我有一个带有 ScrollController 的 ListView.builder,如下所示:
_buildListView(state) => ListView.builder(
itemBuilder: (_, int index) => _draw(index, state),
itemCount: state.count
controller: _scrollController,
);
我向控制器添加了一个监听器:
View() {
_scrollController.addListener(_onScroll);
}
我想测试_onScroll函数:
void _onScroll() {
final maxScroll = _scrollController.position.maxScrollExtent;
final currentScroll = _scrollController.position.pixels;
if (maxScroll - currentScroll <= _scrollThreshold) {
_bloc.dispatch(Fetch());
}
}
但是我不知道如何测试它。目前为止,这是我尝试过的:
testWidgets('Should test the scroll',
(WidgetTester tester) async {
await tester.pumpWidget(generateApp());
await tester.pump();
await tester.drag(find.byType(ListView), const Offset(0.0, -300));
await tester.pump();
...
)}
但它根本没有调用那个函数。