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blackbox.test.js
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blackbox.test.js
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import path from 'node:path';
import {createServer} from 'node:http';
import {fileURLToPath} from 'node:url';
import {Buffer} from 'node:buffer';
import process from 'node:process';
import fs from 'node:fs';
import {jest} from '@jest/globals';
import getPort from 'get-port';
import Vinyl from 'vinyl';
import nock from 'nock';
import async from 'async';
import finalhandler from 'finalhandler';
import serveStatic from 'serve-static';
import nn from 'normalize-newline';
import {generate} from '..';
import {read, readAndRemove} from './helper/index.js';
jest.setTimeout(100_000);
const __dirname = fileURLToPath(new URL('.', import.meta.url));
const FIXTURES_DIR = path.join(__dirname, '/fixtures/');
function assertCritical(target, expected, done, skipTarget) {
return (err, {css, html} = {}) => {
const output = /\.css$/.test(target) ? css : html;
if (err) {
console.log(err);
done(err);
}
try {
expect(err).toBeFalsy();
expect(output).toBeDefined();
if (!skipTarget) {
const dest = readAndRemove(target);
expect(dest).toBe(expected);
}
expect(nn(output)).toBe(expected);
} catch (error) {
done(error);
return;
}
done();
};
}
// Setup static fileserver to mimic remote requests
let server;
let port;
beforeAll(async () => {
const serve = serveStatic(path.join(__dirname, 'fixtures'), {index: ['index.html', 'index.htm']});
const serveUserAgent = serveStatic(path.join(__dirname, 'fixtures/useragent'), {
index: ['index.html', 'index.htm'],
});
port = await getPort();
server = createServer((req, res) => {
if (req.headers['user-agent'] === 'custom agent') {
return serveUserAgent(req, res, finalhandler(req, res));
}
serve(req, res, finalhandler(req, res));
}).listen(port);
});
afterAll(() => server.close());
// Prepare stderr mock
let stderr;
beforeEach(() => {
stderr = jest.spyOn(process.stderr, 'write').mockImplementation(() => true);
});
afterEach(() => {
stderr.mockRestore();
});
describe('generate (local)', () => {
test('generate critical-path CSS', (done) => {
const expected = read('expected/generate-default.css');
const target = path.resolve('.critical.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-default.html',
target,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('generate critical-path CSS from CSS files passed as Vinyl objects', (done) => {
const expected = read('expected/generate-default.css');
const target = path.resolve('.critical.css');
const stylesheets = ['fixtures/styles/main.css', 'fixtures/styles/bootstrap.css'].map((filePath) => {
return new Vinyl({
cwd: '/',
base: '/fixtures/',
path: filePath,
contents: Buffer.from(fs.readFileSync(path.join(__dirname, filePath), 'utf8'), 'utf8'),
});
});
generate(
{
base: FIXTURES_DIR,
src: 'generate-default-nostyle.html',
target,
css: stylesheets,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should throw an error on timeout', (done) => {
const target = path.join(__dirname, '.include.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-default.html',
penthouse: {
timeout: 1,
},
target,
width: 1300,
height: 900,
},
(err) => {
expect(err).toBeInstanceOf(Error);
done();
}
);
});
test('should throw a usable error when no stylesheets are found', (done) => {
const target = path.join(__dirname, '.error.css');
generate(
{
base: FIXTURES_DIR,
src: 'error.html',
penthouse: {
timeout: 1,
},
target,
width: 1300,
height: 900,
},
(err) => {
expect(err).toBeInstanceOf(Error);
fs.promises.unlink(target).then(() => done());
}
);
});
test('should generate critical-path CSS with query string in file name', (done) => {
const expected = read('expected/generate-default.css');
const target = path.resolve('.critical.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-default-querystring.html',
target,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should ignore stylesheets blocked due to 403', (done) => {
const expected = '';
const target = path.resolve('.403.css');
generate(
{
base: FIXTURES_DIR,
src: '403-css.html',
target,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should ignore stylesheets blocked due to 404', (done) => {
const expected = '';
const target = path.resolve('.404.css');
generate(
{
base: FIXTURES_DIR,
src: '404-css.html',
target,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should generate multi-dimension critical-path CSS', (done) => {
const expected = read('expected/generate-adaptive.css', 'utf8');
const target = path.resolve('.adaptive.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-adaptive.html',
target,
dimensions: [
{
width: 100,
height: 70,
},
{
width: 1000,
height: 70,
},
],
},
assertCritical(target, expected, done)
);
});
test('should consider inline styles', (done) => {
const expected = read('expected/generate-adaptive.css', 'utf8');
const target = path.resolve('.adaptive-inline.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-adaptive-inline.html',
target,
dimensions: [
{
width: 100,
height: 70,
},
{
width: 1000,
height: 70,
},
],
},
assertCritical(target, expected, done)
);
});
test('should consider data uris in stylesheet hrefs', (done) => {
const expected = read('expected/generate-adaptive.css', 'utf8');
const target = path.resolve('.adaptive-base64.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-adaptive-base64.html',
target,
dimensions: [
{
width: 100,
height: 70,
},
{
width: 1000,
height: 70,
},
],
},
assertCritical(target, expected, done)
);
});
test('should generate minified critical-path CSS', (done) => {
const expected = read('expected/generate-default.css', true);
const target = path.resolve('.critical.min.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-default.html',
target,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should generate minified critical-path CSS successfully with external css file configured', (done) => {
const expected = read('expected/generate-default.css', true);
const target = path.resolve('.nostyle.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-default-nostyle.html',
css: ['fixtures/styles/main.css', 'fixtures/styles/bootstrap.css'],
target,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should evaluate css passed as source string', (done) => {
const expected = 'html{display:block}';
const target = path.resolve('.source-string.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-default-nostyle.html',
css: ['html{display:block}.someclass{color:red}'],
target,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should inline relative images', (done) => {
const expected = read('expected/generate-image.css');
const target = path.resolve('.image-relative.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-image.html',
css: ['fixtures/styles/image-relative.css'],
target,
width: 1300,
height: 900,
inlineImages: true,
},
assertCritical(target, expected, done)
);
});
test('should inline relative images from folder', (done) => {
const expected = read('expected/generate-image.css');
const target = path.resolve('.image-relative.css');
generate(
{
base: FIXTURES_DIR,
src: 'folder/generate-image.html',
css: ['fixtures/styles/image-relative.css'],
target,
width: 1300,
height: 900,
inlineImages: true,
},
assertCritical(target, expected, done)
);
});
test('should rewrite relative images for html outside root', (done) => {
const expected = read('expected/generate-image-relative.css');
const target = path.resolve('fixtures/folder/.image-relative.css');
generate(
{
base: FIXTURES_DIR,
src: 'folder/generate-image.html',
css: ['fixtures/styles/image-relative.css'],
target,
width: 1300,
height: 900,
inlineImages: false,
},
assertCritical(target, expected, done)
);
});
test('should rewrite relative images for html outside root with css file', (done) => {
const expected = read('expected/generate-image-relative-subfolder.css');
const target = path.resolve('fixtures/folder/subfolder/.image-relative-subfolder.css');
generate(
{
base: FIXTURES_DIR,
src: 'folder/subfolder/generate-image-absolute.html',
target,
width: 1300,
height: 900,
inlineImages: false,
},
assertCritical(target, expected, done)
);
});
test('should rewrite relative images for html outside root destFolder option', (done) => {
const expected = read('expected/generate-image-relative-subfolder.css');
const target = path.resolve('.image-relative-subfolder.css');
generate(
{
base: FIXTURES_DIR,
src: 'folder/subfolder/generate-image-absolute.html',
// destFolder: 'folder/subfolder',
// Dest: target,
width: 1300,
height: 900,
inlineImages: false,
},
assertCritical(target, expected, done, true)
);
});
test('should rewrite relative images for html inside root', (done) => {
const expected = read('expected/generate-image-skip.css');
const target = path.resolve('.image-relative.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-image.html',
css: ['fixtures/styles/image-relative.css'],
target,
// destFolder: '.',
width: 1300,
height: 900,
inlineImages: false,
},
assertCritical(target, expected, done)
);
});
test('should inline absolute images', (done) => {
const expected = read('expected/generate-image.css');
const target = path.resolve('.image-absolute.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-image.html',
css: ['fixtures/styles/image-absolute.css'],
target,
// destFolder: '.',
width: 1300,
height: 900,
inlineImages: true,
},
assertCritical(target, expected, done)
);
});
test('should skip to big images', (done) => {
const expected = read('expected/generate-image-big.css');
const target = path.resolve('.image-big.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-image.html',
css: ['fixtures/styles/image-big.css'],
target,
// destFolder: '.',
width: 1300,
height: 900,
inlineImages: true,
},
assertCritical(target, expected, done)
);
});
test('considers "inlineImages" option', (done) => {
const expected = read('expected/generate-image-skip.css');
const target = path.resolve('.image-skip.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-image.html',
css: ['fixtures/styles/image-relative.css'],
target,
// destFolder: '.',
width: 1300,
height: 900,
inlineImages: false,
},
assertCritical(target, expected, done)
);
});
test('should not screw up win32 paths', (done) => {
const expected = read('expected/generate-image.css');
const target = path.resolve('.image.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-image.html',
css: ['fixtures/styles/some/path/image.css'],
target,
width: 1300,
height: 900,
inlineImages: true,
},
assertCritical(target, expected, done)
);
});
test('should respect pathPrefix', (done) => {
const expected = read('expected/path-prefix.css');
const target = path.resolve('.path-prefix1.css');
generate(
{
base: FIXTURES_DIR,
src: 'path-prefix.html',
css: ['fixtures/styles/path-prefix.css'],
target,
width: 1300,
height: 900,
// pathPrefix: ''
},
assertCritical(target, expected, done)
);
});
test('should detect pathPrefix', (done) => {
const expected = read('expected/path-prefix.css');
const target = path.resolve('.path-prefix2.css');
generate(
{
base: FIXTURES_DIR,
src: 'path-prefix.html',
css: ['fixtures/styles/path-prefix.css'],
target,
// destFolder: '.',
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should generate and inline, if "inline" option is set', (done) => {
const expected = read('expected/generateInline.html');
const target = path.join(__dirname, '.generateInline1.html');
generate(
{
base: FIXTURES_DIR,
src: 'generateInline.html',
// destFolder: '.',
target,
inline: true,
},
assertCritical(target, expected, done)
);
});
test('should generate and inline critical-path CSS', (done) => {
const expected = read('expected/generateInline.html');
const target = path.join(__dirname, '.generateInline2.html');
generate(
{
base: FIXTURES_DIR,
src: 'generateInline.html',
// destFolder: '.',
target,
inline: true,
},
assertCritical(target, expected, done)
);
});
test('should generate and inline minified critical-path CSS', (done) => {
const expected = read('expected/generateInline.html');
const target = path.join(__dirname, '.generateInline-minified3.html');
generate(
{
base: FIXTURES_DIR,
src: 'generateInline.html',
// destFolder: '.',
target,
inline: true,
},
assertCritical(target, expected, done)
);
});
test('should handle multiple calls', (done) => {
const expected1 = read('expected/generateInline.html');
const expected2 = read('expected/generateInline-svg.html');
async.series(
{
first(cb) {
generate(
{
base: FIXTURES_DIR,
src: 'generateInline.html',
inline: true,
},
cb
);
},
second(cb) {
generate(
{
base: FIXTURES_DIR,
src: 'generateInline-svg.html',
inline: true,
},
cb
);
},
},
(err, results) => {
try {
expect(err).toBeFalsy();
expect(nn(results.first.html)).toBe(expected1);
expect(nn(results.second.html)).toBe(expected2);
done();
} catch (error) {
done(error);
}
}
);
});
test('should inline critical-path CSS ignoring remote stylesheets', (done) => {
const expected = read('expected/generateInline-external-minified.html');
const target = path.resolve('.generateInline-external.html');
generate(
{
base: FIXTURES_DIR,
src: 'generateInline-external.html',
inlineImages: false,
target,
inline: true,
},
assertCritical(target, expected, done)
);
});
test('should inline critical-path CSS with extract option ignoring remote stylesheets', (done) => {
const expected = read('expected/generateInline-external-extract.html');
const target = path.resolve('.generateInline-external-extract.html');
generate(
{
base: FIXTURES_DIR,
src: 'generateInline-external.html',
inlineImages: false,
extract: true,
target,
inline: true,
},
assertCritical(target, expected, done)
);
});
test('should inline critical-path CSS without screwing svg images ', (done) => {
const expected = read('expected/generateInline-svg.html');
const target = path.resolve('.generateInline-svg.html');
generate(
{
base: FIXTURES_DIR,
src: 'generateInline-svg.html',
target,
inline: true,
},
assertCritical(target, expected, done)
);
});
test('should inline and extract critical-path CSS', (done) => {
const expected = read('expected/generateInline-extract.html');
const target = path.resolve('.generateInline-extract.html');
generate(
{
base: FIXTURES_DIR,
extract: true,
src: 'generateInline.html',
target,
inline: true,
},
assertCritical(target, expected, done)
);
});
test('should inline and extract critical-path CSS from html source', (done) => {
const expected = read('expected/generateInline-extract.html');
const target = path.resolve('.generateInline-extract-src.html');
generate(
{
base: FIXTURES_DIR,
extract: true,
html: read('fixtures/generateInline.html'),
target,
inline: true,
},
assertCritical(target, expected, done)
);
});
test('should consider "ignore" option', (done) => {
const expected = read('expected/generate-ignore.css');
const target = path.resolve('.ignore.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-default.html',
target,
ignore: ['@media', '.header', /jumbotron/],
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should handle empty "ignore" array', (done) => {
const expected = read('expected/generate-default.css', true);
const target = path.join(__dirname, '.ignore.min.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-default.html',
target,
ignore: [],
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should handle ignore "@font-face"', (done) => {
const expected = read('expected/generate-ignorefont.css', true);
const target = path.join(__dirname, '.ignorefont.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-ignorefont.html',
target,
ignore: ['@font-face'],
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should keep styles defined by the `include` option', (done) => {
const expected = read('fixtures/styles/include.css');
const target = path.join(__dirname, '.include.css');
generate(
{
base: FIXTURES_DIR,
src: 'include.html',
include: [/someRule/],
target,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('#192 - include option - generate', (done) => {
const expected = read('expected/issue-192.css');
const target = path.join(__dirname, '.issue-192.css');
generate(
{
base: FIXTURES_DIR,
src: 'issue-192.html',
css: ['fixtures/styles/issue-192.css'],
dimensions: [
{
width: 320,
height: 480,
},
{
width: 768,
height: 1024,
},
{
width: 1280,
height: 960,
},
{
width: 1920,
height: 1080,
},
],
extract: false,
ignore: ['@font-face', /url\(/],
include: [/^\.main-navigation.*$/, /^\.hero-deck.*$/, /^\.deck.*$/, /^\.search-box.*$/],
target,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should not complain about missing css if the css is passed via options', (done) => {
const expected = read('expected/generate-default-nostyle.css');
const target = path.join(__dirname, '.generate-default-nostyle.css');
generate(
{
base: FIXTURES_DIR,
src: 'generate-default-nostyle.html',
css: ['fixtures/styles/bootstrap.css'],
target,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should not complain about missing css if the css is passed via options (inline)', (done) => {
const expected = read('expected/generate-default-nostyle.html');
const target = path.join(__dirname, '.generate-default-nostyle.html');
generate(
{
base: FIXTURES_DIR,
src: 'generate-default-nostyle.html',
css: ['fixtures/styles/bootstrap.css'],
target,
inline: true,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('should handle PAGE_UNLOADED_DURING_EXECUTION error (inline)', (done) => {
const expected = read('fixtures/issue-314.html');
const target = path.join(__dirname, '.issue-314.html');
generate(
{
base: FIXTURES_DIR,
src: 'issue-314.html',
css: ['fixtures/styles/bootstrap.css'],
target,
inline: true,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test.skip('should handle PAGE_UNLOADED_DURING_EXECUTION error', (done) => {
const expected = '';
const target = path.join(__dirname, '.issue-314.css');
generate(
{
base: FIXTURES_DIR,
src: 'issue-314.html',
css: ['fixtures/styles/bootstrap.css'],
target,
inline: false,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
// external css changed
test.skip('external CSS with absolute url', (done) => {
const expected = read('expected/issue-395.css');
const target = path.join(__dirname, '.issue-395.css');
generate(
{
base: FIXTURES_DIR,
src: 'issue-395.html',
target,
inline: false,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
test('Correctly order css on multiple dimensions', (done) => {
const dimensions = [700, 600, 100, 200, 250, 150, 350, 400, 450, 500, 300, 550, 50].map((width) => {
return {width, height: 1000};
});
const expected = read('fixtures/styles/issue-415.css');
const target = path.join(__dirname, '.issue-415.css');
generate(
{
base: FIXTURES_DIR,
src: 'issue-415.html',
target,
inline: false,
dimensions,
concurrency: 10,
},
assertCritical(target, expected, done)
);
});
test('Ignore inlined stylesheets (disabled)', (done) => {
const inlineStyles = '.test-selector{color:#00f}';
const target = path.join(__dirname, '.ignore-inlined-styles.css');
generate(
{
base: FIXTURES_DIR,
src: 'ignoreInlinedStyles.html',
target,
ignoreInlinedStyles: false,
inline: false,
concurrency: 1,
},
assertCritical(target, inlineStyles, done)
);
});
test('Ignore inlined stylesheets (enabled)', (done) => {
const target = path.join(__dirname, '.ignore-inlined-styles.css');
generate(
{
base: FIXTURES_DIR,
src: 'ignoreInlinedStyles.html',
target,
ignoreInlinedStyles: true,
inline: false,
concurrency: 1,
},
assertCritical(target, '', done)
);
});
test('issue #566 - consider base tag', (done) => {
const expected = read('expected/issue-566.css');
const target = path.join(__dirname, '.issue-566.css');
generate(
{
base: FIXTURES_DIR,
src: 'issue-566.html',
target,
inline: false,
width: 1300,
height: 900,
},
assertCritical(target, expected, done)
);
});
});
describe('generate (remote)', () => {
test('should generate critical-path CSS', (done) => {
const expected = read('expected/generate-default.css');
const target = path.join(__dirname, '.critical.css');
generate(
{
src: `http://localhost:${port}/generate-default.html`,
target,
width: 1300,
height: 900,