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Add tests for ScrollController assertions (#8499)

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Ensure that read and write operations fail on ScrollControllers
associated with a number of positions other than 1.
This commit is contained in:
Chris Bracken 2017-03-01 11:18:43 -08:00 committed by GitHub
parent 0b7845a5ac
commit 9f92f7928e
1 changed files with 69 additions and 0 deletions
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69
packages/flutter/test/widgets/scroll_controller_test.dart
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@ -160,4 +160,73 @@ void main() {
await tester.pumpWidget(new Container(), const Duration(seconds: 2));
});
testWidgets('Read operations on ScrollControllers with no positions fail', (WidgetTester tester) async {
ScrollController controller = new ScrollController();
expect(() => controller.offset, throwsAssertionError);
expect(() => controller.position, throwsAssertionError);
});
testWidgets('Read operations on ScrollControllers with more than one position fail', (WidgetTester tester) async {
ScrollController controller = new ScrollController();
await tester.pumpWidget(new ListView(
children: <Widget>[
new Container(
constraints: const BoxConstraints(maxHeight: 500.0),
child: new ListView(
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(height: 200.0, child: new Text(state));
}).toList(),
),
),
new Container(
constraints: const BoxConstraints(maxHeight: 500.0),
child: new ListView(
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(height: 200.0, child: new Text(state));
}).toList(),
),
),
],
));
expect(() => controller.offset, throwsAssertionError);
expect(() => controller.position, throwsAssertionError);
});
testWidgets('Write operations on ScrollControllers with no positions fail', (WidgetTester tester) async {
ScrollController controller = new ScrollController();
expect(() => controller.animateTo(1.0, duration: const Duration(seconds: 1), curve: Curves.linear), throwsAssertionError);
expect(() => controller.jumpTo(1.0), throwsAssertionError);
});
testWidgets('Write operations on ScrollControllers with more than one position fail', (WidgetTester tester) async {
ScrollController controller = new ScrollController();
await tester.pumpWidget(new ListView(
children: <Widget>[
new Container(
constraints: const BoxConstraints(maxHeight: 500.0),
child: new ListView(
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(height: 200.0, child: new Text(state));
}).toList(),
),
),
new Container(
constraints: const BoxConstraints(maxHeight: 500.0),
child: new ListView(
controller: controller,
children: kStates.map<Widget>((String state) {
return new Container(height: 200.0, child: new Text(state));
}).toList(),
),
),
],
));
expect(() => controller.jumpTo(1.0), throwsAssertionError);
expect(() => controller.animateTo(1.0, duration: const Duration(seconds: 1), curve: Curves.linear), throwsAssertionError);
});
}