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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>
2. Enter text in the text field
Now that you have a todo app, begin writing the test.
Start by entering text into the TextField.Accomplish this task by:
<code_start>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');
});<code_end>
info Note
This recipe builds upon previous widget testing recipes.
To learn the core concepts of widget testing,
see the following recipes:<topic_end>
<topic_start>
3. Ensure tapping a button adds the todo
After entering text into the TextField, ensure that tapping
the FloatingActionButton adds the item to the list.This involves three steps:
<code_start>testWidgets('Add and remove a todo', (tester) async {
// Enter text code...
// Tap the add button.
await tester.tap(find.byType(FloatingActionButton));
// Rebuild the widget after the state has changed.
await tester.pump();
// Expect to find the item on screen.
expect(find.text('hi'), findsOneWidget);
});<code_end>
<topic_end>
<topic_start>
4. Ensure swipe-to-dismiss removes the todo
Finally, ensure that performing a swipe-to-dismiss action on the todo
item removes it from the list. This involves three steps:
<code_start>testWidgets('Add and remove a todo', (tester) async {
// Enter text and add the item...
// 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);
});<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.