我怎样才能在 Flutter 测试中做到这一点

Question

我是 Flutter 测试的新手，希望您能帮助我。我有一个名为 AddShimmer 的 class，看起来像这样 ->

AddShimmer(
          child: ListTile(
            title: buildLoadingAnimation(context),
          ),
        ),

现在，我正在尝试编写一个 flutter 测试，以检查是否将子部件传递给 AddShimmer class。为此，我正在写这样的东西 ->

testWidgets('Shimmer has a child widget', (WidgetTester tester) async {
    const childWidget = ListTile(
      title: Text('Loading'),
    );
    await tester.pumpWidget(
     const AddShimmer(child: childWidget)
    );
    expect(find.byWidget(childWidget), findsOneWidget);
  });

当我执行测试时，我收到一个异常，显示 ->

The following assertion was thrown building ListTile(dirty):
No Directionality widget found.
ListTile widgets require a Directionality widget ancestor.
The specific widget that could not find a Directionality ancestor was:
  ListTile

这是什么意思以及如何测试它？？

Answer 1

基本上 flutter 需要一些额外的上下文才能呈现小部件。我通常只是将它包裹在 Scaffold 内 MaterialApp.

await tester.pumpWidget(
  const MaterialApp(
    home: Scaffold(
      body: AddShimmer(child: childWidget),
    ),
  ),
);

我怎样才能在 Flutter 测试中做到这一点

How can I do this in Flutter Testing

flutter

dart

testing

widget

widget-test-flutter