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Tests: Add visual regression tests for admin reskin pages.
Add 10 new visual regression snapshot tests covering admin pages most impacted by the CSS reskin that previously had no automated visual coverage. Combined with the 22 existing tests, this brings total coverage to 32 admin pages. Also adds a single-command workflow (npm run test:visual), impact summary reporter, fast re-run mode, and auto-open HTML report to streamline CSS iteration during the admin reskin effort.
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‎package.json‎

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"test:php": "node ./tools/local-env/scripts/docker.js run --rm php ./vendor/bin/phpunit",
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"test:coverage": "npm run test:php -- --coverage-html ./coverage/html/ --coverage-php ./coverage/php/report.php --coverage-text=./coverage/text/report.txt",
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"test:e2e": "wp-scripts test-playwright --config tests/e2e/playwright.config.js",
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"test:visual": "wp-scripts test-playwright --config tests/visual-regression/playwright.config.js",
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"test:visual": "bash tests/visual-regression/compare-branches.sh",
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"test:visual:quick": "bash tests/visual-regression/compare-branches.sh --skip-baselines",
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"gutenberg:checkout": "node tools/gutenberg/checkout-gutenberg.js",
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"gutenberg:build": "node tools/gutenberg/build-gutenberg.js",
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"gutenberg:copy": "node tools/gutenberg/copy-gutenberg-build.js",

‎tests/visual-regression/README.md‎

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These tests make use of Playwright, with a setup very similar to that of the e2e tests.
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## Prerequisites
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- Node.js >= 20.10.0
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- A running WordPress environment (`npm run env:start`)
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- Playwright browsers installed (`npx playwright install chromium`)
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## How to Run the Tests Locally
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1. Check out trunk.
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2. Run `npm run test:visual` to generate some base snapshots.
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From a feature branch with a clean working tree, run:
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```bash
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npm run test:visual
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```
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This will automatically:
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1. Check out trunk to generate baseline snapshots.
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2. Return to your feature branch.
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3. Compare the current branch against those baselines.
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4. Print a visual impact summary in the terminal.
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5. Open the HTML report with side-by-side visual diffs.
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### Quick Re-run (Skip Baseline Generation)
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After the first run, baselines from trunk are already saved. To re-compare without regenerating them:
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```bash
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npm run test:visual:quick
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```
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This is useful when iterating on CSS — no need to commit changes or wait for trunk baselines to regenerate each time.
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**Typical workflow:**
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```bash
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npm run test:visual # First run: generates baselines from trunk
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# ... tweak CSS ...
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npm run test:visual:quick # Fast: reuses existing baselines
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# ... tweak more CSS ...
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npm run test:visual:quick # Fast again
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```
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### Specifying a Base Branch
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By default, baselines are generated from `trunk`. To compare against a different branch:
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```bash
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npm run test:visual -- some-other-branch
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```
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### Manual 2-Step Workflow
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You can also generate baselines and compare manually:
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1. Check out the base branch (e.g. trunk).
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2. Run `npx playwright test --config tests/visual-regression/playwright.config.js --update-snapshots`
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3. Check out the feature branch to be tested.
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4. Run `npm run test:visual` again. If any tests fail, the diff images can be found in `artifacts/`
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4. Run `npx playwright test --config tests/visual-regression/playwright.config.js`
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## Impact Summary
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After each run, a summary is printed to the terminal showing which pages changed and which remained unchanged:
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```
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────────────────────────────────────────────────
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Visual Impact Summary
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────────────────────────────────────────────────
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Changed: 27 of 35 pages
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Unchanged: 8 of 35 pages
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Changed:
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Dashboard, All Posts, Categories, Tags, ...
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Unchanged:
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Login, Media Settings, ...
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────────────────────────────────────────────────
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```
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The HTML report also opens automatically with side-by-side visual diffs for detailed inspection.

‎tests/visual-regression/compare-branches.sh‎

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#!/bin/bash
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set -e
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SKIP_BASELINES=false
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BASELINE_BRANCH="trunk"
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# Parse arguments.
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for arg in "$@"; do
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case "$arg" in
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--skip-baselines)
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SKIP_BASELINES=true
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;;
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*)
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BASELINE_BRANCH="$arg"
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;;
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esac
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done
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CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
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SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
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CONFIG="$SCRIPT_DIR/playwright.config.js"
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if [ "$CURRENT_BRANCH" = "$BASELINE_BRANCH" ]; then
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echo "Error: Already on $BASELINE_BRANCH. Checkout a feature branch first."
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exit 1
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fi
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if [ "$SKIP_BASELINES" = true ]; then
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# Verify baselines exist before skipping regeneration.
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SNAPSHOT_DIR="$SCRIPT_DIR/specs/__snapshots__"
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if [ ! -d "$SNAPSHOT_DIR" ] || [ -z "$(ls -A "$SNAPSHOT_DIR" 2>/dev/null)" ]; then
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echo "Error: No baselines found. Run 'npm run test:visual' first to generate them."
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exit 1
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fi
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echo "Skipping baseline generation (reusing existing baselines)..."
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echo "Ensuring Playwright browsers are installed..."
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npx playwright install --with-deps chromium
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echo "Comparing against existing baselines..."
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npx playwright test --config "$CONFIG" || true
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else
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if ! git diff-index --quiet HEAD --; then
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echo "Error: Uncommitted changes detected. Please commit or stash before running."
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exit 1
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fi
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echo "Ensuring Playwright browsers are installed..."
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npx playwright install --with-deps chromium
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echo "Generating baselines from $BASELINE_BRANCH..."
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git checkout "$BASELINE_BRANCH"
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npx playwright test --config "$CONFIG" --update-snapshots
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echo "Comparing against $CURRENT_BRANCH..."
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git checkout "$CURRENT_BRANCH"
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npx playwright test --config "$CONFIG" || true
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fi

‎tests/visual-regression/playwright.config.js‎

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'storage-states/admin.json'
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);
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const reporter = [
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[ 'list' ],
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[
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'html',
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{
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open: process.env.CI ? 'never' : 'always',
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outputFolder: path.join(
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process.env.WP_ARTIFACTS_PATH,
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'visual-report'
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),
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},
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],
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[ './reporters/impact-summary.js' ],
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];
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const config = defineConfig( {
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...baseConfig,
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globalSetup: undefined,
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reporter,
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webServer: {
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...baseConfig.webServer,
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command: 'npm run env:start',

‎tests/visual-regression/reporters/impact-summary.js‎

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/**
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* Impact Summary Reporter
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*
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* A custom Playwright reporter that prints a visual impact summary
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* at the end of the test run, showing which pages changed and which
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* remained unchanged.
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*/
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class ImpactSummaryReporter {
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constructor() {
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this.changed = [];
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this.unchanged = [];
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}
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onTestEnd( test, result ) {
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const name = test.title;
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if ( result.status === 'passed' ) {
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this.unchanged.push( name );
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} else {
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this.changed.push( name );
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}
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}
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onEnd() {
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const total = this.changed.length + this.unchanged.length;
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if ( total === 0 ) {
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return;
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}
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const separator = '─'.repeat( 48 );
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console.log( '' );
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console.log( separator );
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console.log( 'Visual Impact Summary' );
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console.log( separator );
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console.log(
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`Changed: ${ this.changed.length } of ${ total } pages`
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);
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console.log(
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`Unchanged: ${ this.unchanged.length } of ${ total } pages`
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);
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if ( this.changed.length > 0 ) {
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console.log( '' );
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console.log( 'Changed:' );
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console.log( ` ${ this.changed.join( ', ' ) }` );
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}
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if ( this.unchanged.length > 0 ) {
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console.log( '' );
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console.log( 'Unchanged:' );
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console.log( ` ${ this.unchanged.join( ', ' ) }` );
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}
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console.log( separator );
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console.log( '' );
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}
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}
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module.exports = ImpactSummaryReporter;

‎tests/visual-regression/specs/visual-snapshots.test.js‎

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mask: elementsToHide.map( ( selector ) => page.locator( selector ) ),
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});
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} );
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test( 'Dashboard', async ({ admin, page }) => {
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await admin.visitAdminPage( '/index.php' );
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await expect( page ).toHaveScreenshot( 'Dashboard.png', {
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mask: elementsToHide.map( ( selector ) => page.locator( selector ) ),
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});
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} );
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test( 'Themes', async ({ admin, page }) => {
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await admin.visitAdminPage( '/themes.php' );
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await expect( page ).toHaveScreenshot( 'Themes.png', {
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mask: [
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...elementsToHide,
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'.theme-screenshot img',
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].map( ( selector ) => page.locator( selector ) ),
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});
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} );
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test( 'General Settings', async ({ admin, page }) => {
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await admin.visitAdminPage( '/options-general.php' );
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await expect( page ).toHaveScreenshot( 'General Settings.png', {
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mask: elementsToHide.map( ( selector ) => page.locator( selector ) ),
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});
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} );
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test( 'Writing Settings', async ({ admin, page }) => {
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await admin.visitAdminPage( '/options-writing.php' );
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await expect( page ).toHaveScreenshot( 'Writing Settings.png', {
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mask: elementsToHide.map( ( selector ) => page.locator( selector ) ),
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});
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} );
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test( 'Permalink Settings', async ({ admin, page }) => {
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await admin.visitAdminPage( '/options-permalink.php' );
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await expect( page ).toHaveScreenshot( 'Permalink Settings.png', {
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mask: elementsToHide.map( ( selector ) => page.locator( selector ) ),
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});
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} );
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test( 'Add New Post', async ({ admin, page }) => {
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await admin.visitAdminPage( '/post-new.php' );
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await expect( page ).toHaveScreenshot( 'Add New Post.png', {
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mask: [
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...elementsToHide,
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'#wp-content-editor-container',
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].map( ( selector ) => page.locator( selector ) ),
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});
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} );
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test( 'Edit Post', async ({ admin, page, requestUtils }) => {
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const post = await requestUtils.rest( {
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method: 'POST',
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path: '/wp/v2/posts',
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data: {
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title: 'Visual Regression Test Post',
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content: 'Test content for visual regression.',
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status: 'publish',
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},
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} );
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await admin.visitAdminPage( '/post.php', `post=${ post.id }&action=edit` );
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await expect( page ).toHaveScreenshot( 'Edit Post.png', {
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mask: [
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...elementsToHide,
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'#wp-content-editor-container',
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].map( ( selector ) => page.locator( selector ) ),
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});
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} );
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test( 'Site Health', async ({ admin, page }) => {
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await admin.visitAdminPage( '/site-health.php' );
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await expect( page ).toHaveScreenshot( 'Site Health.png', {
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mask: [
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...elementsToHide,
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'.site-health-issues .health-check-accordion',
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].map( ( selector ) => page.locator( selector ) ),
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});
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} );
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test( 'Updates', async ({ admin, page }) => {
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await admin.visitAdminPage( '/update-core.php' );
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await expect( page ).toHaveScreenshot( 'Updates.png', {
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mask: [
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...elementsToHide,
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'form.upgrade',
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'.last-checked',
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].map( ( selector ) => page.locator( selector ) ),
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});
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} );
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} );
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test.describe( 'Unauthenticated Visual Snapshots', () => {
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test.use( { storageState: {} } );
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test( 'Login', async ({ page }) => {
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await page.goto( '/wp-login.php' );
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await expect( page ).toHaveScreenshot( 'Login.png' );
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} );
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} );

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