fix(install-e2e): wait for Electron close before driver exit

tests-js/install-process-close.test.ts

@@ -0,0 +1,33 @@
+import { EventEmitter } from 'node:events'
+import { createRequire } from 'node:module'
+
+import { expect, it, vi } from 'vitest'
+
+const { observeProcessClose } = createRequire(import.meta.url)('../tests/install/e2e-assets/process-close.cjs')
+
+it('waits for native close, not exit, and retains a close observed before hand-off', async () => {
+  const child = new EventEmitter()
+  const waitForClose = observeProcessClose(child)
+  let finished = false
+  const completion = waitForClose().then(() => { finished = true })
+  child.emit('exit', 0)
+  await Promise.resolve()
+  expect(finished).toBe(false)
+  child.emit('close', 0)
+  await completion
+  expect(finished).toBe(true)
+  await expect(waitForClose()).resolves.toBeUndefined()
+})
+
+it('fails if the launched process never closes', async () => {
+  vi.useFakeTimers()
+  try {
+    const waitForClose = observeProcessClose(new EventEmitter())
+    const completion = expect(waitForClose(2_000)).rejects.toThrow('Electron process did not close')
+    await vi.advanceTimersByTimeAsync(2_000)
+    await completion
+    expect(vi.getTimerCount()).toBe(0)
+  } finally {
+    vi.useRealTimers()
+  }
+})

tests/install/e2e-assets/drive-update.cjs

@@ -21,6 +21,7 @@ const fs = require('node:fs')
 
 const { _electron } = require('@playwright/test')
 const { prepareWindowForInput } = require('./window-input.cjs')
+const { observeProcessClose } = require('./process-close.cjs')
 
 const exePath = process.argv[2]
 const proofDir = process.argv[3]
@@ -93,6 +94,9 @@ async function main() {
     env: { ...process.env },
     timeout: 120_000
   })
+  const child = app.process()
+  const waitForProcessClose = observeProcessClose(child)
+  log(`launched Electron pid=${child.pid}`)
 
   // firstWindow() can grab a helper webContents (wake indicator etc.), not
   // the main app window. Pick the window that actually renders UI (has a
@@ -255,7 +259,8 @@ async function main() {
   // The "Updating Hermes — this window will close" overlay should appear,
   // then the app quits (hand-off dwell). Screenshot the overlay while the
   // window is still alive.
-  await page.waitForTimeout(1200)
+  // The app can close during the dwell. This wait must outlive its page.
+  await new Promise(resolve => setTimeout(resolve, 1200))
   await shot(page, '05-updating-overlay')
 
   // ── Wait for the hand-off to take over ────────────────────────────────
@@ -315,7 +320,10 @@ async function main() {
     throw new Error('no hand-off within 150s of Update now (no marker, no result, app still alive)')
   }
 
-  log('hand-off confirmed — detached updater owns the rest')
+  // A marker appears before Electron exits. Exiting this driver at that point
+  // lets Playwright taskkill the entire tree, including the detached updater.
+  await waitForProcessClose()
+  log('Electron process closed — detached updater owns the rest')
 }
 
 main()

tests/install/e2e-assets/process-close.cjs

@@ -0,0 +1,25 @@
+// Observe at launch: a renderer can close before the native process and its
+// stdio pipes. Playwright's driver exit cleanup tree-kills until that close.
+function observeProcessClose(child) {
+  let closed = false
+  const completion = new Promise(resolve => child.once('close', () => {
+    closed = true
+    resolve()
+  }))
+  return async function waitForClose(timeoutMs = 120_000) {
+    if (closed) return
+    let timer
+    try {
+      await Promise.race([
+        completion,
+        new Promise((_, reject) => {
+          timer = setTimeout(() => reject(new Error('Electron process did not close after update hand-off')), timeoutMs)
+        }),
+      ])
+    } finally {
+      clearTimeout(timer)
+    }
+  }
+}
+
+module.exports = { observeProcessClose }

tests/install/windows-e2e.ps1

@@ -763,6 +763,7 @@ function Invoke-GuiUpdateDesktopRoute([string]$TargetSha) {
         $driver = Join-Path $driverDir "e2e-drive-update.cjs"
         Copy-Item (Join-Path $AssetsDir "drive-update.cjs") $driver -Force
         Copy-Item (Join-Path $AssetsDir "window-input.cjs") (Join-Path $driverDir "window-input.cjs") -Force
+        Copy-Item (Join-Path $AssetsDir "process-close.cjs") (Join-Path $driverDir "process-close.cjs") -Force
         Push-Location $driverDir
         $prevEap = $ErrorActionPreference
         $ErrorActionPreference = "Continue"