test: add firefox to the list of browsers to test

package.json

@@ -30,8 +30,8 @@
     "test:smoke:docs": "turbo run build --filter=docs",
     "test:check-examples": "node ./scripts/smoke/check.js",
     "test:vite-ci": "turbo run test --filter=astro",
-    "test:e2e": "cd packages/astro && pnpm playwright install chromium && pnpm run test:e2e",
-    "test:e2e:match": "cd packages/astro && pnpm playwright install chromium && pnpm run test:e2e:match",
+    "test:e2e": "cd packages/astro && pnpm playwright install chromium firefox && pnpm run test:e2e",
+    "test:e2e:match": "cd packages/astro && pnpm playwright install chromium firefox && pnpm run test:e2e:match",
     "test:e2e:hosts": "turbo run test:hosted",
     "benchmark": "astro-benchmark",
     "lint": "eslint . --report-unused-disable-directives",

packages/astro/package.json

@@ -112,8 +112,10 @@
     "postbuild": "astro-scripts copy \"src/**/*.astro\" && astro-scripts copy \"src/**/*.wasm\"",
     "test": "pnpm run test:node",
     "test:match": "pnpm run test:node --match",
-    "test:e2e": "playwright test",
+    "test:e2e": "pnpm test:e2e:chrome && pnpm test:e2e:firefox",
     "test:e2e:match": "playwright test -g",
+    "test:e2e:chrome": "playwright test",
+    "test:e2e:firefox": "playwright test --config playwright.firefox.config.js",
     "test:node": "astro-scripts test \"test/**/*.test.js\""
   },
   "dependencies": {

packages/astro/playwright.firefox.config.js

@@ -0,0 +1,43 @@
+// NOTE: Sometimes, tests fail with `TypeError: process.stdout.clearLine is not a function`
+// for some reason. This comes from Vite, and is conditionally called based on `isTTY`.
+// We set it to false here to skip this odd behavior.
+process.stdout.isTTY = false;
+
+const config = {
+	// TODO: add more tests like view transitions and audits, and fix them. Some of them are failing.
+	testMatch: ['e2e/css.test.js'],
+	/* Maximum time one test can run for. */
+	timeout: 40 * 1000,
+	expect: {
+		/**
+		 * Maximum time expect() should wait for the condition to be met.
+		 * For example in `await expect(locator).toHaveText();`
+		 */
+		timeout: 4 * 1000,
+	},
+	/* Fail the build on CI if you accidentally left test in the source code. */
+	forbidOnly: !!process.env.CI,
+	/* Retry on CI only */
+	retries: process.env.CI ? 3 : 0,
+	/* Opt out of parallel tests on CI. */
+	workers: 1,
+	/* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
+	use: {
+		/* Maximum time each action such as `click()` can take. Defaults to 0 (no limit). */
+		actionTimeout: 0,
+		/* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */
+		trace: 'on-first-retry',
+	},
+	projects: [
+		{
+			name: 'Firefox Stable',
+			use: {
+				browserName: 'firefox',
+				channel: 'firefox',
+				args: ['--use-gl=egl'],
+			},
+		},
+	],
+};
+
+export default config;