Flutter 集成测试中的 lineMatch 断言错误

Question

我经常遇到以下错误，尽管它不一致而且我无法弄清楚原因。 我正在按照 Flutter 集成测试的说明使用测试仪。

测试代码：

testWidgets('should create and save simulation', (tester) async {
      await startApp(tester, app);
      await login(tester);

      await navigateTo(NavPage.SIMULATOR, tester);
      String scenarioName = "CreateAndSaveScenario";
      await createScenario(scenarioName, tester);
      expect(find.text("CRQ Simulator"), findsWidgets);
      expect(find.text("Edit Scenario"), findsWidgets);
      expect(find.text(scenarioName), findsWidgets);

      Finder fairSwitchFinder = find.byType(Switch);
      tester.tap(fairSwitchFinder);

      await navigateTo(NavPage.SIMULATOR, tester);

      expect(find.byType(ListTile), findsOneWidget);
      expect(find.text(scenarioName), findsOneWidget);
    });

错误：

══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞═════════════════
The following assertion was thrown running a test:
Assertion failed:
file:///C:/Users/jared/dev/flutter/packages/flutter_test/lib/src/test_async_utils.dart:315:14
lineMatch != null
is not true

When the exception was thrown, this was the stack:
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 266:49  throw_
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 29:3    assertFailed
packages/flutter_test/src/test_async_utils.dart 315:23                                                                     _findResponsibleMethod
packages/flutter_test/src/test_async_utils.dart 198:42                                                                     guardSync
packages/flutter_test/src/widget_tester.dart 459:18                                                                        expect$
views/simulator/crq_simulator_test.dart 37:7                                                                               <fn>
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 45:50            <fn>
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1399:47                                          _rootRunUnary
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1300:19                                          runUnary
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 147:18                                    handleValue
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 766:44                                    handleValueCallback
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 795:13                                    _propagateToListeners
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 566:5                                     [_completeWithValue]
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/future_impl.dart 639:7                                     <fn>
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1391:13                                          _rootRun
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1293:19                                          run
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1201:7                                           runGuarded
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/zone.dart 1241:23                                          callback
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/schedule_microtask.dart 40:11                              _microtaskLoop
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/async/schedule_microtask.dart 49:5                               _startMicrotaskLoop
C:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 166:15           <fn>

The test description was:
  should create and save simulation
═════════════════════════════════════════════════════════════════

end of failure 1

我期待测试仪导航，但在 fairSwitchFinder 点击之后，它似乎无法做任何事情，因为 lineMatch 是 null？ 错误描述性不强

Answer 1

好吧，我后来很快就想通了。 很惊讶没有任何答案，但希望这个问题现在出现在搜索中。

我错过了await 。

我改变了tester.tap(fairSwitchFinder); await tester.tap(fairSwitchFinder); 它修复了它。