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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>
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.