add app dev tests

packages/e2e/tests/app-dev-server.spec.ts

@@ -0,0 +1,41 @@
+import {appScaffoldFixture as test} from '../fixtures/app-scaffold.js'
+import {requireEnv} from '../fixtures/env.js'
+import {expect} from '@playwright/test'
+
+test.describe('App dev server @phase2', () => {
+  test('dev starts, shows ready message, and quits with q', async ({appScaffold, cli, env}) => {
+    requireEnv(env, 'partnersToken', 'clientId', 'storeFqdn')
+
+    // Step 1: Create an app
+    const initResult = await appScaffold.init({
+      template: 'reactRouter',
+      flavor: 'javascript',
+      packageManager: 'npm',
+    })
+    expect(initResult.exitCode).toBe(0)
+
+    // Step 2: Start dev server via PTY
+    // Unset CI so keyboard shortcuts are enabled in the Dev UI
+    const dev = await cli.spawn(
+      [
+        'app', 'dev',
+        '--path', appScaffold.appDir,
+      ],
+      {env: {CI: ''}},
+    )
+
+    // Step 3: Wait for the ready message
+    await dev.waitForOutput('Ready, watching for changes in your app', 3 * 60 * 1000)
+
+    // Step 4: Verify keyboard shortcuts are shown (indicates TTY mode is working)
+    const output = dev.getOutput()
+    expect(output).toContain('q')
+
+    // Step 5: Press q to quit
+    dev.sendKey('q')
+
+    // Step 6: Wait for clean exit
+    const exitCode = await dev.waitForExit(30_000)
+    expect(exitCode).toBe(0)
+  })
+})