.result.should.have.property('_').with.length(0)
    r.should.have.property('logs').with.length(0)
    r.should.have.property('exit').and.equal(true)
    r.should.have.property('errors')
    r.errors.join('\n').split(/\n+/).should.deep.equal([
      'Usage: usage -x NUM -y NUM',
      'Options:',
      '  --help     Show help  [boolean]',
      '  --version  Show version number  [boolean]',
      'You forgot about -y'
    ])
  })

  it('should return a valid result when check condition passes', () => {
    function checker (argv) {
      return 'x' in argv && 'y' in argv
    }
    const r = checkUsage(() => yargs('-x 10 -y 20')
      .usage('Usage: $0 -x NUM -y NUM')
      .check(checker)
      .parse()
    )
    r.should.have.property('result')
    r.result.should.have.property('x', 10)
    r.result.should.have.property('y', 20)
    r.result.should.have.property('_').with.length(0)
    r.should.have.property('errors').with.length(0)
    r.should.have.property('logs').with.length(0)
    r.should.have.property('exit', false)
  })

  it('should display a failed message when check condition fails', () => {
    function checker (argv) {
      return 'x' in argv && 'y' in argv
    }
    const r = checkUsage(() => yargs('-x 10 -z 20')
      .usage('Usage: $0 -x NUM -y NUM')
      .check(checker)
      .wrap(null)
      .parse()
    )
    r.should.have.property('result')
    r.result.should.have.property('x', 10)
    r.result.should.have.property('z', 20)
    r.result.should.have.property('_').with.length(0)
    r.should.have.property('logs').with.length(0)
    r.should.have.property('exit').and.equal(true)
    r.should.have.property('errors')
    r.errors.join('\n').split(/\n+/).join('\n').should.equal(
      'Usage: usage -x NUM -y NUM\n' +
      'Options:\n' +
      '  --help     Show help  [boolean]\n' +
      '  --version  Show version number  [boolean]\n' +
      `Argument check failed: ${checker.toString()}`
    )
  })

  describe('when exitProcess is false', () => {
    describe('when check fails with a thrown exception', () => {
      it('should display missing arguments once', () => {
        const r = checkUsage(() => {
          try {
            return yargs('-x 10 -z 20')
              .usage('Usage: $0 -x NUM -y NUM')
              .exitProcess(false)
              .wrap(null)
              .check((argv) => {
                if (!('x' in argv)) throw Error('You forgot about -x')
                if (!('y' in argv)) throw Error('You forgot about -y')
              })
              .parse()
          } catch (err) {
            // ignore the error, we only test the output here
          }
        })
        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: usage -x NUM -y NUM',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          'You forgot about -y'
        ])
        r.should.have.property('logs').with.length(0)
        r.should.have.property('exit').and.equal(false)
      })
    })
    describe('fail()', () => {
      it('is called with the original error message as the first parameter', () => {
        const r = checkUsage(() => {
          try {
            return yargs()
              .fail((message) => {
                console.log(message)
              })
              .exitProcess(false)
              .wrap(null)
              .check((argv) => {
                throw new Error('foo')
              })
              .parse()
          } catch (error) {

          }
        })
        r.logs.should.deep.equal(['foo'])
        r.should.have.property('exit').and.equal(false)
      })

      it('is invoked with yargs instance as third argument', () => {
        const r = checkUsage(() => yargs('foo')
          .command('foo', 'desc', {
            bar: {
              describe: 'bar command'
            }
          }, (argv) => {
            throw new YError('blah')
          })
          .fail((message, error, yargs) => {
            yargs.showHelp()
          })
          .exitProcess(false)
          .wrap(null)
          .parse()
        )

        r.errors[0].should.contain('bar command')
      })

      describe('when check() throws error', () => {
        it('fail() is called with the original error object as the second parameter', () => {
          const r = checkUsage(() => {
            try {
              return yargs()
                .fail((message, error) => {
                  console.log(error.message)
                })
                .exitProcess(false)
                .wrap(null)
                .check(() => {
                  throw new Error('foo')
                })
                .parse()
            } catch (error) {

            }
          })
          r.logs.should.deep.equal(['foo'])
          r.should.have.property('exit').and.equal(false)
        })
      })
      describe('when command() throws error', () => {
        it('fail() is called with the original error object as the second parameter', () => {
          const r = checkUsage(() => {
            try {
              return yargs('test')
                .fail(() => {
                  console.log('is triggered last')
                })
                .exitProcess(false)
                .wrap(null)
                .command('test', 'test', (subYargs) => {
                  subYargs
                    .fail((message, error) => {
                      console.log([error.name, error.message])
                    })
                    .exitProcess(false)
                }, (argv) => {
                  throw new YError('foo')
                })
                .parse()
            } catch (error) {

            }
          })
          r.logs.should.deep.equal(["[ 'YError', 'foo' ]", 'is triggered last'])
          r.should.have.property('exit').and.equal(false)
        })
      })
    })
  })

  it('should return a valid result when demanding a count of non-hyphenated values', () => {
    const r = checkUsage(() => yargs('1 2 3 --moo')
      .usage('Usage: $0 [x] [y] [z] {OPTIONS}')
      .demand(3)
      .parse()
    )
    r.should.have.property('result')
    r.should.have.property('errors').with.length(0)
    r.should.have.property('logs').with.length(0)
    r.should.have.property('exit', false)
    r.result.should.have.property('_').and.deep.equal([1, 2, 3])
    r.result.should.have.property('moo', true)
  })

  it('should return a failure message when not enough non-hyphenated arguments are found after a demand count', () => {
    const r = checkUsage(() => yargs('1 2 --moo')
      .usage('Usage: $0 [x] [y] [z] {OPTIONS}')
      .demand(3)
      .wrap(null)
      .parse()
    )
    r.should.have.property('result')
    r.should.have.property('logs').with.length(0)
    r.should.have.property('exit').and.equal(true)
    r.result.should.have.property('_').and.deep.equal([1, 2])
    r.result.should.have.property('moo', true)
    r.should.have.property('errors')
    r.errors.join('\n').split(/\n+/).should.deep.equal([
      'Usage: usage [x] [y] [z] {OPTIONS}',
      'Options:',
      '  --help     Show help  [boolean]',
      '  --version  Show version number  [boolean]',
      'Not enough non-option arguments: got 2, need at least 3'
    ])
  })

  it('should return a custom failure message when not enough non-hyphenated arguments are found after a demand count', () => {
    const r = checkUsage(() => yargs('src --moo')
      .usage('Usage: $0 [x] [y] [z] {OPTIONS} <src> <dest> [extra_files...]')
      .demand(2, 'src and dest files are both required')
      .wrap(null)
      .parse()
    )
    r.should.have.property('result')
    r.should.have.property('logs').with.length(0)
    r.should.have.property('exit').and.equal(true)
    r.result.should.have.property('_').and.deep.equal(['src'])
    r.result.should.have.property('moo', true)
    r.should.have.property('errors')
    r.errors.join('\n').split(/\n+/).should.deep.equal([
      'Usage: usage [x] [y] [z] {OPTIONS} <src> <dest> [extra_files...]',
      'Options:',
      '  --help     Show help  [boolean]',
      '  --version  Show version number  [boolean]',
      'src and dest files are both required'
    ])
  })

  it('should return a valid result when setting defaults for singles', () => {
    const r = checkUsage(() => yargs('--foo 50 --baz 70 --powsy')
      .default('foo', 5)
      .default('bar', 6)
      .default('baz', 7)
      .parse()
    )
    r.should.have.property('result')
    r.result.should.have.property('foo', 50)
    r.result.should.have.property('bar', 6)
    r.result.should.have.property('baz', 70)
    r.result.should.have.property('powsy', true)
    r.result.should.have.property('_').with.length(0)
  })

  it('should return a valid result when default is set for an alias', () => {
    const r = checkUsage(() => yargs('')
      .alias('f', 'foo')
      .default('f', 5)
      .parse()
    )
    r.should.have.property('result')
    r.result.should.have.property('f', 5)
    r.result.should.have.property('foo', 5)
    r.result.should.have.property('_').with.length(0)
  })

  it('should print a single line when failing and default is set for an alias', () => {
    const r = checkUsage(() => yargs('')
      .alias('f', 'foo')
      .default('f', 5)
      .demand(1)
      .wrap(null)
      .parse()
    )
    r.errors.join('\n').split(/\n+/).should.deep.equal([
      'Options:',
      '  --help     Show help  [boolean]',
      '  --version  Show version number  [boolean]',
      '  -f, --foo  [default: 5]',
      'Not enough non-option arguments: got 0, need at least 1'
    ])
  })

  it('should allow you to set default values for a hash of options', () => {
    const r = checkUsage(() => yargs('--foo 50 --baz 70')
      .default({ foo: 10, bar: 20, quux: 30 })
      .parse()
    )
    r.should.have.property('result')
    r.result.should.have.property('_').with.length(0)
    r.result.should.have.property('foo', 50)
    r.result.should.have.property('baz', 70)
    r.result.should.have.property('bar', 20)
    r.result.should.have.property('quux', 30)
  })

  describe('required arguments', () => {
    describe('with options object', () => {
      it('should show a failure message if a required option is missing', () => {
        const r = checkUsage(() => {
          const opts = {
            foo: { description: 'foo option', alias: 'f', requiresArg: true },
            bar: { description: 'bar option', alias: 'b', requiresArg: true }
          }

          return yargs('-f --bar 20')
            .usage('Usage: $0 [options]')
            .options(opts)
            .wrap(null)
            .parse()
        })
        r.should.have.property('result')
        r.result.should.have.property('_').with.length(0)
        r.should.have.property('errors')
        r.should.have.property('logs').with.length(0)
        r.should.have.property('exit').and.equal(true)
        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: usage [options]',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          '  --foo, -f  foo option',
          '  --bar, -b  bar option',
          'Not enough arguments following: f'
        ])
      })

      it('should show a failure message if more than one required option is missing', () => {
        const r = checkUsage(() => {
          const opts = {
            foo: { description: 'foo option', alias: 'f', requiresArg: true },
            bar: { description: 'bar option', alias: 'b', requiresArg: true }
          }

          return yargs('-f --bar')
            .usage('Usage: $0 [options]')
            .options(opts)
            .wrap(null)
            .parse()
        })
        r.should.have.property('result')
        r.result.should.have.property('_').with.length(0)
        r.should.have.property('errors')
        r.should.have.property('logs').with.length(0)
        r.should.have.property('exit').and.equal(true)
        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: usage [options]',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          '  --foo, -f  foo option',
          '  --bar, -b  bar option',
          'Not enough arguments following: bar'
        ])
      })
    })

    describe('with requiresArg method', () => {
      it('should show a failure message if a required option is missing', () => {
        const r = checkUsage(() => {
          const opts = {
            foo: { description: 'foo option', alias: 'f' },
            bar: { description: 'bar option', alias: 'b' }
          }

          return yargs('-f --bar 20')
            .usage('Usage: $0 [options]')
            .options(opts)
            .requiresArg(['foo', 'bar'])
            .wrap(null)
            .parse()
        })
        r.should.have.property('result')
        r.result.should.have.property('_').with.length(0)
        r.should.have.property('errors')
        r.should.have.property('logs').with.length(0)
        r.should.have.property('exit').and.equal(true)
        r.errors.join('\n').split(/\n+/).should.deep.equal([
          'Usage: usage [options]',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          '  --foo, -f  foo option',
          '  --bar, -b  bar option',
          'Not enough arguments following: f'
        ])
      })
    })

    it("still requires argument if 'type' hints are given", () => {
      const r = checkUsage(() => yargs('--foo --bar')
        .requiresArg('foo')
        .string('foo')
        .requiresArg('bar')
        .array('bar')
        .wrap(null)
        .parse()
      )

      r.errors[2].should.equal('Not enough arguments following: bar')
    })
  })

  describe('with strict() option set', () => {
    it('should fail given an option argument that is not demanded', () => {
      const r = checkUsage(() => {
        const opts = {
          foo: { demand: 'foo option', alias: 'f' },
          bar: { demand: 'bar option', alias: 'b' }
        }

        return yargs('-f 10 --bar 20 --baz 30')
          .usage('Usage: $0 [options]')
          .options(opts)
          .strict()
          .wrap(null)
          .parse()
      })

      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.result.should.have.property('f', 10)
      r.result.should.have.property('foo', 10)
      r.result.should.have.property('b', 20)
      r.result.should.have.property('bar', 20)
      r.result.should.have.property('baz', 30)
      r.should.have.property('errors')
      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Usage: usage [options]',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  --foo, -f  [required]',
        '  --bar, -b  [required]',
        'Unknown argument: baz'
      ])
      r.should.have.property('logs').with.length(0)
      r.should.have.property('exit').and.equal(true)
    })

    describe('with hyphens in options', () => {
      it('fails when an invalid argument is provided', (done) => {
        return yargs('--foo-bar')
          .strict()
          .fail((msg) => {
            return done()
          })
          .argv
      })

      it('accepts valid options', () => {
        const r = checkUsage(() => {
          const opts = {
            '--foo-bar': { description: 'foo bar option' },
            '--bar-baz': { description: 'bar baz option' }
          }

          return yargs('--foo-bar --bar-baz')
            .options(opts)
            .strict()
            .parse()
        })

        r.result.should.have.property('foo-bar', true)
        r.result.should.have.property('fooBar', true)
        r.result.should.have.property('bar-baz', true)
        r.result.should.have.property('barBaz', true)
      })

      it('works with aliases', () => {
        const r = checkUsage(() => {
          const opts = {
            '--foo-bar': { description: 'foo bar option', alias: 'f' },
            '--bar-baz': { description: 'bar baz option', alias: 'b' }
          }

          return yargs('--foo-bar -b')
            .options(opts)
            .strict()
            .parse()
        })

        r.result.should.have.property('foo-bar', true)
        r.result.should.have.property('fooBar', true)
        r.result.should.have.property('f', true)
        r.result.should.have.property('bar-baz', true)
        r.result.should.have.property('barBaz', true)
        r.result.should.have.property('b', true)
      })

      it('accepts mixed options with values', () => {
        const r = checkUsage(() => {
          const opts = {
            '--foo-bar': { description: 'foo bar option', demand: true },
            '--baz': { description: 'baz option', demand: true }
          }

          return yargs('--foo-bar 150 --baz')
            .options(opts)
            .strict()
            .parse()
        })

        r.result.should.have.property('foo-bar', 150)
        r.result.should.have.property('fooBar', 150)
        r.result.should.have.property('baz', true)
      })
    })

    it('should fail given an option argument without a corresponding description', () => {
      const r = checkUsage(() => {
        const opts = {
          foo: { description: 'foo option', alias: 'f' },
          bar: { description: 'bar option', alias: 'b' }
        }

        return yargs('-f 10 --bar 20 --baz 30')
          .usage('Usage: $0 [options]')
          .options(opts)
          .strict()
          .wrap(null)
          .parse()
      })

      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.result.should.have.property('f', 10)
      r.result.should.have.property('foo', 10)
      r.result.should.have.property('b', 20)
      r.result.should.have.property('bar', 20)
      r.result.should.have.property('baz', 30)
      r.should.have.property('errors')
      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Usage: usage [options]',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  --foo, -f  foo option',
        '  --bar, -b  bar option',
        'Unknown argument: baz'
      ])
      r.should.have.property('logs').with.length(0)
      r.should.have.property('exit').and.equal(true)
    })

    it('should fail given multiple option arguments without corresponding descriptions', () => {
      const r = checkUsage(() => {
        const opts = {
          foo: { description: 'foo option', alias: 'f' },
          bar: { description: 'bar option', alias: 'b' }
        }

        return yargs('-f 10 --bar 20 --baz 30 -q 40')
          .usage('Usage: $0 [options]')
          .options(opts)
          .strict()
          .wrap(null)
          .parse()
      })

      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.result.should.have.property('f', 10)
      r.result.should.have.property('foo', 10)
      r.result.should.have.property('b', 20)
      r.result.should.have.property('bar', 20)
      r.result.should.have.property('baz', 30)
      r.result.should.have.property('q', 40)
      r.should.have.property('errors')
      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Usage: usage [options]',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  --foo, -f  foo option',
        '  --bar, -b  bar option',
        'Unknown arguments: baz, q'
      ])
      r.should.have.property('logs').with.length(0)
      r.should.have.property('exit').and.equal(true)
    })

    it('should pass given option arguments with corresponding descriptions', () => {
      const r = checkUsage(() => {
        const opts = {
          foo: { description: 'foo option' },
          bar: { description: 'bar option' }
        }

        return yargs('--foo 10 --bar 20')
          .usage('Usage: $0 [options]')
          .options(opts)
          .strict()
          .parse()
      })

      r.should.have.property('result')
      r.result.should.have.property('foo', 10)
      r.result.should.have.property('bar', 20)
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('errors').with.length(0)
      r.should.have.property('logs').with.length(0)
      r.should.have.property('exit', false)
    })
  })

  it('should display example on fail', () => {
    const r = checkUsage(() => yargs('')
      .example('$0 something', 'description')
      .example('$0 something else', 'other description')
      .demand(['y'])
      .wrap(null)
      .parse()
    )
    r.should.have.property('result')
    r.result.should.have.property('_').with.length(0)
    r.should.have.property('errors')
    r.should.have.property('logs').with.length(0)
    r.should.have.property('exit').and.equal(true)
    r.errors.join('\n').split(/\n+/).should.deep.equal([
      'Options:',
      '  --help     Show help  [boolean]',
      '  --version  Show version number  [boolean]',
      '  -y  [required]',
      'Examples:',
      '  usage something       description',
      '  usage something else  other description',
      'Missing required argument: y'
    ])
  })

  it('should display examples on fail when passing multiple examples at once', () => {
    const r = checkUsage(() => yargs('')
      .example([
        ['$0 something', 'description'],
        ['$0 something else', 'other description']
      ])
      .demand(['y'])
      .wrap(null)
      .parse()
    )
    r.should.have.property('result')
    r.result.should.have.property('_').with.length(0)
    r.should.have.property('errors')
    r.should.have.property('logs').with.length(0)
    r.should.have.property('exit').and.equal(true)
    r.errors.join('\n').split(/\n+/).should.deep.equal([
      'Options:',
      '  --help     Show help  [boolean]',
      '  --version  Show version number  [boolean]',
      '  -y  [required]',
      'Examples:',
      '  usage something       description',
      '  usage something else  other description',
      'Missing required argument: y'
    ])
  })

  describe('demand option with boolean flag', () => {
    describe('with demand option', () => {
      it('should report missing required arguments', () => {
        const r = checkUsage(() => yargs('-y 10 -z 20')
          .usage('Usage: $0 -x NUM [-y NUM]')
          .options({
            x: { description: 'an option', demand: true },
            y: { description: 'another option', demand: false }
          })
          .wrap(null)
          .parse()
        )
        r.result.should.have.property('y', 10)
        r.result.should.have.property('z', 20)
        r.result.should.have.property('_').with.length(0)
        r.errors.join('\n').split(/\n/).should.deep.equal([
          'Usage: usage -x NUM [-y NUM]',
          '',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          '  -x         an option  [required]',
          '  -y         another option',
          '',
          'Missing required argument: x'
        ])
        r.logs.should.have.length(0)
        r.exit.should.equal(true)
      })
    })

    describe('with required option', () => {
      it('should report missing required arguments', () => {
        const r = checkUsage(() => yargs('-y 10 -z 20')
          .usage('Usage: $0 -x NUM [-y NUM]')
          .options({
            x: { description: 'an option', required: true },
            y: { description: 'another option', required: false }
          })
          .wrap(null)
          .parse()
        )
        r.result.should.have.property('y', 10)
        r.result.should.have.property('z', 20)
        r.result.should.have.property('_').with.length(0)
        r.errors.join('\n').split(/\n/).should.deep.equal([
          'Usage: usage -x NUM [-y NUM]',
          '',
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          '  -x         an option  [required]',
          '  -y         another option',
          '',
          'Missing required argument: x'
        ])
        r.logs.should.have.length(0)
        r.exit.should.equal(true)
      })
    })

    it('should not report missing required arguments when given an alias', () => {
      const r = checkUsage(() => yargs('-w 10')
        .usage('Usage: $0 --width NUM [--height NUM]')
        .options({
          width: { description: 'Width', alias: 'w', demand: true },
          height: { description: 'Height', alias: 'h', demand: false }
        })
        .wrap(null)
        .parse()
      )
      r.result.should.have.property('w', 10)
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('errors').with.length(0)
      r.logs.should.have.length(0)
    })
  })

  describe('help option', () => {
    it('should display usage', () => {
      const r = checkUsage(() => yargs(['--help'])
        .demand(['y'])
        .wrap(null)
        .parse()
      )
      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('errors')
      r.should.have.property('logs').with.length(1)
      r.should.have.property('exit').and.equal(true)
      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  -y  [required]'
      ])
    })

    it('should not show both dashed and camelCase aliases', () => {
      const r = checkUsage(() => yargs(['--help'])
        .usage('Usage: $0 options')
        .describe('some-opt', 'Some option')
        .default('some-opt', 2)
        .wrap(null)
        .parse()
      )
      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('exit').and.equal(true)
      r.should.have.property('errors').with.length(0)
      r.should.have.property('logs')
      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Usage: usage options',
        'Options:',
        '  --help      Show help  [boolean]',
        '  --version   Show version number  [boolean]',
        '  --some-opt  Some option  [default: 2]'
      ])
    })

    it('should use 2 dashes for general 1-digit usage', () => {
      const r = checkUsage(() => yargs(['--help'])
        .option('1', {
          type: 'string',
          description: 'First one',
          default: 'first'
        })
        .wrap(null)
        .parse()
      )
      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('exit').and.equal(true)
      r.should.have.property('errors').with.length(0)
      r.should.have.property('logs')
      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --1        First one  [string] [default: "first"]',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('should use single dashes for 1-digit boolean key usage', () => {
      const r = checkUsage(() => yargs(['--help'])
        .option('1', {
          type: 'boolean',
          description: 'Negative one'
        })
        .wrap(null)
        .parse()
      )
      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('exit').and.equal(true)
      r.should.have.property('errors').with.length(0)
      r.should.have.property('logs')
      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  -1         Negative one  [boolean]',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('should use single dashes for 1-digit boolean alias usage', () => {
      const r = checkUsage(() => yargs(['--help'])
        .option('negativeone', {
          alias: '1',
          type: 'boolean',
          description: 'Negative one'
        })
        .wrap(null)
        .parse()
      )
      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('exit').and.equal(true)
      r.should.have.property('errors').with.length(0)
      r.should.have.property('logs')
      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --help             Show help  [boolean]',
        '  --version          Show version number  [boolean]',
        '  --negativeone, -1  Negative one  [boolean]'
      ])
    })

    it('should use 2 dashes for multiple-digit alias usage', () => {
      const r = checkUsage(() => yargs(['--help'])
        .option('onehundred', {
          alias: '100',
          type: 'boolean',
          description: 'one hundred'
        })
        .wrap(null)
        .parse()
      )
      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('exit').and.equal(true)
      r.should.have.property('errors').with.length(0)
      r.should.have.property('logs')
      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --help               Show help  [boolean]',
        '  --version            Show version number  [boolean]',
        '  --onehundred, --100  one hundred  [boolean]'
      ])
    })

    describe('when exitProcess is false', () => {
      it('should not validate arguments (required argument)', () => {
        const r = checkUsage(() => yargs(['--help'])
          .usage('Usage: $0 options')
          .alias('help', 'h')
          .describe('some-opt', 'Some option')
          .demand('some-opt')
          .wrap(null)
          .exitProcess(false)
          .parse()
        )
        r.should.have.property('result')
        r.result.should.have.property('_').with.length(0)
        r.result.should.have.property('help').and.equal(true)
        r.result.should.have.property('h').and.equal(true)
        r.should.have.property('exit').and.equal(false)
        r.should.have.property('errors').with.length(0)
        r.should.have.property('logs')
        r.logs.join('\n').split(/\n+/).should.deep.equal([
          'Usage: usage options',
          'Options:',
          '  --help, -h  Show help  [boolean]',
          '  --version   Show version number  [boolean]',
          '  --some-opt  Some option  [required]'
        ])
      })

      // We need both this and the previous spec because a required argument
      // is a validation error and nargs is a parse error
      it('should not validate arguments (nargs)', () => {
        const r = checkUsage(() => yargs(['--help', '--some-opt'])
          .usage('Usage: $0 options')
          .alias('help', 'h')
          .describe('some-opt', 'Some option')
          .demand('some-opt')
          .nargs('some-opt', 3)
          .wrap(null)
          .exitProcess(false)
          .parse()
        )
        r.should.have.property('result')
        r.result.should.have.property('_').with.length(0)
        r.result.should.have.property('help').and.equal(true)
        r.result.should.have.property('h').and.equal(true)
        r.should.have.property('exit').and.equal(false)
        r.should.have.property('errors').with.length(0)
        r.should.have.property('logs')
        r.logs.join('\n').split(/\n+/).should.deep.equal([
          'Usage: usage options',
          'Options:',
          '  --help, -h  Show help  [boolean]',
          '  --version   Show version number  [boolean]',
          '  --some-opt  Some option  [required]'
        ])
      })
    })
  })

  describe('version option', () => {
    it('should display version', () => {
      const r = checkUsage(() => yargs(['--version'])
        .version('version', 'Show version number', '1.0.1')
        .wrap(null)
        .parse()
      )
      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('errors')
      r.should.have.property('logs').with.length(1)
      r.should.have.property('exit').and.equal(true)
      r.logs[0].should.eql('1.0.1')
    })

    it('accepts version option as first argument, and version number as second argument', () => {
      const r = checkUsage(() => yargs(['--version'])
        .version('version', '1.0.0')
        .wrap(null)
        .parse()
      )
      r.logs[0].should.eql('1.0.0')
    })

    it("should default to 'version' as version option", () => {
      const r = checkUsage(() => yargs(['--version'])
        .version('1.0.2')
        .wrap(null)
        .parse()
      )
      r.logs[0].should.eql('1.0.2')
    })

    describe('when exitProcess is false', () => {
      it('should not validate arguments (required argument)', () => {
        const r = checkUsage(() => yargs(['--version'])
          .version('version', 'Show version number', '1.0.1')
          .demand('some-opt')
          .wrap(null)
          .exitProcess(false)
          .parse()
        )
        r.should.have.property('result')
        r.result.should.have.property('_').with.length(0)
        r.result.should.have.property('version').and.equal(true)
        r.should.have.property('exit').and.equal(false)
        r.should.have.property('errors').with.length(0)
        r.should.have.property('logs')
        r.logs[0].should.eql('1.0.1')
      })

      // We need both this and the previous spec because a required argument
      // is a validation error and nargs is a parse error
      it('should not validate arguments (nargs)', () => {
        const r = checkUsage(() => yargs(['--version', '--some-opt'])
          .nargs('some-opt', 3)
          .version('version', 'Show version number', '1.0.1')
          .wrap(null)
          .exitProcess(false)
          .parse()
        )
        r.should.have.property('result')
        r.result.should.have.property('_').with.length(0)
        r.result.should.have.property('version').and.equal(true)
        r.should.have.property('exit').and.equal(false)
        r.should.have.property('errors').with.length(0)
        r.should.have.property('logs')
        r.logs[0].should.eql('1.0.1')
      })
    })
  })

  describe('showHelpOnFail', () => {
    it('should display user supplied message', () => {
      const opts = {
        foo: { desc: 'foo option', alias: 'f' },
        bar: { desc: 'bar option', alias: 'b' }
      }

      const r = checkUsage(() => yargs(['--foo'])
        .usage('Usage: $0 [options]')
        .options(opts)
        .demand(['foo', 'bar'])
        .showHelpOnFail(false, 'Specify --help for available options')
        .wrap(null)
        .parse()
      )
      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('errors')
      r.should.have.property('logs').with.length(0)
      r.should.have.property('exit').and.equal(true)
      r.errors.join('\n').split(/\n/).should.deep.equal([
        'Missing required argument: bar',
        '',
        'Specify --help for available options'
      ])
    })
  })

  describe('exitProcess', () => {
    it('should not call process.exit on error if disabled', () => {
      const opts = {
        foo: { desc: 'foo option', alias: 'f' }
      }

      const r = checkUsage(() => yargs(['--foo'])
        .exitProcess(false)
        .usage('Usage: $0 [options]')
        .options(opts)
        .demand(['foo'])
        .wrap(null)
        .parse()
      )
      r.should.have.property('result')
      r.result.should.have.property('_').with.length(0)
      r.should.have.property('errors')
      r.should.have.property('logs').with.length(0)
      r.should.have.property('exit').and.equal(false)
    })
  })

  describe('scriptName', () => {
    it('should display user supplied scriptName', () => {
      const r = checkUsage(() => yargs(['--help'])
        .scriptName('custom')
        .command('command')
        .parse()
      )
      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'custom [command]',
        'Commands:',
        '  custom command',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
      r.errors.should.have.length(0)
      r.exit.should.equal(true)
    })

    it('should not alter the user supplied scriptName', () => {
      const r = checkUsage(() => yargs(['--help'])
        .scriptName('./custom')
        .command('command')
        .parse()
      )
      r.logs.join('\n').split(/\n+/).should.deep.equal([
        './custom [command]',
        'Commands:',
        '  ./custom command',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
      r.errors.should.have.length(0)
      r.exit.should.equal(true)
    })
  })

  it('should succeed when rebase', () => {
    rebase(['home', 'chevex'].join(path.sep), ['home', 'chevex', 'foo', 'bar', 'baz'].join(path.sep)).should.equal(['foo', 'bar', 'baz'].join(path.sep))
    rebase(['home', 'chevex', 'foo', 'bar', 'baz'].join(path.sep), ['home', 'chevex'].join(path.sep)).should.equal(['..', '..', '..'].join(path.sep))
    rebase(['home', 'chevex', 'foo'].join(path.sep), ['home', 'chevex', 'pow', 'zoom.txt'].join(path.sep)).should.equal(['..', 'pow', 'zoom.txt'].join(path.sep))
  })

  it('should not print usage string if help() is called without arguments', () => {
    const r = checkUsage(() => yargs([]).usage('foo').help().parse())

    r.logs.length.should.equal(0)
  })

  it('should add --help as an option for printing usage text if help() is called without arguments', () => {
    const r = checkUsage(() => yargs(['--help']).usage('foo').help().parse())

    r.logs.length.should.not.equal(0)
  })

  describe('wrap', () => {
    it('should wrap argument descriptions onto multiple lines', () => {
      const r = checkUsage(() => yargs([])
        .option('fairly-long-option', {
          alias: 'f',
          default: 'fairly-long-default',
          description: 'npm prefix used to locate globally installed npm packages'
        })
        .demand('foo')
        .wrap(50)
        .parse()
      )

      r.errors[0].split('\n').forEach((line, i) => {
        if (!i || !line) return // ignore first and last line.
        line.length.should.lte(50)
      })
    })

    it('should wrap based on window-size if no wrap is provided', function () {
      if (!process.stdout.isTTY) {
        return this.skip()
      }

      const width = process.stdout.columns

      const r = checkUsage(() => yargs([])
        .option('fairly-long-option', {
          alias: 'f',
          // create a giant string that should wrap.
          description: new Array((width + 1) * 5).join('s')
        })
        .demand('foo')
        .parse()
      )

      // the long description should cause several line
      // breaks when wrapped.
      r.errors[0].split('\n').length.should.gte(4)
    })

    it('should not raise an exception when long default and description are provided', () => yargs([])
      .option('fairly-long-option', {
        alias: 'f',
        default: 'npm prefix used to locate globally installed npm packages',
        description: 'npm prefix used to locate globally installed npm packages'
      })
      .wrap(40)
      .help())

    it('should wrap the left-hand-column if it takes up more than 50% of the screen', () => {
      const r = checkUsage(() => yargs([])
        .example(
          'i am a fairly long example',
          'description that is also fairly long'
        )
        .demand('foo')
        .wrap(40)
        .parse()
      )

      // should split example usage onto multiple lines.
      r.errors[0].split('\n').length.should.equal(10)

      // should wrap within appropriate boundaries.
      r.errors[0].split('\n').forEach((line, i) => {
        // ignore headings and blank lines.
        if (!line || line.match('Examples:') || line.match('Options:')) return

        line.length.should.lte(40)
      })
    })

    it('should not wrap left-hand-column if no description is provided', () => {
      const r = checkUsage(() => yargs([])
        .example('i am a fairly long example that is like really long woooo')
        .demand('foo')
        .wrap(50)
        .parse()
      )

      r.errors[0].split('\n').forEach((line, i) => {
        // ignore headings and blank lines.
        if (!line.match('i am a fairly long example')) return

        // with two white space characters on the left,
        // line length should be 50 - 2
        line.length.should.equal(48)
      })
    })

    it('should wrap the usage string', () => {
      const r = checkUsage(() => yargs([])
        .usage('i am a fairly long usage string look at me go.')
        .demand('foo')
        .wrap(20)
        .parse()
      )

      // the long usage string should cause line-breaks.
      r.errors[0].split('\n').length.should.gt(6)
    })

    it('should align span columns when ansi colors are not used in a description', () => {
      const noColorAddedDescr = 'The file to add or remove'

      const r = checkUsage(() => yargs(['-h'])
        .option('f', {
          alias: 'file',
          describe: noColorAddedDescr,
          demand: true,
          type: 'string'
        })
        .help('h').alias('h', 'help')
        .wrap(80)
        .parse()
      )

      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --version   Show version number                                      [boolean]',
        `  -f, --file  ${noColorAddedDescr}                      [string] [required]`,
        '  -h, --help  Show help                                                [boolean]'
      ])
    })

    it('should align span columns when ansi colors are used in a description', () => {
      const yellowDescription = chalk.yellow('The file to add or remove')

      const r = checkUsage(() => yargs(['-h'])
        .option('f', {
          alias: 'file',
          describe: yellowDescription,
          demand: true,
          type: 'string'
        })
        .help('h').alias('h', 'help')
        .wrap(80)
        .parse()
      )

      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --version   Show version number                                      [boolean]',
        `  -f, --file  ${yellowDescription}                      [string] [required]`,
        '  -h, --help  Show help                                                [boolean]'
      ])
    })
  })

  describe('commands', () => {
    it('should output a list of available commands', () => {
      const r = checkUsage(() => yargs('')
        .command('upload', 'upload something')
        .command('download', 'download something from somewhere')
        .demand('y')
        .wrap(null)
        .parse()
      )

      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'usage [command]',
        'Commands:',
        '  usage upload    upload something',
        '  usage download  download something from somewhere',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  -y  [required]',
        'Missing required argument: y'
      ])
    })

    it('should not show hidden commands', () => {
      const r = checkUsage(() => yargs('')
        .command('upload', 'upload something')
        .command('secret', false)
        .demand('y')
        .wrap(null)
        .parse()
      )

      r.errors.join('\n').split(/\s+/).should.deep.equal([
        'usage',
        '[command]',
        'Commands:',
        'usage', 'upload', 'upload', 'something',
        'Options:',
        '--help', 'Show', 'help', '[boolean]',
        '--version', 'Show', 'version', 'number', '[boolean]',
        '-y', '[required]',
        'Missing', 'required', 'argument:', 'y'
      ])
    })

    it('allows completion command to be hidden', () => {
      const r = checkUsage(() => yargs('')
        .command('upload', 'upload something')
        .completion('completion', false)
        .demand('y')
        .wrap(null)
        .parse()
      )

      r.errors.join('\n').split(/\s+/).should.deep.equal([
        'usage',
        '[command]',
        'Commands:',
        'usage', 'upload', 'upload', 'something',
        'Options:',
        '--help', 'Show', 'help', '[boolean]',
        '--version', 'Show', 'version', 'number', '[boolean]',
        '-y', '[required]',
        'Missing', 'required', 'argument:', 'y'
      ])
    })

    it('preserves global wrap() for commands that do not override it', () => {
      const uploadCommand = 'upload <dest>'
      const uploadDesc = 'Upload cwd to remote destination'
      const uploadOpts = {
        force: {
          describe: 'Force overwrite of remote directory contents',
          type: 'boolean'
        }
      }
      const uploadHandler = (argv) => {}

      const generalHelp = checkUsage(() => yargs('--help')
        .command(uploadCommand, uploadDesc, uploadOpts, uploadHandler)
        .wrap(null)
        .parse()
      )
      const commandHelp = checkUsage(() => yargs('upload --help')
        .command(uploadCommand, uploadDesc, uploadOpts, uploadHandler)
        .wrap(null)
        .parse()
      )

      generalHelp.logs[0].split('\n').should.deep.equal([
        'usage [command]',
        '',
        'Commands:',
        '  usage upload <dest>  Upload cwd to remote destination',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
      commandHelp.logs[0].split('\n').should.deep.equal([
        'usage upload <dest>',
        '',
        'Upload cwd to remote destination',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  --force    Force overwrite of remote directory contents  [boolean]'
      ])
    })

    it('allows a command to override global wrap()', () => {
      const uploadCommand = 'upload <dest>'
      const uploadDesc = 'Upload cwd'
      const uploadBuilder = yargs => yargs
        .option('force', {
          describe: 'Force overwrite of remote directory contents',
          type: 'boolean'
        })
        .wrap(46)
      const uploadHandler = argv => {}

      const generalHelp = checkUsage(() => yargs('--help')
        .command(uploadCommand, uploadDesc, uploadBuilder, uploadHandler)
        .wrap(null)
        .parse()
      )
      const commandHelp = checkUsage(() => yargs('upload --help')
        .command(uploadCommand, uploadDesc, uploadBuilder, uploadHandler)
        .wrap(null)
        .parse()
      )

      generalHelp.logs[0].split('\n').should.deep.equal([
        'usage [command]',
        '',
        'Commands:',
        '  usage upload <dest>  Upload cwd',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
      commandHelp.logs[0].split('\n').should.deep.equal([
        'usage upload <dest>',
        '',
        'Upload cwd',
        '',
        'Options:',
        '  --help     Show help               [boolean]',
        '  --version  Show version number     [boolean]',
        '  --force    Force overwrite of remote',
        '             directory contents      [boolean]'
      ])
    })

    it('resets groups for a command handler, respecting order', () => {
      const r = checkUsage(() => yargs(['upload', '-h'])
        .command('upload', 'upload something', yargs => yargs
          .option('q', {
            type: 'boolean',
            group: 'Flags:'
          })
          .help('h').group('h', 'Global Flags:')
          .wrap(null))
        .help('h').group('h', 'Global Flags:')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage upload',
        '',
        'upload something',
        '',
        'Flags:',
        '  -q  [boolean]',
        '',
        'Global Flags:',
        '  -h  Show help  [boolean]',
        '',
        'Options:',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('allows global option to be disabled', () => {
      const r = checkUsage(() => yargs(['upload', '-h'])
        .command('upload', 'upload something', yargs => yargs
          .option('q', {
            type: 'boolean',
            group: 'Flags:'
          })
          .wrap(null))
        .option('i', {
          type: 'boolean',
          global: true,
          group: 'Awesome Flags:'
        })
        .option('j', {
          type: 'boolean',
          global: false, // not global so not preserved, even though the group is
          group: 'Awesome Flags:'
        })
        .help('h')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage upload',
        '',
        'upload something',
        '',
        'Flags:',
        '  -q  [boolean]',
        '',
        'Awesome Flags:',
        '  -i  [boolean]',
        '',
        'Options:',
        '  --version  Show version number  [boolean]',
        '  -h         Show help  [boolean]'
      ])
    })

    it('can add to preserved groups', () => {
      const r = checkUsage(() => yargs(['upload', '-h'])
        .command('upload', 'upload something', yargs => yargs
          .option('q', {
            type: 'boolean',
            group: 'Awesome Flags:'
          })
          .wrap(null))
        .option('i', {
          type: 'boolean',
          global: true,
          group: 'Awesome Flags:'
        })
        .help('h')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage upload',
        '',
        'upload something',
        '',
        'Awesome Flags:',
        '  -i  [boolean]',
        '  -q  [boolean]',
        '',
        'Options:',
        '  --version  Show version number  [boolean]',
        '  -h         Show help  [boolean]'
      ])
    })

    it('can bump up preserved groups', () => {
      const r = checkUsage(() => yargs(['upload', '-h'])
        .command('upload', 'upload something', yargs => yargs
          .group([], 'Awesome Flags:')
          .option('q', {
            type: 'boolean',
            group: 'Flags:'
          })
          .wrap(null))
        .option('i', {
          type: 'boolean',
          global: true,
          group: 'Awesome Flags:'
        })
        .option('j', {
          type: 'boolean',
          global: false, // not global so not preserved, even though the group is
          group: 'Awesome Flags:'
        })
        .help('h')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage upload',
        '',
        'upload something',
        '',
        'Awesome Flags:',
        '  -i  [boolean]',
        '',
        'Flags:',
        '  -q  [boolean]',
        '',
        'Options:',
        '  --version  Show version number  [boolean]',
        '  -h         Show help  [boolean]'
      ])
    })

    it('should display global non empty groups for commands', () => {
      const r = checkUsage(() => yargs(['upload', '-h'])
        .command('upload', 'upload something', yargs => yargs
          .option('q', {
            type: 'boolean'
          })
          .wrap(null))
        .option('i', {
          type: 'boolean',
          global: true
        })
        .option('j', {
          type: 'boolean',
          global: false // not global so not preserved, even though the group is
        })
        .group(['i', 'j'], 'Awesome Flags:')
        .help('h')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage upload',
        '',
        'upload something',
        '',
        'Awesome Flags:',
        '  -i  [boolean]',
        '',
        'Options:',
        '  --version  Show version number  [boolean]',
        '  -h         Show help  [boolean]',
        '  -q  [boolean]'
      ])
    })

    it('should display global non empty groups for subcommands', () => {
      const r = checkUsage(() => yargs(['do', 'upload', '-h'])
        .command('do', 'do something', yargs => yargs
          .command('upload', 'upload something', yargs => yargs
            .option('q', {
              type: 'boolean'
            })
            .wrap(null))
          .wrap(null))
        .option('i', {
          type: 'boolean',
          global: true
        })
        .option('j', {
          type: 'boolean',
          global: false // not global so not preserved, even though the group is
        })
        .group(['i', 'j'], 'Awesome Flags:')
        .help('h')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage do upload',
        '',
        'upload something',
        '',
        'Awesome Flags:',
        '  -i  [boolean]',
        '',
        'Options:',
        '  --version  Show version number  [boolean]',
        '  -h         Show help  [boolean]',
        '  -q  [boolean]'
      ])
    })

    it('should list a module command only once', () => {
      const r = checkUsage(() => yargs('--help')
        .command('upload', 'upload something', {
          builder (yargs) {
            return yargs
          },
          handler (argv) {}
        })
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage [command]',
        '',
        'Commands:',
        '  usage upload  upload something',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('allows a builder function to override default usage() string', () => {
      const r = checkUsage(() => yargs('upload --help')
        .command('upload', 'upload something', {
          builder (yargs) {
            return yargs.usage('Usage: program upload <something> [opts]').demand(1)
          },
          handler (argv) {}
        })
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Usage: program upload <something> [opts]',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('allows a builder function to disable default usage() with null', () => {
      const r = checkUsage(() => yargs('upload --help')
        .command('upload', 'upload something', yargs => yargs.usage(null), (argv) => {})
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('displays given command chain with positional args in default usage for subcommand with builder object', () => {
      const r = checkUsage(() => yargs('one two --help')
        .command('one <sub>', 'level one, requires subcommand', yargs => yargs.command('two [next]', 'level two', {}, (argv) => {}), (argv) => {})
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage one two [next]',
        '',
        'level two',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('displays given command chain with positional args in default usage for subcommand with builder function', () => {
      const r = checkUsage(() => yargs('one two --help')
        .command('one <sub>', 'level one, requires subcommand', yargs => yargs.command('two [next]', 'level two', yargs => yargs, (argv) => {}), (argv) => {})
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage one two [next]',
        '',
        'level two',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('displays aliases for commands that have them (no wrap)', () => {
      const r = checkUsage(() => yargs('help')
        .command(['copy <src> [dest]', 'cp', 'dupe'], 'Copy something')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage [command]',
        '',
        'Commands:',
        '  usage copy <src> [dest]  Copy something  [aliases: cp, dupe]',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('displays aliases for commands that have them (with wrap)', () => {
      const r = checkUsage(() => yargs('help')
        .command(['copy <src> [dest]', 'cp', 'dupe'], 'Copy something')
        .wrap(80)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage [command]',
        '',
        'Commands:',
        '  usage copy <src> [dest]  Copy something                    [aliases: cp, dupe]',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })

    it('allows a builder to add more than one usage with mutiple usage calls', () => {
      const r = checkUsage(() => yargs('upload --help')
        .command('upload', 'upload something', yargs => yargs.usage('$0 upload [something]').usage('$0 upload [something else]'), (argv) => {})
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage upload [something]',
        'usage upload [something else]',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('allows a builder to disable usage with null after mutiple usage calls', () => {
      const r = checkUsage(() => yargs('upload --help')
        .command('upload', 'upload something', yargs => yargs.usage('$0 upload [something]').usage('$0 upload [something else]').usage(null), (argv) => {})
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('does not display $0 twice when default commands are enabled', () => {
      const r = checkUsage(() => yargs('-h')
        .usage('$0', 'do something', yargs => {
          yargs
            .alias('h', 'help')
        })
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage',
        '',
        'do something',
        '',
        'Options:',
        '  --version   Show version number  [boolean]',
        '  -h, --help  Show help  [boolean]'
      ])
    })
  })

  describe('epilogue', () => {
    it('should display an epilog message at the end of the usage instructions', () => {
      const r = checkUsage(() => yargs('')
        .epilog('for more info view the manual at http://example.com')
        .demand('y')
        .wrap(null)
        .parse()
      )

      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  -y  [required]',
        'for more info view the manual at http://example.com',
        'Missing required argument: y'
      ])
    })

    it('supports multiple epilogs', () => {
      const r = checkUsage(() => yargs('')
        .epilog('for more info view the manual at http://example.com')
        .epilog('you can also find us on slack at http://devtoolscommunity.herokuapp.com')
        .epilog('keep up to date by reading our blog at http://yargs.js.org/blog.html')
        .demand('y')
        .wrap(null)
        .parse()
      )

      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  -y  [required]',
        'for more info view the manual at http://example.com',
        'you can also find us on slack at http://devtoolscommunity.herokuapp.com',
        'keep up to date by reading our blog at http://yargs.js.org/blog.html',
        'Missing required argument: y'
      ])
    })

    it('replaces $0 in epilog string', () => {
      const r = checkUsage(() => yargs('')
        .epilog("Try '$0 --long-help' for more information")
        .demand('y')
        .wrap(null)
        .parse()
      )

      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  -y  [required]',
        'Try \'usage --long-help\' for more information',
        'Missing required argument: y'
      ])
    })
  })

  describe('default', () => {
    it('should indicate that the default is a generated-value, if function is provided', () => {
      const r = checkUsage(() => yargs(['-h'])
        .help('h')
        .default('f', () => 99)
        .wrap(null)
        .parse()
      )

      r.logs[0].should.include('default: (generated-value)')
    })

    it('if a named function is provided, should use name rather than (generated-value)', () => {
      const r = checkUsage(() => yargs(['-h'])
        .help('h')
        .default('f', function randomNumber () {
          return Math.random() * 256
        })
        .wrap(null)
        .parse()
      )

      r.logs[0].should.include('default: (random-number)')
    })

    it('default-description take precedence if one is provided', () => {
      const r = checkUsage(() => yargs(['-h'])
        .help('h')
        .default('f', function randomNumber () {
          return Math.random() * 256
        }, 'foo-description')
        .wrap(null)
        .parse()
      )

      r.logs[0].should.include('default: foo-description')
    })

    it('serializes object and array defaults', () => {
      const r = checkUsage(() => yargs(['-h'])
        .help('h')
        .default('a', [])
        .default('a2', [3])
        .default('o', { a: '33' })
        .wrap(null)
        .parse()
      )

      r.logs[0].should.include('default: []')
      r.logs[0].should.include('default: {"a":"33"}')
      r.logs[0].should.include('default: [3]')
    })
  })

  describe('defaultDescription', () => {
    describe('using option() without default()', () => {
      it('should output given desc with default value', () => {
        const r = checkUsage(() => yargs(['-h'])
          .help('h')
          .option('port', {
            describe: 'The port value for URL',
            defaultDescription: '80 for HTTP and 443 for HTTPS',
            default: 80
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: 80 for HTTP and 443 for HTTPS')
      })

      it('should output given desc without default value', () => {
        const r = checkUsage(() => yargs(['-h'])
          .help('h')
          .option('port', {
            describe: 'The port value for URL',
            defaultDescription: '80 for HTTP and 443 for HTTPS'
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: 80 for HTTP and 443 for HTTPS')
      })

      it('should prefer given desc over function desc', () => {
        const r = checkUsage(() => yargs(['-h'])
          .help('h')
          .option('port', {
            describe: 'The port value for URL',
            defaultDescription: '80 for HTTP and 443 for HTTPS',
            default: function determinePort () {
              return 80
            }
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: 80 for HTTP and 443 for HTTPS')
      })
    })

    describe('using option() with default()', () => {
      it('should prefer default() desc when given last', () => {
        const r = checkUsage(() => yargs(['-h'])
          .help('h')
          .option('port', {
            describe: 'The port value for URL',
            defaultDescription: 'depends on protocol'
          })
          .default('port', null, '80 for HTTP and 443 for HTTPS')
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: 80 for HTTP and 443 for HTTPS')
      })

      it('should prefer option() desc when given last', () => {
        const r = checkUsage(() => yargs(['-h'])
          .help('h')
          .default('port', null, '80 for HTTP and 443 for HTTPS')
          .option('port', {
            describe: 'The port value for URL',
            defaultDescription: 'depends on protocol'
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: depends on protocol')
      })

      it('should prefer option() desc over default() function', () => {
        const r = checkUsage(() => yargs(['-h'])
          .help('h')
          .option('port', {
            describe: 'The port value for URL',
            defaultDescription: '80 for HTTP and 443 for HTTPS'
          })
          .default('port', function determinePort () {
            return 80
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: 80 for HTTP and 443 for HTTPS')
      })
    })

    describe('using positional() without default()', () => {
      it('should output given desc with default value', () => {
        const r = checkUsage(() => yargs(['url', '-h'])
          .help('h')
          .command('url', 'Print a URL', (yargs) => {
            yargs.positional('port', {
              describe: 'The port value for URL',
              defaultDescription: '80 for HTTP and 443 for HTTPS',
              default: 80
            })
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: 80 for HTTP and 443 for HTTPS')
      })

      it('should output given desc without default value', () => {
        const r = checkUsage(() => yargs(['url', '-h'])
          .help('h')
          .command('url', 'Print a URL', (yargs) => {
            yargs.positional('port', {
              describe: 'The port value for URL',
              defaultDescription: '80 for HTTP and 443 for HTTPS'
            })
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: 80 for HTTP and 443 for HTTPS')
      })

      it('should prefer given desc over function desc', () => {
        const r = checkUsage(() => yargs(['url', '-h'])
          .help('h')
          .command('url', 'Print a URL', (yargs) => {
            yargs.positional('port', {
              describe: 'The port value for URL',
              defaultDescription: '80 for HTTP and 443 for HTTPS',
              default: function determinePort () {
                return 80
              }
            })
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: 80 for HTTP and 443 for HTTPS')
      })
    })

    describe('using positional() with default()', () => {
      it('should prefer default() desc when given last', () => {
        const r = checkUsage(() => yargs(['url', '-h'])
          .help('h')
          .command('url', 'Print a URL', (yargs) => {
            yargs
              .positional('port', {
                describe: 'The port value for URL',
                defaultDescription: 'depends on protocol'
              })
              .default('port', null, '80 for HTTP and 443 for HTTPS')
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: 80 for HTTP and 443 for HTTPS')
      })

      it('should prefer positional() desc when given last', () => {
        const r = checkUsage(() => yargs(['url', '-h'])
          .help('h')
          .command('url', 'Print a URL', (yargs) => {
            yargs
              .default('port', null, '80 for HTTP and 443 for HTTPS')
              .positional('port', {
                describe: 'The port value for URL',
                defaultDescription: 'depends on protocol'
              })
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: depends on protocol')
      })

      it('should prefer positional() desc over default() function', () => {
        const r = checkUsage(() => yargs(['url', '-h'])
          .help('h')
          .command('url', 'Print a URL', (yargs) => {
            yargs
              .positional('port', {
                describe: 'The port value for URL',
                defaultDescription: '80 for HTTP and 443 for HTTPS'
              })
              .default('port', function determinePort () {
                return 80
              })
          })
          .wrap(null)
          .parse()
        )

        r.logs[0].should.include('default: 80 for HTTP and 443 for HTTPS')
      })
    })
  })

  describe('normalizeAliases', () => {
    // see #128
    it("should display 'description' string in help message if set for alias", () => {
      const r = checkUsage(() => yargs(['-h'])
        .describe('foo', 'foo option')
        .alias('f', 'foo')
        .help('h')
        .wrap(null)
        .parse()
      )

      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --version  Show version number  [boolean]',
        '  -h         Show help  [boolean]',
        '  -f, --foo  foo option'
      ])
    })

    it("should display 'required' string in help message if set for alias", () => {
      const r = checkUsage(() => yargs(['-h'])
        .demand('foo')
        .alias('f', 'foo')
        .help('h')
        .wrap(null)
        .parse()
      )

      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --version  Show version number  [boolean]',
        '  -h         Show help  [boolean]',
        '  -f, --foo  [required]'
      ])
    })

    it("should display 'type' string in help message if set for alias", () => {
      const r = checkUsage(() => yargs(['-h'])
        .string('foo')
        .describe('foo', 'bar')
        .alias('f', 'foo')
        .help('h')
        .wrap(null)
        .parse()
      )

      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --version  Show version number  [boolean]',
        '  -h         Show help  [boolean]',
        '  -f, --foo  bar  [string]'
      ])
    })

    it("should display 'type' number in help message if set for alias", () => {
      const r = checkUsage(() => yargs(['-h'])
        .string('foo')
        .describe('foo', 'bar')
        .alias('f', 'foo')
        .number(['foo'])
        .help('h')
        .wrap(null)
        .parse()
      )

      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --version  Show version number  [boolean]',
        '  -h         Show help  [boolean]',
        '  -f, --foo  bar  [number]'
      ])
    })
  })

  describe('showHelp', () => {
    // see #143.
    it('should show help regardless of whether argv has been called', () => {
      const r = checkUsage(() => {
        const y = yargs(['--foo'])
          .options('foo', {
            alias: 'f',
            describe: 'foo option'
          })
          .wrap(null)

        y.showHelp()
      })

      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  --foo, -f  foo option'
      ])
    })

    it('should print the help using console.error when no arguments were specified', () => {
      const r = checkUsage(() => {
        const y = yargs(['--foo'])
          .options('foo', {
            alias: 'f',
            describe: 'foo option'
          })
          .wrap(null)

        y.showHelp()
      })

      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  --foo, -f  foo option'
      ])
    })

    it('should call the correct console.log method when specified', () => {
      const r = checkUsage(() => {
        const y = yargs(['--foo'])
          .options('foo', {
            alias: 'f',
            describe: 'foo option'
          })
          .wrap(null)

        y.showHelp('log')
      })

      r.errors.length.should.eql(0)
      r.logs.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '  --foo, -f  foo option'
      ])
    })

    it('should call the callback to print when specified', (done) => {
      const y = yargs(['--foo'])
        .options('foo', {
          alias: 'f',
          describe: 'foo option'
        })
        .wrap(null)

      y.showHelp(printCallback)
      function printCallback (msg) {
        msg.split(/\n+/).should.deep.equal([
          'Options:',
          '  --help     Show help  [boolean]',
          '  --version  Show version number  [boolean]',
          '  --foo, -f  foo option'
        ])
        return done()
      }
    })
  })

  describe('$0', () => {
    function mockProcessArgv (argv, cb) {
      const argvOld = process.argv
      process.argv = argv
      // cb must be sync for now
      try {
        cb()
        process.argv = argvOld
      } catch (err) {
        process.argv = argvOld
        throw err
      }
    }

    it('is detected correctly for a basic script', () => {
      mockProcessArgv(['script.js'], () => {
        yargs([]).$0.should.equal('script.js')
      })
    })

    it('is detected correctly when argv contains "node"', () => {
      mockProcessArgv(['node', 'script.js'], () => {
        yargs([]).$0.should.equal('script.js')
      })
    })

    it('is detected correctly when dirname contains "node"', () => {
      mockProcessArgv(['/code/node/script.js'], () => {
        yargs([]).$0.should.equal('/code/node/script.js')
      })
    })

    it('is detected correctly when dirname and argv contain "node"', () => {
      mockProcessArgv(['node', '/code/node/script.js'], () => {
        yargs([]).$0.should.equal('/code/node/script.js')
      })
    })

    it('is detected correctly when argv contains "iojs"', () => {
      mockProcessArgv(['iojs', 'script.js'], () => {
        yargs([]).$0.should.equal('script.js')
      })
    })

    it('is detected correctly when dirname contains "iojs"', () => {
      mockProcessArgv(['/code/iojs/script.js'], () => {
        yargs([]).$0.should.equal('/code/iojs/script.js')
      })
    })

    it('is detected correctly when dirname and argv contain "iojs"', () => {
      mockProcessArgv(['iojs', '/code/iojs/script.js'], () => {
        yargs([]).$0.should.equal('/code/iojs/script.js')
      })
    })

    it('is detected correctly when argv contains "node.exe"', () => {
      mockProcessArgv(['node.exe', 'script.js'], () => {
        yargs([]).$0.should.equal('script.js')
      })
    })

    it('is detected correctly when argv contains "iojs.exe"', () => {
      mockProcessArgv(['iojs.exe', 'script.js'], () => {
        yargs([]).$0.should.equal('script.js')
      })
    })

    if (process.platform !== 'win32') {
      it('is resolved to the relative path if it is shorter', () => {
        mockProcessArgv(['node', '/code/node/script.js'], () => {
          yargs([], '/code/python/').$0.should.equal('../node/script.js')
        })
      })

      it('is not resolved to the relative path if it is larger', () => {
        mockProcessArgv(['node', '/script.js'], () => {
          yargs([], '/very/long/current/directory/').$0.should.equal('/script.js')
        })
      })
    }

    if (process.platform === 'win32') {
      it('is resolved to the relative path if it is shorter, using Windows paths', () => {
        mockProcessArgv(['node.exe', 'C:\\code\\node\\script.js'], () => {
          yargs([], 'C:\\code\\python\\').$0.should.equal('..\\node\\script.js')
        })
      })

      it('is not resolved to the relative path if it is larger, using Windows paths', () => {
        mockProcessArgv(['node', 'C:\\script.js'], () => {
          yargs([], 'C:\\very\\long\\current\\directory\\').$0.should.equal('C:\\script.js')
        })
      })
    }
  })

  describe('choices', () => {
    it('should output choices when defined for non-hidden options', () => {
      const r = checkUsage(() => yargs(['--help'])
        .option('answer', {
          describe: 'does this look good?',
          choices: ['yes', 'no', 'maybe']
        })
        .option('confidence', {
          describe: 'percentage of confidence',
          choices: [0, 25, 50, 75, 100]
        })
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  --help        Show help  [boolean]',
        '  --version     Show version number  [boolean]',
        '  --answer      does this look good?  [choices: "yes", "no", "maybe"]',
        '  --confidence  percentage of confidence  [choices: 0, 25, 50, 75, 100]'
      ])
    })

    it('should not output choices when defined for hidden options', () => {
      const r = checkUsage(() => yargs(['--help'])
        .option('answer', {
          type: 'string',
          choices: ['yes', 'no', 'maybe'],
          hidden: true
        })
        .option('confidence', {
          choices: [0, 25, 50, 75, 100],
          hidden: true
        })
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })
  })

  describe('count', () => {
    it('should indicate when an option is a count', () => {
      const r = checkUsage(() => yargs(['--help'])
        .option('verbose', {
          describe: 'verbose level',
          count: true
        })
        .help('help')
        .wrap(null)
        .parse()
      )

      r.logs.join(' ').should.match(/\[count]/)
    })
  })

  describe('array', () => {
    it('should indicate when an option is an array', () => {
      const r = checkUsage(() => yargs(['--help'])
        .option('arr', {
          describe: 'array option',
          array: true
        })
        .help('help')
        .wrap(null)
        .parse()
      )

      r.logs.join(' ').should.match(/\[array]/)
    })
  })

  describe('group', () => {
    it('allows an an option to be placed in an alternative group', () => {
      const r = checkUsage(() => yargs(['--help'])
        .option('batman', {
          type: 'string',
          describe: "not the world's happiest guy",
          default: 'Bruce Wayne'
        })
        .group('batman', 'Heroes:')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Heroes:',
        "  --batman  not the world's happiest guy  [string] [default: \"Bruce Wayne\"]",
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it("does not print the 'Options:' group if no keys are in it", () => {
      const r = checkUsage(() => yargs(['-h'])
        .string('batman')
        .describe('batman', "not the world's happiest guy")
        .default('batman', 'Bruce Wayne')
        .group('batman', 'Heroes:')
        .group('h', 'Heroes:')
        .help('h')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Heroes:',
        "  --batman  not the world's happiest guy  [string] [default: \"Bruce Wayne\"]",
        '  -h        Show help  [boolean]',
        '',
        'Options:',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('displays alias keys appropriately within a grouping', () => {
      const r = checkUsage(() => yargs(['-h'])
        .alias('h', 'help')
        .group('help', 'Magic Variable:')
        .group('version', 'Magic Variable:')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Magic Variable:',
        '  -h, --help  Show help  [boolean]',
        '  --version   Show version number  [boolean]'
      ])
    })

    it('allows a group to be provided as the only information about an option', () => {
      const r = checkUsage(() => yargs(['--help'])
        .group('batman', 'Heroes:')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Heroes:',
        '  --batman',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })

    it('allows multiple options to be grouped at the same time', () => {
      const r = checkUsage(() => yargs(['-h'])
        .help('h')
        .group('h', 'Options:')
        .group(['batman', 'robin'], 'Heroes:')
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  -h         Show help  [boolean]',
        '  --version  Show version number  [boolean]',
        '',
        'Heroes:',
        '  --batman',
        '  --robin'
      ])
    })

    it('allows group to be provided in the options object', () => {
      const r = checkUsage(() => yargs(['-h'])
        .help('h')
        .option('batman', {
          group: 'Heroes:',
          string: true
        })
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Heroes:',
        '  --batman  [string]',
        '',
        'Options:',
        '  --version  Show version number  [boolean]',
        '  -h         Show help  [boolean]'
      ])
    })

    it('only displays a duplicated option once per group', () => {
      const r = checkUsage(() => yargs(['--help'])
        .group(['batman', 'batman'], 'Heroes:')
        .group('robin', 'Heroes:')
        .option('robin', {
          group: 'Heroes:'
        })
        .wrap(null)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Heroes:',
        '  --batman',
        '  --robin',
        '',
        'Options:',
        '  --help     Show help  [boolean]',
        '  --version  Show version number  [boolean]'
      ])
    })
  })

  describe('cjk', () => {
    it('should calculate width of cjk text correctly', () => {
      const r = checkUsage(() => {
        const y = yargs()
          .example('안녕하세요 선생님 안녕 친구야', '인사하는 어린이 착한 어린이')
          .wrap(80)

        y.showHelp()
      })

      r.errors.join('\n').split(/\n+/).should.deep.equal([
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]',
        'Examples:',
        '  안녕하세요 선생님 안녕 친구야  인사하는 어린이 착한 어린이'
      ])
    })
  })

  describe('default command', () => {
    it('should display top-level help with no command given', () => {
      const r = checkUsage(() => yargs('--help')
        .command(['list [pattern]', 'ls', '*'], 'List key-value pairs for pattern', {}, noop)
        .command('get <key>', 'Get value for key', {}, noop)
        .command('set <key> [value]', 'Set value for key', {}, noop)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage [pattern]',
        '',
        'List key-value pairs for pattern',
        '',
        'Commands:',
        '  usage list [pattern]     List key-value pairs for pattern',
        '                                                         [default] [aliases: ls]',
        '  usage get <key>          Get value for key',
        '  usage set <key> [value]  Set value for key',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })

    it('should display top-level help with sorting with no command given if sorting enabled', () => {
      const r = checkUsage(() => yargs('--help')
        .command(['list [pattern]', 'ls', '*'], 'List key-value pairs for pattern', {}, noop)
        .command('get <key>', 'Get value for key', {}, noop)
        .command('set <key> [value]', 'Set value for key', {}, noop)
        .parserConfiguration({ 'sort-commands': true })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage [pattern]',
        '',
        'List key-value pairs for pattern',
        '',
        'Commands:',
        '  usage get <key>          Get value for key',
        '  usage list [pattern]     List key-value pairs for pattern',
        '                                                         [default] [aliases: ls]',
        '  usage set <key> [value]  Set value for key',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })

    it('should display default command as ./$0 if it has no aliases', () => {
      const r = checkUsage(() => yargs('--help')
        .command('* [pattern]', 'List key-value pairs for pattern', {}, noop)
        .command('get <key>', 'Get value for key', {}, noop)
        .command('set <key> [value]', 'Set value for key', {}, noop)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage [pattern]',
        '',
        'List key-value pairs for pattern',
        '',
        'Commands:',
        '  usage [pattern]          List key-value pairs for pattern            [default]',
        '  usage get <key>          Get value for key',
        '  usage set <key> [value]  Set value for key',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })

    it('should display positionals that have been configured', () => {
      const r = checkUsage(() => yargs('--help')
        .command('* [pattern]', 'List key-value pairs for pattern', (yargs) => {
          yargs.positional('pattern', {
            type: 'string',
            default: '.*'
          })
        }, noop)
        .command('get <key>', 'Get value for key', {}, noop)
        .command('set <key> [value]', 'Set value for key', {}, noop)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage [pattern]',
        '',
        'List key-value pairs for pattern',
        '',
        'Commands:',
        '  usage [pattern]          List key-value pairs for pattern            [default]',
        '  usage get <key>          Get value for key',
        '  usage set <key> [value]  Set value for key',
        '',
        'Positionals:',
        '  pattern                                               [string] [default: ".*"]',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })

    it('should display options that have been configured', () => {
      const r = checkUsage(() => yargs('--help')
        .command('* [pattern]', 'List key-value pairs for pattern', { uuid: { required: true } }, noop)
        .command('get <key>', 'Get value for key', {}, noop)
        .command('set <key> [value]', 'Set value for key', {}, noop)
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage [pattern]',
        '',
        'List key-value pairs for pattern',
        '',
        'Commands:',
        '  usage [pattern]          List key-value pairs for pattern            [default]',
        '  usage get <key>          Get value for key',
        '  usage set <key> [value]  Set value for key',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]',
        '  --uuid                                                              [required]'
      ])
    })
  })

  describe('positional', () => {
    it('should display help section for positionals', () => {
      const r = checkUsage(() => yargs('--help list')
        .command('list [pattern]', 'List key-value pairs for pattern', (yargs) => {
          yargs.positional('pattern', {
            describe: 'the pattern to list keys for'
          })
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage list [pattern]',
        '',
        'List key-value pairs for pattern',
        '',
        'Positionals:',
        '  pattern  the pattern to list keys for',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })

    it('shows that variadic positional arguments are arrays', () => {
      const r = checkUsage(() => yargs('--help list')
        .command('list [pattern...]', 'List key-value pairs for pattern', (yargs) => {
          yargs.positional('pattern', {
            describe: 'the pattern to list keys for'
          })
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage list [pattern...]',
        '',
        'List key-value pairs for pattern',
        '',
        'Positionals:',
        '  pattern  the pattern to list keys for                    [array] [default: []]',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })

    it('indicates that <foo> positional arguments are required', () => {
      const r = checkUsage(() => yargs('--help list')
        .command('list <pattern>', 'List key-value pairs for pattern', (yargs) => {
          yargs.positional('pattern', {
            describe: 'the pattern to list keys for'
          })
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage list <pattern>',
        '',
        'List key-value pairs for pattern',
        '',
        'Positionals:',
        '  pattern  the pattern to list keys for                               [required]',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })

    it('displays aliases appropriately', () => {
      const r = checkUsage(() => yargs('--help list')
        .command('list [pattern|thingy]', 'List key-value pairs for pattern', (yargs) => {
          yargs.positional('pattern', {
            describe: 'the pattern to list keys for'
          })
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage list [pattern|thingy]',
        '',
        'List key-value pairs for pattern',
        '',
        'Positionals:',
        '  pattern, thingy  the pattern to list keys for',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })

    it('displays type information', () => {
      const r = checkUsage(() => yargs('--help list')
        .command('list [pattern]', 'List key-value pairs for pattern', (yargs) => {
          yargs.positional('pattern', {
            describe: 'the pattern to list keys for',
            type: 'string'
          })
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage list [pattern]',
        '',
        'List key-value pairs for pattern',
        '',
        'Positionals:',
        '  pattern  the pattern to list keys for                                 [string]',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })

    it('displays choices array', () => {
      const r = checkUsage(() => yargs('--help list')
        .command('list [pattern]', 'List key-value pairs for pattern', (yargs) => {
          yargs.positional('pattern', {
            describe: 'the pattern to list keys for',
            choices: ['foo', 'bar']
          })
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'usage list [pattern]',
        '',
        'List key-value pairs for pattern',
        '',
        'Positionals:',
        '  pattern  the pattern to list keys for                  [choices: "foo", "bar"]',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]'
      ])
    })
  })

  describe('hidden options', () => {
    it('--help should display all options except for hidden ones', () => {
      const r = checkUsage(() => yargs('--help')
        .options({
          foo: {
            describe: 'FOO'
          },
          bar: {},
          baz: {
            describe: 'BAZ',
            hidden: true
          }
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]',
        '  --foo      FOO',
        '  --bar'
      ])
    })
    it('--help should display all options except for hidden ones even with a default', () => {
      const r = checkUsage(() => yargs('--help')
        .options({
          foo: {
            describe: 'FOO',
            hidden: true
          },
          bar: {},
          baz: {
            type: 'number',
            describe: 'BAZ',
            default: 1,
            hidden: true
          }
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]',
        '  --bar'
      ])
    })
    it('--help should display all options except for hidden ones even in a group', () => {
      const r = checkUsage(() => yargs('--help')
        .options({
          foo: {
            describe: 'FOO',
            hidden: true
          },
          bar: {},
          baz: {
            describe: 'BAZ',
            group: 'Hidden:',
            hidden: true
          }
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]',
        '  --bar'
      ])
    })
    it('--help should display all groups except for ones with only hidden options', () => {
      const r = checkUsage(() => yargs('--help')
        .options({
          foo: {
            describe: 'FOO',
            group: 'Hidden:',
            hidden: true
          },
          bar: {},
          baz: {
            describe: 'BAZ',
            group: 'Hidden:',
            hidden: true
          },
          qux: {
            group: 'Shown:'
          }
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Shown:',
        '  --qux',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]',
        '  --bar'
      ])
    })
    it('--help should display all options (including hidden ones) with --show-hidden', () => {
      const r = checkUsage(() => yargs('--help --show-hidden --mama ama')
        .options({
          foo: {
            describe: 'FOO'
          },
          bar: {},
          baz: {
            describe: 'BAZ',
            hidden: true
          }
        })
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]',
        '  --foo      FOO',
        '  --bar',
        '  --baz      BAZ'
      ])
    })
    it('--help should display all groups (including ones with only hidden options) with --show-hidden', () => {
      const r = checkUsage(() => yargs('--help --show-hidden')
        .options({
          foo: {
            describe: 'FOO',
            group: 'Hidden:',
            hidden: true
          },
          bar: {},
          baz: {
            describe: 'BAZ',
            group: 'Hidden:',
            hidden: true
          },
          qux: {
            group: 'Shown:'
          }
        })
        .argv
      )

      r.logs[0].split('\n').should.deep.equal([
        'Hidden:',
        '  --foo  FOO',
        '  --baz  BAZ',
        '',
        'Shown:',
        '  --qux',
        '',
        'Options:',
        '  --help     Show help                                                 [boolean]',
        '  --version  Show version number                                       [boolean]',
        '  --bar'
      ])
    })
    it('--help should display --custom-show-hidden', () => {
      const r = checkUsage(() => yargs('--help')
        .options({
          foo: {
            describe: 'FOO'
          },
          bar: {},
          baz: {
            describe: 'BAZ',
            hidden: true
          }
        })
        .showHidden('custom-show-hidden')
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  --help                Show help                                      [boolean]',
        '  --version             Show version number                            [boolean]',
        '  --foo                 FOO',
        '  --bar',
        '  --custom-show-hidden  Show hidden options                            [boolean]'
      ])
    })
    it('--help should display all options with --custom-show-hidden', () => {
      const r = checkUsage(() => yargs('--help --custom-show-hidden')
        .options({
          foo: {
            describe: 'FOO'
          },
          bar: {},
          baz: {
            describe: 'BAZ',
            hidden: true
          }
        })
        .showHidden('custom-show-hidden')
        .parse()
      )

      r.logs[0].split('\n').should.deep.equal([
        'Options:',
        '  --help                Show help                                      [boolean]',
        '  --version             Show version number                            [boolean]',
        '  --foo                 FOO',
        '  --bar',
        '  --baz                 BAZ',
        '  --custom-show-hidden  Show hidden options                            [boolean]'
      ])
    })
  })

  describe('help message caching', () => {
    it('should display proper usage when an async handler fails', (done) => {
      const y = yargs()
        .command('cmd', 'test command', {}, () => {
          return new Promise((resolve, reject) =>
            setTimeout(reject, 10)
          )
        })
        .exitProcess(false)

      checkUsage(
        () => {
          y.parse('cmd')
          setTimeout(() => process.exit(1), 100)
        },
        undefined,
        (err, r) => {
          should.not.exist(err)
          should.exist(r.errors[0])
          r.errors[0].split('\n').should.deep.equal([
            'mocha cmd',
            '',
            'test command',
            '',
            'Options:',
            '  --help     Show help                                                 [boolean]',
            '  --version  Show version number                                       [boolean]'
          ])
          done()
        }
      )
    })

    it('should not display a cached help message for the next parsing', (done) => {
      const y = yargs()
        .command('cmd', 'test command', {}, () => {
          return new Promise((resolve, reject) =>
            setTimeout(resolve, 10)
          )
        })
        .demandCommand(1, 'You need at least one command before moving on')
        .exitProcess(false)

      checkUsage(
        () => {
          y.parse('cmd')
          setTimeout(() => {
            y.parse('')
            setTimeout(() => process.exit(1), 100)
          }, 100)
        },
        undefined,
        (err, r) => {
          should.exist(err)
          err.message.should.equal('You need at least one command before moving on')
          should.exist(r.errors[0])
          r.errors[0].split('\n').should.deep.equal([
            'mocha <command>',
            '',
            'Commands:',
            '  mocha cmd  test command',
            '',
            'Options:',
            '  --help     Show help                                                 [boolean]',
            '  --version  Show version number                                       [boolean]'
          ])
          done()
        }
      )
    })
  })

  it('should allow setting the same description for several keys', () => {
    const r = checkUsage(() => yargs('--help')
      .describe(['big', 'small'], 'Packet size')
      .parse()
    )

    r.logs[0].split('\n').should.deep.equal([
      'Options:',
      '  --help     Show help                                                 [boolean]',
      '  --version  Show version number                                       [boolean]',
      '  --big      Packet size',
      '  --small    Packet size'
    ])
  })
})