Flaky Espresso 測試：啟動活動后測試失敗並超時

Question

啟動活動后，我的濃縮咖啡測試在 45 秒后超時失敗。

為了啟動活動，我使用InstrumentationRegistry.getInstrumentation().startActivitySync(intent) 。 盡管活動正確啟動，但測試在 45 秒后運行超時失敗。 這只是偶爾發生。

請注意，我的應用在啟動活動后立即通過OkHTTP獲取一些內容。 我也在使用像 Firebase 事件日志這樣的庫。 但是，我可以確認所有 OkHTTP 請求都在 2-3 秒內完成。

阻止 Espresso 完成測試的可能原因有哪些？ 我該如何調試這個問題？

以下是發生超時時的堆棧跟蹤：

  Thread[Jit thread pool worker thread 0,5,main]

  Thread[arch_disk_io_3,5,main]
    sun.misc.Unsafe.park(Native Method)
    java.util.concurrent.locks.LockSupport.park(LockSupport.java:190)
    java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2067)
    java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
    java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1092)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1152)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    java.lang.Thread.run(Thread.java:919)

  Thread[AsyncTask #1,5,main]
    sun.misc.Unsafe.park(Native Method)
    java.util.concurrent.locks.LockSupport.park(LockSupport.java:190)
    java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:459)
    java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:362)
    java.util.concurrent.SynchronousQueue.take(SynchronousQueue.java:920)
    java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1092)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1152)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    java.lang.Thread.run(Thread.java:919)

  Thread[Okio Watchdog,5,main]
    java.lang.Object.wait(Native Method)
    okio.AsyncTimeout.awaitTimeout(AsyncTimeout.java:361)
    okio.AsyncTimeout$Watchdog.run(AsyncTimeout.java:312)

  Thread[Timer-1,5,main]
    java.lang.Object.wait(Native Method)
    java.lang.Object.wait(Object.java:442)
    java.util.TimerThread.mainLoop(Timer.java:559)
    java.util.TimerThread.run(Timer.java:512)

  Thread[OkHttp ConnectionPool,5,main]
    java.lang.Object.wait(Native Method)
    com.android.okhttp.ConnectionPool$1.run(ConnectionPool.java:106)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    java.lang.Thread.run(Thread.java:919)

  Thread[RenderThread,7,main]

  Thread[HeapTaskDaemon,5,system]

  Thread[queued-work-looper,5,main]
    android.os.MessageQueue.nativePollOnce(Native Method)
    android.os.MessageQueue.next(MessageQueue.java:336)
    android.os.Looper.loop(Looper.java:174)
    android.os.HandlerThread.run(HandlerThread.java:67)

  Thread[hwuiTask1,6,main]

  Thread[ReferenceQueueDaemon,5,system]
    java.lang.Object.wait(Native Method)
    java.lang.Object.wait(Object.java:442)
    java.lang.Object.wait(Object.java:568)
    java.lang.Daemons$ReferenceQueueDaemon.runInternal(Daemons.java:215)
    java.lang.Daemons$Daemon.run(Daemons.java:137)
    java.lang.Thread.run(Thread.java:919)

  Thread[pool-1-thread-1,5,main]
    sun.misc.Unsafe.park(Native Method)
    java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:230)
    java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2109)
    java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1132)
    java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:849)
    java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1092)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1152)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    java.lang.Thread.run(Thread.java:919)

  Thread[OkHttp ConnectionPool,5,main]
    java.lang.Object.wait(Native Method)
    okhttp3.ConnectionPool$1.run(ConnectionPool.java:67)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    java.lang.Thread.run(Thread.java:919)

  Thread[pool-5-thread-2,5,main]
    sun.misc.Unsafe.park(Native Met

E/TestRunner: failed: registerWithoutUI(com.myapp.RegistrationTests) ----- 開始異常 ----- E/TestRunner: java.lang.RuntimeException: 無法啟動 Intent Intent { act=android.intent.action. MAIN flg=0x14000000 cmp=com.myapp/com.myapp.navigation.StartupActivity } 在 45000 秒內。 也許主線程在合理的時間內沒有空閑？ 可能有 animation 或不斷重繪屏幕的東西。 或者活動是在創建時進行網絡調用？ 請參閱線程轉儲日志。 供您參考，在您的活動啟動請求之前事件隊列最后一次空閑是 1571388177991，現在隊列最后一次空閑是：1571388191468。如果這些數字相同，您的活動可能會占用事件隊列。 at androidx.test.runner.MonitoringInstrumentation.startActivitySync(MonitoringInstrumentation.java:483) at com.myapp.TestUtilKt.launchActivity(TestUtil.kt:25) at com.myapp.RobotKitKt.launchStartupActivity(RobotKit.kt:18) at com. myappe.RobotKitKt.precondition_new_registration(RobotKit.kt:163) at com.myapp.RegistrationTests.registerWithoutUI(RegistrationTests.kt:48) at java.lang.reflect.Method.invoke(Native Method) at org.junit.runners.model. FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runner s.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at androidx.test.internal.runner.junit4.statement.RunBefores. evaluate(RunBefores.java:80) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner .runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(Pa rentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2 .evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at androidx.test.ext.junit.runners.AndroidJUnit4.run(AndroidJUnit4.java:104) at org. junit.runners.Suite.runChild(Suite.java:128) at org.junit.runners.Suite.runChild(Suite.java:27) at org.junit.runners.ParentRunner$3.run(ParentRunner.Z93F725A07 423FE1C889F448B33D21F46Z:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000 (ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.junit.runner.JUnitCore .run(JUnitCore.java:137) at org.junit.runner.JUnitCore.run(JUnitCore.java:115) at androidx.test.internal.runner.TestExecutor.execute(TestExecutor.java:56) at androidx .test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:392) at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:2189) ----- end exception -----

Answer 1

我現在可以通過在我的前置條件代碼中的幾個地方插入Thread.sleep()來解決這個問題（在啟動被測活動之前）。

我希望我有時間深入研究 Espresso 來幫助解決所有這些問題。