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visual-regression-test.js
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const fs = require('fs');
const async = require('async');
const PNG = require('pngjs').PNG;
const uploadfs = require('uploadfs')();
const folder = __dirname + '/screenshots';
const screenshots = fs.readdirSync(folder + '/latest');
const match = require('pixelmatch');
const comparable = {};
const errors = {};
if (!fs.existsSync(folder)) {
console.log(folder + 'allegedly does not exist, creating it');
fs.mkdirSync(folder);
}
const archive = (new Date()).toString();
return async.series([
initUploadfs,
compare,
uploadPrevious,
uploadArchival,
uploadLatest,
uploadReport
], function(err) {
if (err) {
console.error(err);
process.exit(1);
}
process.exit(0);
});
function initUploadfs(callback) {
return uploadfs.init({
backend: process.env.VISUAL_BACKEND || 'local',
uploadsPath: process.env.VISUAL_UPLOADS_PATH || (__dirname + '/test-uploadfs'),
uploadsUrl: process.env.VISUAL_UPLOADS_URL || 'file://' + __dirname + '/test-uploadfs',
secret: process.env.VISUAL_SECRET,
key: process.env.VISUAL_KEY,
bucket: process.env.VISUAL_BUCKET,
region: process.env.VISUAL_REGION
}, callback);
}
function compare(callback) {
if (!fs.existsSync(folder + '/previous')) {
fs.mkdirSync(folder + '/previous');
}
if (!fs.existsSync(folder + '/diffs')) {
fs.mkdirSync(folder + '/diffs');
}
return async.series([
compare
], callback);
function compare(callback) {
return async.eachSeries(screenshots, function(screenshot, callback) {
if (!comparable[screenshot]) {
return setImmediate(callback);
}
const name = screenshot;
const img1 = fs.createReadStream(folder + '/previous/' + name).pipe(new PNG()).on('parsed', doneReading);
const img2 = fs.createReadStream(folder + '/latest/' + screenshot).pipe(new PNG()).on('parsed', doneReading);
function doneReading() {
if (!img1.data || !img2.data) {
// Wait for both
return;
}
const diff = new PNG({ width: img1.width, height: img1.height });
const diffs = match(img1.data, img2.data, diff.data, diff.width, diff.height, {});
return diff.pack().pipe(fs.createWriteStream(folder + '/diffs/' + name)).on('close', function() {
var error = Math.round(100 * 100 * diffs / (diff.width * diff.height));
errors[screenshot] = error;
return uploadfs.copyIn(folder + '/diffs/' + name, '/diffs/' + name, callback);
});
}
}, callback);
}
}
function uploadPrevious(callback) {
return async.eachSeries(screenshots, function(screenshot, callback) {
return uploadfs.copyIn(folder + '/previous/' + screenshot, '/previous/' + screenshot, callback);
}, callback);
}
function uploadLatest(callback) {
return async.eachSeries(screenshots, function(screenshot, callback) {
return uploadfs.copyIn(folder + '/latest/' + screenshot, '/latest/' + screenshot, callback);
}, callback);
}
function uploadArchival(callback) {
return async.eachSeries(screenshots, function(screenshot, callback) {
return uploadfs.copyIn(folder + '/latest/' + screenshot, '/archival/' + archive + '/' + screenshot, callback);
}, callback);
}
function uploadReport(callback) {
const comparables = screenshots.filter(screenshot => {
return comparable[screenshot];
});
comparables.sort((a, b) => {
if (errors[a] > errors[b]) {
return -1;
} else if (errors[b] > errors[a]) {
return 1;
} else {
return 0;
}
});
fs.writeFileSync(folder + '/index.html', `<!DOCTYPE html>
<html>
<head>
<title>Visual Regression Diff Report</title>
<style>
body {
font-family: Helvetica;
}
img {
width: 100%;
}
h1 {
text-align: center;
font-weight: normal;
}
h4 {
text-align: center;
font-weight: normal;
font-size: 24px;
}
h5 {
text-align: center;
font-weight: normal;
}
.previous,.latest,.diff {
float: left;
width: 33.33333%;
}
.clearfix {
clear: left;
}
</style>
</head>
<body>
<h1>Visual Regression Diff Report</h1>
${
comparables.map(screenshot =>
`
<h4>${screenshot}</h4>
<div class="previous">
<h5>Previous</h5>
<div><img src="previous/${screenshot}" /></div>
</div>
<div class="latest">
<h5>Latest</h5>
<div><img src="latest/${screenshot}" /></div>
</div>
<div class="diff">
<h5>Diff</h5>
<div><img src="diffs/${screenshot}" /></div>
</div>
<div class="clearfix"></div>
`
).join('')
}
</body>
</html>
`);
return uploadfs.copyIn(folder + '/index.html', '/index.html', callback);
}