fix(test): prevent expensive setup in beforeAll when test will be skipped

On platforms where Puppeteer is unsupported (Linux arm64, Windows CI),
the beforeAll hooks were still running expensive operations like
`bun install` and copying files, causing timeouts.

Changes:
- Move skip condition check to top of file
- Add early return in beforeAll hooks when test will be skipped
- Disable Puppeteer pipe mode on macOS to prevent flaky
  "TargetCloseError: Protocol error (Target.setDiscoverTargets)" errors

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

test/integration/next-pages/test/dev-server-puppeteer.ts

@@ -1,9 +1,9 @@
 import assert from "assert";
+import { which } from "bun";
 import { copyFileSync } from "fs";
 import { join } from "path";
 import type { ConsoleMessage, Page } from "puppeteer";
 import { launch } from "puppeteer";
-import { which } from "bun";
 const root = join(import.meta.dir, "../");
 
 copyFileSync(join(root, "src/Counter1.txt"), join(root, "src/Counter.tsx"));
@@ -25,7 +25,8 @@ const b = await launch({
   // Inherit the stdout and stderr of the browser process.
   dumpio: true,
   // Prefer to use a pipe to connect to the browser, instead of a WebSocket.
-  pipe: true,
+  // On macOS, pipe mode can cause "TargetCloseError: Protocol error (Target.setDiscoverTargets): Target closed"
+  pipe: process.platform !== "darwin",
   // Disable timeouts.
   timeout: 0,
   protocolTimeout: 0,

test/integration/next-pages/test/dev-server.test.ts

@@ -10,9 +10,18 @@ const { parseLockfile } = install_test_helpers;
 
 expect.extend({ toMatchNodeModulesAt });
 
+// Chrome for Testing doesn't support arm64 yet
+// https://github.com/GoogleChromeLabs/chrome-for-testing/issues/1
+// https://github.com/puppeteer/puppeteer/issues/7740
+const puppeteer_unsupported = process.platform === "linux" && process.arch === "arm64";
+
+// https://github.com/oven-sh/bun/issues/11255
+const shouldSkip = puppeteer_unsupported || (isWindows && isCI);
+
 let root = tmpdirSync();
 
 beforeAll(async () => {
+  if (shouldSkip) return;
   await rm(root, { recursive: true, force: true });
   await cp(join(import.meta.dir, "../"), root, { recursive: true, force: true });
   await rm(join(root, ".next"), { recursive: true, force: true });
@@ -86,6 +95,7 @@ async function getDevServerURL() {
 }
 
 beforeAll(async () => {
+  if (shouldSkip) return;
   copyFileSync(join(root, "src/Counter1.txt"), join(root, "src/Counter.tsx"));
 
   const install = Bun.spawnSync([bunExe(), "i"], {
@@ -116,14 +126,7 @@ afterAll(() => {
   }
 });
 
-// Chrome for Testing doesn't support arm64 yet
-//
-// https://github.com/GoogleChromeLabs/chrome-for-testing/issues/1
-// https://github.com/puppeteer/puppeteer/issues/7740
-const puppeteer_unsupported = process.platform === "linux" && process.arch === "arm64";
-
-// https://github.com/oven-sh/bun/issues/11255
-test.skipIf(puppeteer_unsupported || (isWindows && isCI))(
+test.skipIf(shouldSkip)(
   "hot reloading works on the client (+ tailwind hmr)",
   async () => {
     expect(dev_server).not.toBeUndefined();