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react-cornea.js
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react-cornea.js
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import {render} from 'enzyme';
import phantom from 'phantom';
import imageDiff from 'image-diff';
import fs from 'fs';
import fileExists from 'file-exists';
import gm from 'gm';
const DEVICE_SIZES = {
MOBILE: { height: 800, width: 480 },
TABLET: { height: 1200, width: 768 },
DESKTOP: { height: 900, width: 1440 },
IPAD: { height: 1024, width: 768 },
IPAD_3RD_GEN: { height: 2048, width: 1536 },
IPAD_PRO: { height: 2732, width: 2048 },
IPHONE_4S: { height: 960, width: 640 },
IPHONE_5: { height: 1136, width: 640 },
IPHONE_6: { height: 1334, width: 750 },
GALAXY_Y: { height: 320, width: 240 },
GALAXY_ACE: { height: 400, width: 240 },
GALAXY_SIII_MINI: { height: 800, width: 480 },
GALAXY_SIII: { height: 1280, width: 720 },
GALAXY_NEXUS: { height: 1280, width: 720 },
GALAXY_S4: { height: 1920, width: 1080 },
GALAXY_NOTE_III: { height: 1920, width: 1080 },
GALAXY_NOTE_II: { height: 1280, width: 720 },
GALAXY_MEGA: { height: 1280, width: 720 },
GALAXY_MEGA_TV: { height: 960, width: 540 },
GALAXY_TAB_2: { height: 960, width: 540 },
GALAXY_TAB_3: { height: 1280, width: 800 },
GALAXYNOTE_10_1: { height: 2560, width: 1600 },
NEXUS_S: { height: 800, width: 480 },
NEXUS_4: { height: 1200, width: 768 },
NEXUS_5: { height: 1920, width: 1080 },
NEXUS_7_1ST_GEN: { height: 1280, width: 800 },
NEXUS_7_2ND_GEN: { height: 1824, width: 1200 },
NEXUS_10: { height: 2560, width: 1600 },
HTC_ONE_X: { height: 1280, width: 720 },
HTC_ONE: { height: 1920, width: 1080 },
HTC_ONE_MAX: { height: 1920, width: 1080 },
KINDLE_FIRE_1ST_GEN: { height: 1024, width: 600 },
KINDLE_FIRE_2ND_GEN: { height: 1024, width: 600 },
KINDLE_FIRE_HD: { height: 1920, width: 1200 },
KINDLE_FIRE_HDX: { height: 1920, width: 1200 }
};
export { DEVICE_SIZES };
class Stylesheets {
constructor() {
this.css = '';
}
addCSS(css) {
this.css += css;
}
addCSSFile(cssFilePath) {
let css = fs.readFileSync(cssFilePath).toString();
this.addCSS(css);
}
createStyles() {
return '<style>' + this.createReset() + this.css + '</style>';
}
createReset() {
let reset = `
/* http://meyerweb.com/eric/tools/css/reset/
v2.0 | 20110126
License: none (public domain)
*/
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
display: block;
}
body {
line-height: 1;
}
ol, ul {
list-style: none;
}
blockquote, q {
quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
content: '';
content: none;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
`;
return reset;
}
}
export { Stylesheets };
let imagemagick = gm.subClass({ imageMagick: true });
const renderHtml = (component, css, cssFile) => {
const wrapper = render(component);
let html = wrapper.html();
const stylesheets = new Stylesheets();
if (css) {
stylesheets.addCSS(css);
}
if (cssFile) {
stylesheets.addCSSFile(cssFile);
}
html = '<html><head>' + stylesheets.createStyles() + '</head><body>' + html + '</body></html>';
return html;
};
const createScreenshot = ({
resolve,
componentName,
html,
ref,
path,
viewportSize
}) => {
phantom.create().then((ph) => {
ph.createPage().then((page) => {
page.property('viewportSize', viewportSize).then(() => {
page.property('content', html).then(() => {
// TODO figure out a better way to do this
setTimeout(() => {
let fullFileName = path + 'yours-' + componentName + '.png';
page.render(fullFileName).then(() => {
ph.exit();
ref.currentSnap = fullFileName;
resolve(ref);
});
}, 1000);
});
});
});
});
};
/**
* Constructor
*/
const Differ = function ({
componentName,
component,
savePath,
viewportSize = DEVICE_SIZES.DESKTOP,
css = '',
cssFile = false,
threshold = 0,
onSnapshotsUpdated = () => {},
updateSnapshots = false,
onSnapshotCreated = () => {},
createSnapshots = false,
}) {
this.currentSnap = null;
this.currentDiff = null;
this.html = renderHtml(component, css, cssFile);
this.snap = ({ path = './' }) => {
let promise = new Promise((resolve, reject) => {
createScreenshot({
resolve,
reject,
componentName,
html: this.html,
path,
ref: this,
viewportSize
});
});
return promise;
};
this.compareTo = ({ path, filename }) => {
let promise = new Promise((resolve, reject) => {
this.currentDiff = path + 'difference.png';
imageDiff({
actualImage: path + filename,
expectedImage: this.currentSnap,
diffImage: path + 'difference.png',
threshold
}, function (err, imagesAreSame) {
if (err) {
reject(err);
}
imagemagick().command('composite')
.in('-gravity', 'center')
.in(path + 'difference.png')
.in(this.currentSnap)
.write(path + 'difference.png', function (err2) {
if (err2) {
reject(err2);
}
resolve(imagesAreSame);
});
}.bind(this));
});
return promise;
};
this.moveSnapshot = ({ path, filename }) => {
fs.renameSync( this.currentSnap, path + filename );
return true;
};
this.cleanup = () => {
if ( fileExists( this.currentSnap ) ) {
fs.unlinkSync( this.currentSnap );
}
if ( fileExists( this.currentDiff ) ) {
fs.unlinkSync( this.currentDiff );
}
};
this.compare = () => {
var promise = new Promise((resolve) => {
this.snap( { path: savePath } ).then((differ) => {
let willHandleUpdate = false;
if (process.env.UPDATE_SNAPSHOTS || updateSnapshots) {
willHandleUpdate = true;
if (typeof process.env.UPDATE_SNAPSHOTS === 'string' &&
process.env.UPDATE_SNAPSHOTS !== '1' &&
process.env.UPDATE_SNAPSHOTS !== 'true') {
// We are trying to update a specific component
// Flag componentNames that are not the one specified
// as false.
if (process.env.UPDATE_SNAPSHOTS !== componentName) {
willHandleUpdate = false;
}
}
}
if (willHandleUpdate) {
differ.moveSnapshot({ path: savePath, filename: 'theirs-' + componentName + '.png' });
differ.cleanup();
onSnapshotsUpdated();
} else if (process.env.CREATE_SNAPSHOTS || createSnapshots) {
let created = false;
if ( !fileExists( savePath + 'theirs-' + componentName + '.png' ) ) {
differ.moveSnapshot({ path: savePath, filename: 'theirs-' + componentName + '.png' });
created = true;
}
differ.cleanup();
onSnapshotCreated(created);
} else {
differ.compareTo({
path: savePath,
filename: 'theirs-' + componentName + '.png'
}).then((areTheSame) => {
resolve(areTheSame);
});
}
});
});
return promise;
};
};
export { Differ };