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ristretto.js
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ristretto.js
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/*global window */
(function (global) {
'use strict';
function AssertionError(message) {
this.name = 'AssertionError';
this.message = message || '';
}
AssertionError.prototype = new Error();
AssertionError.prototype.constructor = AssertionError;
var deepEqual = (function () {
var _toString = Object.prototype.toString;
var hasOwn = Object.prototype.hasOwnProperty;
var getProto = Object.getPrototypeOf || function (a) {
/*jshint proto: true, camelcase: false, eqnull: true */
// es5-shim has a decent shim for this
if (a == null) {
throw new TypeError('getPrototypeOf: '+ a + ' is not an Object');
}
return ('__proto__' in a) ? a.__proto__ : Object.prototype;
};
function type (a) {
/*jshint eqnull: true */
return a == null ? String(a) :
_toString.call(a).slice(8, -1);
}
function isArray (a) {
return type(a) === 'Array';
}
function isObject (a) {
return type(a) === 'Object';
}
function isDate (a) {
return type(a) === 'Date';
}
function arraysEqual (a, b) {
// if arrays a and b have the same length
// and all indexes a[i] `deepEqual` b[i] then
/// a `deepEqual` b
if (a.length !== b.length) {
return false;
}
var i = a.length;
while (i--) {
if (!deepEqual(a[i], b[i])) {
return false;
}
}
return true;
}
function objectsEqual (a, b) {
// iff objects a and b have the same prototype
// and a[k] `deepEqual` b[k] for all
// keys in a and b, then a `deepEqual` b
if (getProto(a) !== getProto(b)) {
return false;
}
var k;
for (k in a) {
if (hasOwn.call(a, k)) {
if (!hasOwn.call(b, k) || !deepEqual(a[k], b[k])) {
return false;
}
}
}
for (k in b) {
if (hasOwn.call(b, k)) {
// we should have checked that they are deepEqual
// already, so checking for presence is enough
if (!hasOwn.call(a, k)) {
return false;
}
}
}
return true;
}
function datesEqual (a, b) {
return a >= b && a <= b;
}
function deepEqual (a, b) {
return a === b ||
(isArray(a) && isArray(b) && arraysEqual(a, b)) ||
(isObject(a) && isObject(b) && objectsEqual(a, b)) ||
(isDate(a) && isDate(b) && datesEqual(a, b));
}
return deepEqual;
} ());
/**
* Ristretto is a lightweight assertion library for Mocha
* that is typically used as an AMD module, but can also be used without AMD.
*
* @module ristretto
* @example
* // As an AMD module
* require(['ristretto'], function (assert) {
* ...
* assert(a === b);
* assert.strictEqual(a, b);
* });
*
* // Without AMD
* var assert = ristretto;
* ...
* assert(a === b);
* assert.strictEqual(a, b);
*/
/**
* Lightweight assertion library for Mocha.
*
* @class ristretto
* @static
*/
var ristretto = function (expression, message) {
if (!expression) {
throw new AssertionError(message || 'expected expression to be truthy');
}
};
/**
* Assert that `value` is truthy.
*
* @method isTruthy
* @param value Value to test
* @param {String} [message] Failure message
* @since 1.3.0
*/
ristretto.isTruthy = function (value, message) {
if (!value) {
throw new AssertionError(message || value + ' is not truthy');
}
};
/**
* Assert that `value` is truthy.
*
* @method truthy
* @param value Value to test
* @param {String} [message] Failure message
* @deprecated Use `isTruthy` instead.
*/
ristretto.truthy = function (value, message) {
if (!value) {
throw new AssertionError(message || value + ' is not truthy');
}
};
/**
* Assert that `value` is falsey.
*
* @method isFalsey
* @param value Value to test
* @param {String} [message] Failure message
* @since 1.3.0
*/
ristretto.isFalsey = function (value, message) {
if (!value) {
return;
}
throw new AssertionError(message || value + ' is not falsey');
},
/**
* Assert that `value` is falsey.
*
* @method falsey
* @param value Value to test
* @param {String} [message] Failure message
* @deprecated Use `isFalsey` instead.
*/
ristretto.falsey = function (value, message) {
if (!value) {
return;
}
throw new AssertionError(message || value + ' is not falsey');
};
/**
* Explicitly fail.
*
* Unlike Chai this method isn't designed to have the same signature as
* node.js' `assert`.
*
* @method fail
* @param {String} [message] Failure message
*/
ristretto.fail = function (message) {
throw new AssertionError(message || 'explicit failure');
};
/**
* Asserts non-strict equality of `actual` and `expected`.
*
* @method equal
* @param actual Actual value
* @param expected Expected value
* @param {String} [message] Failure message
*/
ristretto.equal = function (actual, expected, message) {
if (actual != expected) {
throw new AssertionError(message || actual + ' does not equal ' + expected);
}
};
/**
* Asserts that `actual` and `expected` are not equal.
*
* @method notEqual
* @param actual Actual value
* @param expected Expected value
* @param {String} [message] Failure message
*/
ristretto.notEqual = function (actual, expected, message) {
if (actual == expected) {
throw new AssertionError(message || actual + ' equals ' + expected);
}
};
/**
* Assert strict equality of `actual` and `expected`.
*
* @method strictEqual
* @param actual Actual value
* @param expected Expected value
* @param {String} [message] Failure message
*/
ristretto.strictEqual = function (actual, expected, message) {
if (actual !== expected) {
throw new AssertionError(message || actual + ' does not equal ' + expected);
}
};
/**
* Assert strict inequality of `actual` and `expected`.
*
* @method strictNotEqual
* @param actual Actual value
* @param expected Expected value
* @param {String} [message] Failure message
*/
ristretto.strictNotEqual = function (actual, expected, message) {
if (actual !== expected) {
return;
}
throw new AssertionError(message || actual + ' equals ' + expected);
};
/**
* Asserts that `value` is `true`.
*
* @method isTrue
* @param value Value to test
* @param {String} [message] Failure message
*/
ristretto.isTrue = function (value, message) {
if (value !== true) {
throw new AssertionError(message || value + ' is not true');
}
};
/**
* Asserts that `value` is `false`.
*
* @method isFalse
* @param value Value to test
* @param {String} [message] Failure message
*/
ristretto.isFalse = function (value, message) {
if (value !== false) {
throw new AssertionError(message || value + ' is not false`');
}
};
/**
* Asserts that `actual` and `expected` are deeply-equivalent,
* either both values are primitive and strictly equal or they
* are both identical arrays or identical objects
*
* @method deepEqual
* @param actual
* @param expected
* @param {String} [message] Failure message
* @since 1.2.0
*/
ristretto.deepEqual = function (actual, expected, message) {
if (!deepEqual(actual, expected)) {
throw new AssertionError(message || actual + ' is not deeply equal to ' + expected);
}
};
/**
* Asserts that `actual` and `expected` are NOT deeply-equivalent.
*
* @method deepNotEqual
* @param actual
* @param expected
* @param {String} [message] Failure message
* @since 1.2.0
*/
ristretto.deepNotEqual = function (actual, expected, message) {
if (deepEqual(actual, expected)) {
throw new AssertionError(message || actual + ' is deeply equal to ' + expected);
}
};
/*global define: false */
if (typeof define === 'function' && define.amd) {
define([], function () {
return ristretto;
});
} else {
global.ristretto = ristretto;
}
}(window));