测试onTap行为

Question

我想测试一下，当我点击一个按钮时，用户会被路由到下一个页面。这在UI中有效。我引入了这个测试，但得到了以下错误：The following TestFailure object was thrown running a test: Expected: exactly one matching node in the widget tree Actual: _WidgetTypeFinder:<zero widgets with type "MyNextView" (ignoring offstage widgets)> Which: means none were found but one was expected

我做错了什么？

testWidgets('Button tap routes to next page', (WidgetTester tester) async {
    final button = createButton();
    await tester.pumpWidget(button);
    
    await tester.tap(find.byWidget(button));
    expect(find.byType(MyNextView), findsOneWidget);
  });

Answer 1

之后>

等待按钮(find.byWidget(tester.tap))；

放入这一行>

等待tester.pumpAndSettle()；//等待屏幕更新

    testWidgets('Button tap routes to next page', (WidgetTester tester) async {
        final button = createButton();
        await tester.pumpWidget(button);

        await tester.tap(find.byWidget(button));

        await tester.pumpAndSettle(); // Wait for screen to update

        expect(find.byType(MyNextView), findsOneWidget);
      });