blob: b2ecbfbf5903595db55cc445efe29199689103f7 [file] [log] [blame]
// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/widgets.dart';
void main() {
testWidgets('ListView.builder() fixed itemExtent, scroll to end, append, scroll', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/9506
Widget buildFrame(int itemCount) {
return new Directionality(
textDirection: TextDirection.ltr,
child: new ListView.builder(
itemExtent: 200.0,
itemCount: itemCount,
itemBuilder: (BuildContext context, int index) => new Text('item $index'),
),
);
}
await tester.pumpWidget(buildFrame(3));
expect(find.text('item 0'), findsOneWidget);
expect(find.text('item 1'), findsOneWidget);
expect(find.text('item 2'), findsOneWidget);
await tester.pumpWidget(buildFrame(4));
expect(find.text('item 3'), findsNothing);
final TestGesture gesture = await tester.startGesture(const Offset(0.0, 300.0));
await gesture.moveBy(const Offset(0.0, -200.0));
await tester.pumpAndSettle();
expect(find.text('item 3'), findsOneWidget);
});
testWidgets('ListView.builder() fixed itemExtent, scroll to end, append, scroll', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/9506
Widget buildFrame(int itemCount) {
return new Directionality(
textDirection: TextDirection.ltr,
child: new ListView.builder(
itemCount: itemCount,
itemBuilder: (BuildContext context, int index) {
return new SizedBox(
height: 200.0,
child: new Text('item $index'),
);
},
),
);
}
await tester.pumpWidget(buildFrame(3));
expect(find.text('item 0'), findsOneWidget);
expect(find.text('item 1'), findsOneWidget);
expect(find.text('item 2'), findsOneWidget);
await tester.pumpWidget(buildFrame(4));
final TestGesture gesture = await tester.startGesture(const Offset(0.0, 300.0));
await gesture.moveBy(const Offset(0.0, -200.0));
await tester.pumpAndSettle();
expect(find.text('item 3'), findsOneWidget);
});
}