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expect(find.text('hi'), findsNothing);
});
<code_end>
<topic_end>
<topic_start>
complete example
<code_start>
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('Add and remove a todo', (tester) async {
// build the widget.
await tester.pumpWidget(const TodoList());
// enter 'hi' into the TextField.
await tester.enterText(find.byType(TextField), 'hi');
// tap the add button.
await tester.tap(find.byType(FloatingActionButton));
// rebuild the widget with the new item.
await tester.pump();
// expect to find the item on screen.
expect(find.text('hi'), findsOneWidget);
// swipe the item to dismiss it.
await tester.drag(find.byType(Dismissible), const offset(500, 0));
// build the widget until the dismiss animation ends.
await tester.pumpAndSettle();
// ensure that the item is no longer on screen.
expect(find.text('hi'), findsNothing);
});
}
class TodoList extends StatefulWidget {
const TodoList({super.key});
@override
State<TodoList> createState() => _TodoListState();
}
class _TodoListState extends State<TodoList> {
static const _appTitle = 'todo list';
final todos = <string>[];
final controller = TextEditingController();
@override
widget build(BuildContext context) {
return MaterialApp(
title: _appTitle,
home: scaffold(
appBar: AppBar(
title: const Text(_appTitle),
),
body: column(
children: [
TextField(
controller: controller,
),
expanded(
child: ListView.builder(
itemCount: todos.length,
itemBuilder: (context, index) {
final todo = todos[index];
return dismissible(
key: key('$todo$index'),
onDismissed: (direction) => todos.removeAt(index),
background: container(color: colors.red),
child: ListTile(title: text(todo)),
);
},
),
),
],
),
floatingActionButton: FloatingActionButton(
onPressed: () {
setState(() {
todos.add(controller.text);
controller.clear();
});
},
child: const Icon(Icons.add),
),
),
);
}
}
<code_end>
<topic_end>
<topic_start>
an introduction to integration testing
unit tests and widget tests are handy for testing individual classes,
functions, or widgets. however, they generally don’t test how
individual pieces work together as a whole, or capture the performance
of an application running on a real device. these tasks are performed
with integration tests.
integration tests are written using the integration_test package, provided
by the SDK.
in this recipe, learn how to test a counter app. it demonstrates
how to set up integration tests, how to verify specific text is displayed
by the app, how to tap specific widgets, and how to run integration tests.
this recipe uses the following steps:
<topic_end>
<topic_start>
1. create an app to test
first, create an app for testing. in this example,
test the counter app produced by the flutter create