Flutter 小部件测试 - 等待 Future 完成

Question

我在 flutter 中有一个 widget 测试，可以抽取被测 widget，当它打开时，执行后台操作 (staticWrapper.requestPermission())，该操作返回 Future 并根据其结果设置状态。问题是测试没有等待这个 future 完成，测试代码:

/// When micro permission denied, should show error message.
testWidgets('When micro permission denied, should show error message.',
    (WidgetTester tester) async {
  when(staticWrapper.requestPermission(Permission.RecordAudio))
      .thenAnswer((_) => Future.value(PermissionStatus.denied));
  await tester.pumpWidget(widget);
  final loginText = find.text(callScreen_microPermissionDenied);
  expect(loginText, findsOneWidget);
});

受影响的小部件代码:

void _requestMicroPermission() async {
final result =
    await staticWrapper.requestPermission(Permission.RecordAudio);
debugPrint("Microphone permission status: $result");
if (result == PermissionStatus.authorized) {
  native.init();
} else {
  setState(() {
    _loginText = tnsManager.getText(TranslationsManager.callScreen_microPermissionDenied);
  });
}

expect() 方法在 setState() 调用之前被调用。

有什么帮助吗？

Answer 1

最后我使用 WidgetTester#pumpAndSettle() 解决了这个问题:

testWidgets('When micro permission denied, should show error message.',
    (WidgetTester tester) async {
  when(staticWrapper.requestPermission(Permission.RecordAudio))
      .thenAnswer((_) => Future.value(PermissionStatus.denied));
  await tester.pumpWidget(widget);
  await tester.pump();
  final loginText = find.text(callScreen_microPermissionDenied);
  expect(loginText, findsOneWidget);
});