Flutter测试无尾错误错误：键入＆＃x27; null＆＃x27;类型的子类型不是Future＆lt; object？＆gt;＆＃x27;

Question

我想测试当按钮10次时是否按下路线。当测试的小部件调用modular.to.pushnamed（）方法时，将以下错误丢弃了

The following _TypeError was thrown running a test:
type 'Null' is not a subtype of type 'Future<Object?>'

When the exception was thrown, this was the stack:
#0      ModularNavigateMock.pushNamed (package:flutter_modular/src/presenter/models/modular_navigator.dart:40:14)
#1      AgileSmellsState.goToResults (package:serious_agile_games/agile-smells/agile_smells.dart:37:16)
#2      AgileSmellsState.build.<anonymous closure> (package:serious_agile_games/agile-smells/agile_smells.dart:50:26)
#3      SwipingDeck.swipeRight (package:swiping_card_deck/swiping_card_deck.dart:119:38)
<asynchronous suspension>

呼叫，将异常抛出agileamells widget widget in

void goToResults() {
    Modular.to.pushNamed(AgileSmellsResults.route, arguments: validatedSmells);
  }

vardicatedsmells是一个不可nulable list.Empty（growable：true）

我的测试是

testWidgets('Test validate smell 10 times', (tester) async {
      await tester.pumpWidget(TestModularApp(widgetToTest: AgileSmells(firestore: firestore)));

      await tester.pumpAndSettle();

      final deck = find.byType(SwipingDeck<SmellCard>);
      final validateButton = find.byIcon(Icons.check);

      expect(deck, findsOneWidget);
      expect(validateButton, findsOneWidget);

      await tester.tap(validateButton);
      await tester.pumpAndSettle();
      verifyNever(
        () => TestModularNavigation.mockedNavigator.pushNamed(AgileSmellsResults.route, arguments: any, forRoot: false),
      );

      for (int i = 1; i < 10; i++) {
        await tester.tap(validateButton);
        await tester.pumpAndSettle();
      }
      // Verify causing failure in the test
      verify(
        () => TestModularNavigation.mockedNavigator.pushNamed(AgileSmellsResults.route, arguments: any, forRoot: false),
      ).called(1); 
    });

我模拟的ModularNavigate类，

class ModularNavigateMock extends Mock implements IModularNavigator {}

class TestModularNavigation {
  static final mockedNavigator = ModularNavigateMock();

  static void setUp() {
    Modular.navigatorDelegate = mockedNavigator;
    when(() => mockedNavigator.pushNamed(AgileSmellsResults.route, arguments: any)).thenAnswer((_) async => const AgileSmellsResults());
  }
}

谢谢您帮助我

Answer 1

通过阅读“ noreferrer”>“ noreflow noreferrer”> oilbtail faq和pub.dev上的文档

这个问题是错误的问题。代码>推名方法。我更改了参数： by 参数：any（ney（naty：'grauments'）在我的mockednavigator和verify> verify < /代码>步骤

我的修复MockedNavigator

class ModularNavigateMock extends Mock implements IModularNavigator {}

class TestModularNavigation {
  static final mockedNavigator = ModularNavigateMock();

  static void setUp() {
    Modular.navigatorDelegate = mockedNavigator;
    when(() => mockedNavigator.pushNamed(AgileSmellsResults.route, arguments: any(named: 'arguments'))).thenAnswer((_) async => const AgileSmellsResults(validatedSmellCards: []));
  }
}