在小部件测试中，如何执行 "pull-down" 手势？

Question

我正在使用 RefreshIndicator 小部件 - 用法如下所示：

RefreshIndicator(
  onRefresh: () => refreshState(), // Invokes a method on a state object that is mocked in my test
  child: ...

现在我想验证一下，“下拉”手势会导致调用 refreshState:

testWidgets('Pulling down triggers refresh', (tester) async {
    var state = MockState(); // Class extending Mock from mocktail
    ...
    // pump widget, providing state as a ChangeNotifierProvider
    ...

    // SomeWidget is a child in the widget under test and effective child of RefreshIndicator, it's center is positioned towards the top of the screen
    var gesture = await tester.startGesture(tester.getCenter(find.byType(SomeWidget)));
    await gesture.moveBy(Offset(0, 750));
    await tester.pump();

    verify(() => state.refresh());
  });

不幸的是，这会导致测试失败，表明未调用该方法：

══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following TestFailure object was thrown running a test:
  No matching calls (actually, no calls at all).
(If you called `verify(...).called(0);`, please instead use `verifyNever(...);`.)

编辑：

按照 Michael 的建议，使用 tester.drag 和 tester.pumpAndSettle 而不是 tester.pump 解决了问题

Answer 1

您可以使用flutter_test中的拖动方法。

API 文档在这里：https://api.flutter.dev/flutter/flutter_test/WidgetController/drag.html

用法示例：

await tester.drag(find.byKey(ValueKey("Your Key")), Offset(0, 500));

在小部件测试中，如何执行 "pull-down" 手势？

In widget tests, how can I perform a "pull-down" gesture?

flutter

dart

testing

gesture