Add tests for stream_builder.0.dart API example. (#147832)
This PR contributes to https://github.com/flutter/flutter/issues/130459 ### Description - Updates `examples/api/lib/widgets/async/stream_builder.0.dart` - Adds test for `examples/api/lib/widgets/async/stream_builder.0.dart`
This commit is contained in:
Kostia Sokolovskyi
GitHub
parent
1128eabec6
commit
456d176a70
@ -405,7 +405,6 @@ final Set<String> _knownMissingTests = <String>{
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'examples/api/test/widgets/nested_scroll_view/nested_scroll_view.0_test.dart',
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'examples/api/test/widgets/scroll_position/scroll_metrics_notification.0_test.dart',
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'examples/api/test/widgets/media_query/media_query_data.system_gesture_insets.0_test.dart',
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'examples/api/test/widgets/async/stream_builder.0_test.dart',
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'examples/api/test/widgets/async/future_builder.0_test.dart',
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'examples/api/test/widgets/restoration_properties/restorable_value.0_test.dart',
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'examples/api/test/widgets/animated_size/animated_size.0_test.dart',
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@ -13,34 +13,54 @@ void main() => runApp(const StreamBuilderExampleApp());
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class StreamBuilderExampleApp extends StatelessWidget {
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const StreamBuilderExampleApp({super.key});
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static const Duration delay = Duration(seconds: 1);
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@override
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Widget build(BuildContext context) {
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return const MaterialApp(
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home: StreamBuilderExample(),
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home: StreamBuilderExample(delay: delay),
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);
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}
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}
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class StreamBuilderExample extends StatefulWidget {
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const StreamBuilderExample({super.key});
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const StreamBuilderExample({
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required this.delay,
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super.key,
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});
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final Duration delay;
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@override
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State<StreamBuilderExample> createState() => _StreamBuilderExampleState();
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}
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class _StreamBuilderExampleState extends State<StreamBuilderExample> {
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final Stream<int> _bids = (() {
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late final StreamController<int> controller;
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controller = StreamController<int>(
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onListen: () async {
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await Future<void>.delayed(const Duration(seconds: 1));
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controller.add(1);
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await Future<void>.delayed(const Duration(seconds: 1));
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await controller.close();
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},
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);
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return controller.stream;
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})();
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late final StreamController<int> _controller = StreamController<int>(
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onListen: () async {
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await Future<void>.delayed(widget.delay);
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if (!_controller.isClosed) {
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_controller.add(1);
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}
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await Future<void>.delayed(widget.delay);
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if (!_controller.isClosed) {
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_controller.close();
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}
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},
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);
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Stream<int> get _bids => _controller.stream;
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@override
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void dispose() {
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if (!_controller.isClosed) {
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_controller.close();
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}
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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@ -50,86 +70,108 @@ class _StreamBuilderExampleState extends State<StreamBuilderExample> {
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child: Container(
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alignment: FractionalOffset.center,
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color: Colors.white,
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child: StreamBuilder<int>(
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stream: _bids,
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builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
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List<Widget> children;
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if (snapshot.hasError) {
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children = <Widget>[
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const Icon(
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Icons.error_outline,
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color: Colors.red,
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size: 60,
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),
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Padding(
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padding: const EdgeInsets.only(top: 16),
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child: Text('Error: ${snapshot.error}'),
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),
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Padding(
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padding: const EdgeInsets.only(top: 8),
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child: Text('Stack trace: ${snapshot.stackTrace}'),
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),
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];
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} else {
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switch (snapshot.connectionState) {
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case ConnectionState.none:
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children = const <Widget>[
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Icon(
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Icons.info,
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color: Colors.blue,
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size: 60,
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),
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Padding(
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padding: EdgeInsets.only(top: 16),
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child: Text('Select a lot'),
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),
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];
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case ConnectionState.waiting:
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children = const <Widget>[
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SizedBox(
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width: 60,
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height: 60,
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child: CircularProgressIndicator(),
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),
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Padding(
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padding: EdgeInsets.only(top: 16),
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child: Text('Awaiting bids...'),
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),
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];
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case ConnectionState.active:
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children = <Widget>[
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const Icon(
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Icons.check_circle_outline,
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color: Colors.green,
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size: 60,
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),
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Padding(
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padding: const EdgeInsets.only(top: 16),
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child: Text('\$${snapshot.data}'),
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),
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];
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case ConnectionState.done:
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children = <Widget>[
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const Icon(
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Icons.info,
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color: Colors.blue,
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size: 60,
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),
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Padding(
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padding: const EdgeInsets.only(top: 16),
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child: Text('\$${snapshot.data} (closed)'),
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),
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];
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}
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}
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return Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: children,
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);
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},
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),
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child: BidsStatus(bids: _bids),
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),
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);
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}
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}
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class BidsStatus extends StatelessWidget {
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const BidsStatus({
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required this.bids,
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super.key,
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});
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final Stream<int>? bids;
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@override
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Widget build(BuildContext context) {
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return StreamBuilder<int>(
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stream: bids,
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builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
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List<Widget> children;
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if (snapshot.hasError) {
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children = <Widget>[
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const Icon(
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Icons.error_outline,
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color: Colors.red,
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size: 60,
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),
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Padding(
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padding: const EdgeInsets.only(top: 16),
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child: Text('Error: ${snapshot.error}'),
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),
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Padding(
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padding: const EdgeInsets.only(top: 8),
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child: Text(
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'Stack trace: ${snapshot.stackTrace}',
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maxLines: 1,
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overflow: TextOverflow.ellipsis,
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),
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),
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];
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} else {
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switch (snapshot.connectionState) {
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case ConnectionState.none:
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children = const <Widget>[
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Icon(
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Icons.info,
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color: Colors.blue,
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size: 60,
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),
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Padding(
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padding: EdgeInsets.only(top: 16),
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child: Text('Select a lot'),
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),
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];
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case ConnectionState.waiting:
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children = const <Widget>[
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SizedBox(
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width: 60,
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height: 60,
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child: CircularProgressIndicator(),
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),
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Padding(
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padding: EdgeInsets.only(top: 16),
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child: Text('Awaiting bids...'),
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),
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];
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case ConnectionState.active:
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children = <Widget>[
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const Icon(
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Icons.check_circle_outline,
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color: Colors.green,
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size: 60,
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),
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Padding(
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padding: const EdgeInsets.only(top: 16),
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child: Text('\$${snapshot.data}'),
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),
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];
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case ConnectionState.done:
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children = <Widget>[
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const Icon(
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Icons.info,
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color: Colors.blue,
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size: 60,
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),
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Padding(
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padding: const EdgeInsets.only(top: 16),
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child: Text(
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snapshot.hasData
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? '\$${snapshot.data} (closed)'
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: '(closed)',
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),
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),
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];
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}
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}
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return Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: children,
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);
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},
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);
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}
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}
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110
examples/api/test/widgets/async/stream_builder.0_test.dart
Normal file
110
examples/api/test/widgets/async/stream_builder.0_test.dart
Normal file
@ -0,0 +1,110 @@
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// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'package:flutter/material.dart';
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import 'package:flutter_api_samples/widgets/async/stream_builder.0.dart'
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as example;
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('StreamBuilder listens to internal stream', (WidgetTester tester) async {
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await tester.pumpWidget(
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const example.StreamBuilderExampleApp(),
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);
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expect(find.byType(CircularProgressIndicator), findsOneWidget);
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expect(find.text('Awaiting bids...'), findsOneWidget);
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await tester.pump(example.StreamBuilderExampleApp.delay);
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expect(find.byIcon(Icons.check_circle_outline), findsOneWidget);
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expect(find.text(r'$1'), findsOneWidget);
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await tester.pump(example.StreamBuilderExampleApp.delay);
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expect(find.byIcon(Icons.info), findsOneWidget);
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expect(find.text(r'$1 (closed)'), findsOneWidget);
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});
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testWidgets('BidsStatus correctly displays error state', (WidgetTester tester) async {
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final StreamController<int> controller = StreamController<int>();
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addTearDown(controller.close);
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controller.onListen = () {
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controller.addError('Unexpected error!', StackTrace.empty);
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};
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await tester.pumpWidget(
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MaterialApp(
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home: example.BidsStatus(bids: controller.stream),
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),
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);
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await tester.pump();
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expect(find.byIcon(Icons.error_outline), findsOneWidget);
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expect(find.text('Error: Unexpected error!'), findsOneWidget);
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expect(find.text('Stack trace: ${StackTrace.empty}'), findsOneWidget);
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});
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testWidgets('BidsStatus correctly displays none state', (WidgetTester tester) async {
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await tester.pumpWidget(
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const MaterialApp(
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home: example.BidsStatus(bids: null),
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),
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);
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expect(find.byIcon(Icons.info), findsOneWidget);
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expect(find.text('Select a lot'), findsOneWidget);
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});
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testWidgets('BidsStatus correctly displays waiting state', (WidgetTester tester) async {
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final StreamController<int> controller = StreamController<int>();
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addTearDown(controller.close);
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await tester.pumpWidget(
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MaterialApp(
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home: example.BidsStatus(bids: controller.stream),
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),
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);
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expect(find.byType(CircularProgressIndicator), findsOneWidget);
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expect(find.text('Awaiting bids...'), findsOneWidget);
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});
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testWidgets('BidsStatus correctly displays active state', (WidgetTester tester) async {
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final StreamController<int> controller = StreamController<int>();
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addTearDown(controller.close);
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controller.onListen = () {
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controller.add(1);
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};
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await tester.pumpWidget(
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MaterialApp(
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home: example.BidsStatus(bids: controller.stream),
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),
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);
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await tester.pump();
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expect(find.byIcon(Icons.check_circle_outline), findsOneWidget);
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expect(find.text(r'$1'), findsOneWidget);
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});
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testWidgets('BidsStatus correctly displays done state', (WidgetTester tester) async {
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final StreamController<int> controller = StreamController<int>();
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controller.close();
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await tester.pumpWidget(
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MaterialApp(
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home: example.BidsStatus(bids: controller.stream),
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),
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);
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await tester.pump();
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expect(find.byIcon(Icons.info), findsOneWidget);
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expect(find.text('(closed)'), findsOneWidget);
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});
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}
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