test material text field example (#147864)

Adds simple tests to the last two [TextField](https://api.flutter.dev/flutter/material/TextField-class.html) examples as part of fixing #130459.

dev/bots/check_code_samples.dart

@@ -315,8 +315,6 @@ final Set<String> _knownMissingTests = <String>{
  'examples/api/test/material/material_state/material_state_outlined_border.0_test.dart',
  'examples/api/test/material/material_state/material_state_property.0_test.dart',
  'examples/api/test/material/selectable_region/selectable_region.0_test.dart',
- 'examples/api/test/material/text_field/text_field.2_test.dart',
- 'examples/api/test/material/text_field/text_field.1_test.dart',
  'examples/api/test/material/range_slider/range_slider.0_test.dart',
  'examples/api/test/material/selection_container/selection_container_disabled.0_test.dart',
  'examples/api/test/material/selection_container/selection_container.0_test.dart',

examples/api/test/material/text_field/text_field.1_test.dart

@@ -0,0 +1,29 @@
+// Copyright 2014 The Flutter 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/material.dart';
+import 'package:flutter_api_samples/material/text_field/text_field.1.dart' as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+ testWidgets('Dialog shows submitted TextField value', (WidgetTester tester) async {
+ // This example is also used to illustrate special character counting.
+ const String sampleText = 'Some sample text 👨‍👩‍👦';
+ await tester.pumpWidget(const example.TextFieldExampleApp());
+
+ expect(find.byType(TextField), findsOneWidget);
+ expect(find.byType(AlertDialog), findsNothing);
+ expect(find.text('Thanks!'), findsNothing);
+ expect(find.widgetWithText(TextButton, 'OK'), findsNothing);
+ expect(find.text('You typed "$sampleText", which has the length ${sampleText.length}.'), findsNothing);
+
+ await tester.enterText(find.byType(TextField), sampleText);
+ await tester.testTextInput.receiveAction(TextInputAction.done);
+ await tester.pumpAndSettle();
+ expect(find.byType(AlertDialog), findsOneWidget);
+ expect(find.text('Thanks!'), findsOneWidget);
+ expect(find.widgetWithText(TextButton, 'OK'), findsOneWidget);
+ expect(find.text('You typed "$sampleText", which has length ${sampleText.characters.length}.'), findsOneWidget);
+ });
+}

examples/api/test/material/text_field/text_field.2_test.dart

@@ -0,0 +1,44 @@
+// Copyright 2014 The Flutter 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/material.dart';
+import 'package:flutter_api_samples/material/text_field/text_field.2.dart' as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+ testWidgets('Creates styled text fields', (WidgetTester tester) async {
+ await tester.pumpWidget(const example.TextFieldExamplesApp());
+
+ expect(find.text('TextField Examples'), findsOneWidget);
+ expect(find.byType(TextField), findsNWidgets(2));
+ expect(find.byType(example.FilledTextFieldExample), findsOneWidget);
+ expect(find.byType(example.OutlinedTextFieldExample), findsOneWidget);
+
+ final TextField filled = tester.widget<TextField>(find.descendant(
+ of: find.byType(example.FilledTextFieldExample),
+ matching: find.byType(TextField),
+ ));
+ expect(filled.decoration!.prefixIcon, isA<Icon>()
+ .having((Icon icon) => icon.icon, 'icon', Icons.search));
+ expect(filled.decoration!.suffixIcon, isA<Icon>()
+ .having((Icon icon) => icon.icon, 'icon', Icons.clear));
+ expect(filled.decoration!.labelText, 'Filled');
+ expect(filled.decoration!.hintText, 'hint text');
+ expect(filled.decoration!.helperText, 'supporting text');
+ expect(filled.decoration!.filled, true);
+
+ final TextField outlined = tester.widget<TextField>(find.descendant(
+ of: find.byType(example.OutlinedTextFieldExample),
+ matching: find.byType(TextField),
+ ));
+ expect(outlined.decoration!.prefixIcon, isA<Icon>()
+ .having((Icon icon) => icon.icon, 'icon', Icons.search));
+ expect(outlined.decoration!.suffixIcon, isA<Icon>()
+ .having((Icon icon) => icon.icon, 'icon', Icons.clear));
+ expect(outlined.decoration!.labelText, 'Outlined');
+ expect(outlined.decoration!.hintText, 'hint text');
+ expect(outlined.decoration!.helperText, 'supporting text');
+ expect(outlined.decoration!.border, isA<OutlineInputBorder>());
+ });
+}