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// Copyright 2014 The Flutter 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/widgets.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('Empty GridView', (WidgetTester tester) async {
final List<Widget> children = <Widget>[
const DecoratedBox(decoration: BoxDecoration()),
const DecoratedBox(decoration: BoxDecoration()),
const DecoratedBox(decoration: BoxDecoration()),
const DecoratedBox(decoration: BoxDecoration()),
];
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Center(
child: Container(
width: 200.0,
child: GridView.extent(
maxCrossAxisExtent: 100.0,
shrinkWrap: true,
children: children,
),
),
),
),
);
expect(tester.renderObjectList<RenderBox>(find.byType(DecoratedBox)), hasLength(4));
for (final RenderBox box in tester.renderObjectList<RenderBox>(find.byType(DecoratedBox))) {
expect(box.size.width, equals(100.0), reason: 'child width');
expect(box.size.height, equals(100.0), reason: 'child height');
}
final RenderBox grid = tester.renderObject(find.byType(GridView));
expect(grid.size.width, equals(200.0), reason: 'grid width');
expect(grid.size.height, equals(200.0), reason: 'grid height');
expect(grid.debugNeedsLayout, false);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Center(
child: Container(
width: 200.0,
child: GridView.extent(
maxCrossAxisExtent: 60.0,
shrinkWrap: true,
children: children,
),
),
),
),
);
for (final RenderBox box in tester.renderObjectList<RenderBox>(find.byType(DecoratedBox))) {
expect(box.size.width, equals(50.0), reason: 'child width');
expect(box.size.height, equals(50.0), reason: 'child height');
}
expect(grid.size.width, equals(200.0), reason: 'grid width');
expect(grid.size.height, equals(50.0), reason: 'grid height');
});
}