// Copyright 2016 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/widgets.dart'; import 'package:flutter_test/flutter_test.dart'; void main() { group('findsOneWidget', () { testWidgets('finds exactly one widget', (WidgetTester tester) async { await tester.pumpWidget(new Text('foo')); expect(find.text('foo'), findsOneWidget); }); testWidgets('fails with a descriptive message', (WidgetTester tester) async { TestFailure failure; try { expect(find.text('foo'), findsOneWidget); } catch(e) { failure = e; } expect(failure, isNotNull); String message = failure.message; expect(message, contains('Expected: exactly one matching node in the widget tree\n')); expect(message, contains('Actual: ?:<zero widgets with text "foo">\n')); expect(message, contains('Which: means none were found but one was expected\n')); }); }); group('findsNothing', () { testWidgets('finds no widgets', (WidgetTester tester) async { expect(find.text('foo'), findsNothing); }); testWidgets('fails with a descriptive message', (WidgetTester tester) async { await tester.pumpWidget(new Text('foo')); TestFailure failure; try { expect(find.text('foo'), findsNothing); } catch(e) { failure = e; } expect(failure, isNotNull); String message = failure.message; expect(message, contains('Expected: no matching nodes in the widget tree\n')); expect(message, contains('Actual: ?:<exactly one widget with text "foo": Text("foo")>\n')); expect(message, contains('Which: means one was found but none were expected\n')); }); }); }