在颤振测试中模拟悬停答案

【问题标题】：Simulate hover in flutter test在颤振测试中模拟悬停
【发布时间】：2021-05-21 00:04:43
【问题描述】：

我正在开发一个 Flutter Web 项目，并且我有一个小部件想要编写测试。这个小部件使用MouseRegion，当它被用户悬停或不悬停时，它会执行一些操作。

举个例子：


class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  bool isHovered = false;
  @override
  Widget build(BuildContext context) {
    return MouseRegion(
      onExit: (_) {
        setState(() {
          isHovered = false;
        });
      },
      onEnter: (_) {
        setState(() {
          isHovered = true;
        });
      },
      child: Container(
        color: isHovered ? Colors.blue : Colors.red,
        height: 50,
        width: 50,
      )
    );
  }
}

我可以写一个小部件测试来测试我的容器是红色的：

testWidgets('MyWidget should be red by default', (WidgetTester tester) async {
  await tester.pumpWidget(
    MyWidget(),
  );
  expect(find.byWidgetPredicate((Widget widget) => widget is Container && widget.color == Colors.red), findsOneWidget);
  expect(find.byWidgetPredicate((Widget widget) => widget is Container && widget.color == Colors.blue), findsNothing);
});

但是如何在测试小部件中模拟悬停（以检查容器是否为蓝色）？

【问题讨论】：

相信这条评论能给你一个方向。 stackoverflow.com/a/64450668/10136855
感谢您的建议，我尝试添加 final offset = tester.getCenter(find.byType(MyWidget)); final testPointer = TestPointer(1, PointerDeviceKind.mouse)..hover(offset); await tester.pumpAndSettle(); 和 await tester.sendEventToBinding(testPointer.scroll(const Offset(0, 0)));，但不幸的是没有成功
await tester.sendEventToBinding(testPointer.scroll(const Offset(0, 0))); 用于滚动。我认为悬停功能是答案，但不是。请尝试环顾这个颤振测试以找到答案github.com/flutter/flutter/blob/master/packages/flutter/test/…

标签： flutter dart hover flutter-test widget-test-flutter

【解决方案1】：

这就是我如何做到的

testWidgets('MyWidget should be red by default', (WidgetTester tester) async {
  await tester.pumpWidget(
    MyWidget(),
  );
  expect(find.byWidgetPredicate((Widget widget) => widget is Container && widget.color == Colors.red), findsOneWidget);
  expect(find.byWidgetPredicate((Widget widget) => widget is Container && widget.color == Colors.blue), findsNothing);

  final gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
  await gesture.addPointer(location: Offset.zero);
  addTearDown(gesture.removePointer);
  await tester.pump();
  await gesture.moveTo(tester.getCenter(find.byType(MyWidget)));
  await tester.pumpAndSettle();

  expect(find.byWidgetPredicate((Widget widget) => widget is Container && widget.color == Colors.red), findsNothing);
  expect(find.byWidgetPredicate((Widget widget) => widget is Container && widget.color == Colors.blue), findsOneWidget);
});

【讨论】：