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flutter_flutter/packages/flutter/test/widget/stack_test.dart
Ian Hickson 3252701753 Make it possible to run tests live on a device (#3936) 
This makes it possible to substitute 'flutter run' for 'flutter test'
and actually watch a test run on a device.

For any test that depends on flutter_test:

1. Remove any import of 'package:test/test.dart'.

2. Replace `testWidgets('...', (WidgetTester tester) {`
      with `testWidgets('...', (WidgetTester tester) async {`

3. Add an "await" in front of calls to any of the following:
    * tap()
    * tapAt()
    * fling()
    * flingFrom()
    * scroll()
    * scrollAt()
    * pump()
    * pumpWidget()

4. Replace any calls to `tester.flushMicrotasks()` with calls to
   `await tester.idle()`.

There's a guarding API that you can use, if you have particularly
complicated tests, to get better error messages. Search for
TestAsyncUtils.
2016-05-16 12:53:13 -07:00

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// Copyright 2015 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/rendering.dart';
import 'package:flutter/widgets.dart';
import '../rendering/rendering_tester.dart';
void main() {
testWidgets('Can construct an empty Stack', (WidgetTester tester) async {
await tester.pumpWidget(new Stack());
});
testWidgets('Can construct an empty Centered Stack', (WidgetTester tester) async {
await tester.pumpWidget(new Center(child: new Stack()));
});
testWidgets('Can change position data', (WidgetTester tester) async {
Key key = new Key('container');
await tester.pumpWidget(
new Stack(
children: <Widget>[
new Positioned(
left: 10.0,
child: new Container(
key: key,
width: 10.0,
height: 10.0
)
)
]
)
);
Element container;
StackParentData parentData;
container = tester.element(find.byKey(key));
parentData = container.renderObject.parentData;
expect(parentData.top, isNull);
expect(parentData.right, isNull);
expect(parentData.bottom, isNull);
expect(parentData.left, equals(10.0));
expect(parentData.width, isNull);
expect(parentData.height, isNull);
await tester.pumpWidget(
new Stack(
children: <Widget>[
new Positioned(
right: 10.0,
child: new Container(
key: key,
width: 10.0,
height: 10.0
)
)
]
)
);
container = tester.element(find.byKey(key));
parentData = container.renderObject.parentData;
expect(parentData.top, isNull);
expect(parentData.right, equals(10.0));
expect(parentData.bottom, isNull);
expect(parentData.left, isNull);
expect(parentData.width, isNull);
expect(parentData.height, isNull);
});
testWidgets('Can remove parent data', (WidgetTester tester) async {
Key key = new Key('container');
Container container = new Container(key: key, width: 10.0, height: 10.0);
await tester.pumpWidget(new Stack(children: <Widget>[ new Positioned(left: 10.0, child: container) ]));
Element containerElement = tester.element(find.byKey(key));
StackParentData parentData;
parentData = containerElement.renderObject.parentData;
expect(parentData.top, isNull);
expect(parentData.right, isNull);
expect(parentData.bottom, isNull);
expect(parentData.left, equals(10.0));
expect(parentData.width, isNull);
expect(parentData.height, isNull);
await tester.pumpWidget(new Stack(children: <Widget>[ container ]));
containerElement = tester.element(find.byKey(key));
parentData = containerElement.renderObject.parentData;
expect(parentData.top, isNull);
expect(parentData.right, isNull);
expect(parentData.bottom, isNull);
expect(parentData.left, isNull);
expect(parentData.width, isNull);
expect(parentData.height, isNull);
});
testWidgets('Can align non-positioned children', (WidgetTester tester) async {
Key child0Key = new Key('child0');
Key child1Key = new Key('child1');
await tester.pumpWidget(
new Center(
child: new Stack(
children: <Widget>[
new Container(key: child0Key, width: 20.0, height: 20.0),
new Container(key: child1Key, width: 10.0, height: 10.0)
],
alignment: const FractionalOffset(0.5, 0.5)
)
)
);
Element child0 = tester.element(find.byKey(child0Key));
final StackParentData child0RenderObjectParentData = child0.renderObject.parentData;
expect(child0RenderObjectParentData.offset, equals(const Offset(0.0, 0.0)));
Element child1 = tester.element(find.byKey(child1Key));
final StackParentData child1RenderObjectParentData = child1.renderObject.parentData;
expect(child1RenderObjectParentData.offset, equals(const Offset(5.0, 5.0)));
});
testWidgets('Can construct an empty IndexedStack', (WidgetTester tester) async {
await tester.pumpWidget(new IndexedStack());
});
testWidgets('Can construct an empty Centered IndexedStack', (WidgetTester tester) async {
await tester.pumpWidget(new Center(child: new IndexedStack()));
});
testWidgets('Can construct an IndexedStack', (WidgetTester tester) async {
int itemCount = 3;
List<int> itemsPainted;
Widget buildFrame(int index) {
itemsPainted = <int>[];
List<Widget> items = new List<Widget>.generate(itemCount, (int i) {
return new CustomPaint(
child: new Text('$i'),
painter: new TestCallbackPainter(
onPaint: () { itemsPainted.add(i); }
)
);
});
return new Center(child: new IndexedStack(children: items, index: index));
}
await tester.pumpWidget(buildFrame(0));
expect(find.text('0'), findsOneWidget);
expect(find.text('1'), findsOneWidget);
expect(find.text('2'), findsOneWidget);
expect(itemsPainted, equals(<int>[0]));
await tester.pumpWidget(buildFrame(1));
expect(itemsPainted, equals(<int>[1]));
await tester.pumpWidget(buildFrame(2));
expect(itemsPainted, equals(<int>[2]));
});
testWidgets('Can hit test an IndexedStack', (WidgetTester tester) async {
Key key = new Key('indexedStack');
int itemCount = 3;
List<int> itemsTapped;
Widget buildFrame(int index) {
itemsTapped = <int>[];
List<Widget> items = new List<Widget>.generate(itemCount, (int i) {
return new GestureDetector(child: new Text('$i'), onTap: () { itemsTapped.add(i); });
});
return new Center(child: new IndexedStack(children: items, key: key, index: index));
}
await tester.pumpWidget(buildFrame(0));
expect(itemsTapped, isEmpty);
await tester.tap(find.byKey(key));
expect(itemsTapped, <int>[0]);
await tester.pumpWidget(buildFrame(2));
expect(itemsTapped, isEmpty);
await tester.tap(find.byKey(key));
expect(itemsTapped, <int>[2]);
});
testWidgets('Can set width and height', (WidgetTester tester) async {
Key key = new Key('container');
BoxDecoration kBoxDecoration = new BoxDecoration(
backgroundColor: new Color(0xFF00FF00)
);
await tester.pumpWidget(
new Stack(
children: <Widget>[
new Positioned(
left: 10.0,
width: 11.0,
height: 12.0,
child: new DecoratedBox(key: key, decoration: kBoxDecoration)
)
]
)
);
Element box;
RenderBox renderBox;
StackParentData parentData;
box = tester.element(find.byKey(key));
renderBox = box.renderObject;
parentData = renderBox.parentData;
expect(parentData.top, isNull);
expect(parentData.right, isNull);
expect(parentData.bottom, isNull);
expect(parentData.left, equals(10.0));
expect(parentData.width, equals(11.0));
expect(parentData.height, equals(12.0));
expect(parentData.offset.dx, equals(10.0));
expect(parentData.offset.dy, equals(0.0));
expect(renderBox.size.width, equals(11.0));
expect(renderBox.size.height, equals(12.0));
await tester.pumpWidget(
new Stack(
children: <Widget>[
new Positioned(
right: 10.0,
width: 11.0,
height: 12.0,
child: new DecoratedBox(key: key, decoration: kBoxDecoration)
)
]
)
);
box = tester.element(find.byKey(key));
renderBox = box.renderObject;
parentData = renderBox.parentData;
expect(parentData.top, isNull);
expect(parentData.right, equals(10.0));
expect(parentData.bottom, isNull);
expect(parentData.left, isNull);
expect(parentData.width, equals(11.0));
expect(parentData.height, equals(12.0));
expect(parentData.offset.dx, equals(779.0));
expect(parentData.offset.dy, equals(0.0));
expect(renderBox.size.width, equals(11.0));
expect(renderBox.size.height, equals(12.0));
});
}
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