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web-test-runner.config.js
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web-test-runner.config.js
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import { visualRegressionPlugin } from '@web/test-runner-visual-regression/plugin';
import { playwrightLauncher } from '@web/test-runner-playwright';
import pixelmatch from 'pixelmatch';
import { PNG } from 'pngjs';
const fuzzy = ['win32', 'darwin'].includes(process.platform); // allow for 1% difference on non-linux OSs
const local = !process.env.CI;
console.assert(local, 'Running in CI!');
console.assert(!fuzzy, 'Running on OS with 1% test pixel diff threshold!');
const thresholdPercentage = fuzzy && local ? 0 : 0;
const filteredLogs = [
'Running in dev mode',
'Lit is in dev mode',
'mwc-list-item scheduled an update',
];
const browsers = [
playwrightLauncher({ product: 'chromium' }),
playwrightLauncher({ product: 'firefox' }),
playwrightLauncher({ product: 'webkit' }),
];
function defaultGetImageDiff({ baselineImage, image, options }) {
let error = '';
let basePng = PNG.sync.read(baselineImage);
let png = PNG.sync.read(image);
let { width, height } = png;
if (basePng.width !== png.width || basePng.height !== png.height) {
error =
`Screenshot is not the same width and height as the baseline. ` +
`Baseline: { width: ${basePng.width}, height: ${basePng.height} }` +
`Screenshot: { width: ${png.width}, height: ${png.height} }`;
width = Math.max(basePng.width, png.width);
height = Math.max(basePng.height, png.height);
let oldPng = basePng;
basePng = new PNG({ width, height });
oldPng.data.copy(basePng.data, 0, 0, oldPng.data.length);
oldPng = png;
png = new PNG({ width, height });
oldPng.data.copy(png.data, 0, 0, oldPng.data.length);
}
const diff = new PNG({ width, height });
const numDiffPixels = pixelmatch(basePng.data, png.data, diff.data, width, height, options);
const diffPercentage = (numDiffPixels / (width * height)) * 100;
return {
error,
diffImage: PNG.sync.write(diff),
diffPercentage,
};
}
export default /** @type {import("@web/test-runner").TestRunnerConfig} */ ({
plugins: [
visualRegressionPlugin({
update: process.argv.includes('--update-visual-baseline'),
getImageDiff: (options) => {
const result = defaultGetImageDiff(options);
if (result.diffPercentage < thresholdPercentage)
result.diffPercentage = 0;
return result;
}
}),
],
files: 'dist/**/*.spec.js',
groups: [
{
name: 'visual',
files: 'dist/**/*.test.js',
testRunnerHtml: testFramework => `
<html>
<head>
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@300&family=Roboto:wght@300;400;500&display=swap">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Material+Icons&display=block">
</head>
<body>
<style class="deanimator">
*, *::before, *::after {
-moz-transition: none !important;
transition: none !important;
-moz-animation: none !important;
animation: none !important;
}
</style>
<script>window.process = { env: ${JSON.stringify(process.env)} }</script>
<script type="module" src="${testFramework}"></script>
<script>
function descendants(parent) {
return (Array.from(parent.childNodes)).concat(
...Array.from(parent.children).map(child => descendants(child))
);
}
const deanimator = document.querySelector('.deanimator');
function deanimate(element) {
if (!element.shadowRoot) return;
if (element.shadowRoot.querySelector('.deanimator')) return;
const style = deanimator.cloneNode(true);
element.shadowRoot.appendChild(style);
descendants(element.shadowRoot).forEach(deanimate);
}
const observer = new MutationObserver((mutationList, observer) => {
for (const mutation of mutationList) {
if (mutation.type === 'childList') {
descendants(document.body).forEach(deanimate);
}
}
});
observer.observe(document.body, {childList: true, subtree:true});
</script>
<style>
* {
margin: 0px;
padding: 0px;
}
body {
background: white;
}
</style>
</body>
</html>`,
},
],
/** Resolve bare module imports */
nodeResolve: {
exportConditions: ['browser', 'development'],
},
/** Filter out lit dev mode logs */
filterBrowserLogs(log) {
for (const arg of log.args) {
if (typeof arg === 'string' && filteredLogs.some(l => arg.includes(l))) {
return false;
}
}
return true;
},
/** Compile JS for older browsers. Requires @web/dev-server-esbuild plugin */
// esbuildTarget: 'auto',
/** Amount of browsers to run concurrently */
concurrentBrowsers: 3,
/** Amount of test files per browser to test concurrently */
concurrency: 2,
/** Browsers to run tests on */
browsers,
// See documentation for all available options
});