Flutter Driver - 如何知道哪个 "waitFor" 命令失败了？

Question

我正在使用 Flutter Driver 为我们的应用程序编写一些集成测试，我正在尝试使用 waitFor 命令等待元素出现。

该命令运行良好并等待我的元素，或者在找不到它时失败。我的问题是，当它失败时，控制台中的日志不会告诉我哪个 waitFor 调用失败了。

我运行，例如下面代码等待myButton1和myButton2：

Duration timeout = new Duration(seconds: 2);
await _driver.waitFor(myButton1, timeout: timeout);
await _driver.waitFor(myButton2, timeout: timeout);

但是，当我运行测试时，它们失败并显示以下错误消息：

00:04 +0 -1: Buttons shown when app is started [E]                                                                               
  DriverError: Error in Flutter application: Timeout while executing waitFor: TimeoutException after 0:00:02.000000: Future not completed
  
  
  package:flutter_driver/src/driver/vmservice_driver.dart 343:7  VMServiceFlutterDriver.sendCommand
  
00:04 +0 -1: Buttons (tearDownAll)                                                                                               [  +77 ms] test 0: process with pid 87459 no longer needed by test harness
[        ] test 0: cleaning up...
[        ] test 0: ensuring end-of-process for shell
[  +10 ms] test 0: deleting temporary directory
[   +4 ms] test 0: shutting down test harness socket server
[   +2 ms] test 0: finished
00:04 +0 -1: Some tests failed.                                                                                                            
[  +13 ms] Deleting /var/folders/xt/0fckrj2558746_v71h2vwqh00000gn/T/flutter_tools.WEuo76/flutter_test_compiler.u7VNn4...
[   +9 ms] killing pid 87444
[  +37 ms] Deleting /var/folders/xt/0fckrj2558746_v71h2vwqh00000gn/T/flutter_tools.WEuo76/flutter_test_fonts.FDpcXF...
[   +6 ms] test package returned with exit code 1
[  +13 ms] "flutter test" took 4,890ms.
[   +6 ms] 
           #0      throwToolExit (package:flutter_tools/src/base/common.dart:14:3)
           #1      TestCommand.runCommand (package:flutter_tools/src/commands/test.dart:292:7)
           <asynchronous suspension>
           #2      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:860:18)
           #3      _rootRunUnary (dart:async/zone.dart:1198:47)
           #4      _CustomZone.runUnary (dart:async/zone.dart:1100:19)
           #5      _FutureListener.handleValue (dart:async/future_impl.dart:143:18)
           #6      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:696:45)
           #7      Future._propagateToListeners (dart:async/future_impl.dart:725:32)
           #8      Future._completeWithValue (dart:async/future_impl.dart:529:5)
           #9      Future._asyncCompleteWithValue.<anonymous closure> (dart:async/future_impl.dart:567:7)
           #10     _rootRun (dart:async/zone.dart:1190:13)
           #11     _CustomZone.run (dart:async/zone.dart:1093:19)
           #12     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
           #13     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1037:23)
           #14     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
           #15     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
           #16     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
           #17     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:169:5)
           
           
[ +254 ms] ensureAnalyticsSent: 251ms
[   +1 ms] Running shutdown hooks
[        ] Shutdown hook priority 4
[        ] Shutdown hooks complete
[        ] exiting with code 1

此信息没有告诉我失败的是 myButton1 还是 myButton2。它也没有给我测试中的任何代码行来指示哪一行实际上有错误。

对此有什么想法吗？

Answer 1

我还没有想出是否有 built-in 方法可以做到这一点，但我写了一个辅助方法来获取我需要的信息：

  Future waitForObject(SerializableFinder object, Duration timeout, {String errorMessage = "waitForObject timed out"}) async {
    var message = "ERROR ==> $errorMessage";
    return await _driver.waitFor(object, timeout: timeout).catchError((e) { throw(message);});
  }

如果未找到对象，超时后仍会抛出错误，但它还会将我指向代码中导致超时的确切行。

Flutter Driver - 如何知道哪个 "waitFor" 命令失败了？

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