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web-test-runner.config.ts
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import { platform } from 'node:os';
import { parseArgs } from 'node:util';
import { litSsrPlugin } from '@lit-labs/testing/web-test-runner-ssr-plugin.js';
import {
defaultReporter,
type TestRunnerConfig,
type TestRunnerCoreConfig,
type TestRunnerGroupConfig,
} from '@web/test-runner';
import { a11ySnapshotPlugin } from '@web/test-runner-commands/plugins';
import {
type PlaywrightLauncherArgs,
playwrightLauncher,
type PlaywrightLauncher,
} from '@web/test-runner-playwright';
import { puppeteerLauncher } from '@web/test-runner-puppeteer';
import { visualRegressionPlugin } from '@web/test-runner-visual-regression/plugin';
import { initCompiler } from 'sass';
import {
configureRemotePlaywrightBrowser,
minimalReporter,
patchedSummaryReporter,
containerPlaywrightBrowserPlugin,
visualRegressionConfig,
vitePlugin,
preloadIcons,
} from './tools/web-test-runner/index.js';
const { values: cliArgs } = parseArgs({
strict: false,
options: {
file: { type: 'string' },
ci: { type: 'boolean', default: !!process.env.CI },
debug: { type: 'boolean' },
'all-browsers': { type: 'boolean', short: 'a' },
firefox: { type: 'boolean' },
webkit: { type: 'boolean' },
parallel: { type: 'boolean' },
'update-visual-baseline': { type: 'boolean' },
group: { type: 'string' },
ssr: { type: 'boolean' },
container: { type: 'boolean' },
local: { type: 'boolean' },
},
});
const concurrency = cliArgs.parallel ? {} : { concurrency: 1 };
const launchOptions: PlaywrightLauncherArgs = {
launchOptions: {
ignoreDefaultArgs: ['--hide-scrollbars'],
// Enables focusing links with tab on Firefox, probably only relevant on macOS.
firefoxUserPrefs: { 'accessibility.tabfocus': 7 },
},
};
const stylesCompiler = initCompiler();
const renderStyles = (): string =>
stylesCompiler.compile('./src/elements/core/styles/standard-theme.scss', {
loadPaths: ['.', './node_modules/'],
}).css;
const browsers =
cliArgs.ci || cliArgs['all-browsers']
? // Parallelism has problems, we need force concurrency to 1
(['chromium', 'firefox', 'webkit'] as const).map((product) =>
playwrightLauncher({
product,
...concurrency,
...launchOptions,
}),
)
: cliArgs.firefox
? [playwrightLauncher({ product: 'firefox', ...launchOptions })]
: cliArgs.webkit
? [playwrightLauncher({ product: 'webkit', ...launchOptions })]
: cliArgs.debug
? [
puppeteerLauncher({
launchOptions: { headless: false, devtools: true },
...concurrency,
}),
]
: [playwrightLauncher({ product: 'chromium', ...launchOptions })];
const preloadedIcons = await preloadIcons();
const testRunnerHtml = (
testFramework: string,
_config: TestRunnerCoreConfig,
group?: TestRunnerGroupConfig,
): string => `
<!DOCTYPE html>
<html lang='en'>
<head>${['Roman', 'Bold', 'Light']
.map(
(type) => `
<link
rel="preload"
href="https://cdn.app.sbb.ch/fonts/v1_6_subset/SBBWeb-${type}.woff2"
as="font"
type="font/woff2"
crossorigin="anonymous"
/>`,
)
.join('')}
<link rel="preload" as="script" crossorigin="anonymous" href="/src/elements/core/testing/test-setup.ts">
<style type="text/css">${renderStyles()}</style>
<script>
globalThis.testEnv = '${cliArgs.debug ? 'debug' : ''}';
globalThis.testGroup = '${cliArgs.ssr ? 'ssr' : (group?.name ?? 'default')}';
globalThis.testRunScript = '${testFramework}';
</script>
</head>
<body class="sbb-disable-animation">${preloadedIcons
.map(
(i) => `
<template id="icon:${i.namespace}:${i.icon}">${i.svg}</template>`,
)
.join('')}
<script type="module" src="/src/elements/core/testing/test-setup.ts"></script>
</body>
</html>
`;
// A list of log messages, that should not be printed to the test console.
const suppressedLogs = [
'Lit is in dev mode. Not recommended for production! See https://lit.dev/msg/dev-mode for more information.',
'[vite] connecting...',
'[vite] connected.',
];
const testFile = typeof cliArgs.file === 'string' && cliArgs.file ? cliArgs.file : undefined;
const groups: TestRunnerGroupConfig[] = [
{ name: 'ssr', files: testFile ?? 'src/**/*.ssr.spec.ts', testRunnerHtml },
];
// The visual regression test group is only added when explicitly set, as the tests are very expensive.
if (cliArgs.group === 'visual-regression') {
groups.push({
name: 'visual-regression',
files: testFile ?? 'src/**/*.visual.spec.ts',
testRunnerHtml,
});
if (!cliArgs.local && platform() !== 'linux') {
console.log(
`Running visual regression tests in a non-linux environment. Switching to container usage. Use --local to opt-out.`,
);
cliArgs.container = true;
}
}
if (cliArgs.container) {
browsers
.filter((b): b is PlaywrightLauncher => b.type === 'playwright')
.forEach((browser) => configureRemotePlaywrightBrowser(browser));
}
export default {
files: testFile ?? ['src/**/*.spec.ts', '!**/*.{visual,ssr}.spec.ts'],
groups,
nodeResolve: true,
reporters:
cliArgs.debug || !cliArgs.ci
? [defaultReporter(), patchedSummaryReporter()]
: [minimalReporter()],
browsers: browsers,
concurrentBrowsers: 3,
plugins: [
a11ySnapshotPlugin(),
litSsrPlugin(),
vitePlugin(),
visualRegressionPlugin({
...visualRegressionConfig,
update: !!cliArgs['update-visual-baseline'],
}),
...(cliArgs.container ? [containerPlaywrightBrowserPlugin()] : []),
],
testFramework: {
config: {
timeout: '10000',
slow: '1000',
failZero: true,
},
},
coverageConfig: {
exclude: ['**/node_modules/**/*', '**/assets/*.svg', '**/assets/*.png', '**/*.scss'],
},
filterBrowserLogs: (log) => !suppressedLogs.includes(log.args[0]),
testRunnerHtml,
} satisfies TestRunnerConfig;