Write Tests for API Examples of `cupertino_text_field.0`, `data_table.0`,...

Write Tests for API Examples of `cupertino_text_field.0`, `data_table.0`, `icon_button.2` & `ink_well.0` (#139258)

Write Tests for API Examples of `cupertino_text_field.0`, `data_table.0`, `icon_button.2` & `ink_well.0`

Note: test for `cupertino_text_field.0` was already there but it was named `cupertino_text_field.0.dart`. I renamed it to `cupertino_text_field.0_test.dart`.

Part of #130459

dev/bots/check_code_samples.dart

@@ -309,7 +309,6 @@ class SampleChecker {
 // TODO(gspencergoog): implement the missing tests.
 // See https://github.com/flutter/flutter/issues/130459
 final Set<String> _knownMissingTests = <String>{
-  'examples/api/test/cupertino/text_field/cupertino_text_field.0_test.dart',
   'examples/api/test/material/bottom_app_bar/bottom_app_bar.2_test.dart',
   'examples/api/test/material/bottom_app_bar/bottom_app_bar.1_test.dart',
   'examples/api/test/material/theme/theme_extension.1_test.dart',
@@ -329,12 +328,10 @@ final Set<String> _knownMissingTests = <String>{
   'examples/api/test/material/menu_anchor/menu_anchor.2_test.dart',
   'examples/api/test/material/stepper/stepper.controls_builder.0_test.dart',
   'examples/api/test/material/flexible_space_bar/flexible_space_bar.0_test.dart',
-  'examples/api/test/material/data_table/data_table.0_test.dart',
   'examples/api/test/material/floating_action_button_location/standard_fab_location.0_test.dart',
   'examples/api/test/material/chip/deletable_chip_attributes.on_deleted.0_test.dart',
   'examples/api/test/material/snack_bar/snack_bar.2_test.dart',
   'examples/api/test/material/snack_bar/snack_bar.1_test.dart',
-  'examples/api/test/material/icon_button/icon_button.2_test.dart',
   'examples/api/test/material/icon_button/icon_button.3_test.dart',
   'examples/api/test/material/expansion_panel/expansion_panel_list.expansion_panel_list_radio.0_test.dart',
   'examples/api/test/material/input_decorator/input_decoration.1_test.dart',
@@ -378,7 +375,6 @@ final Set<String> _knownMissingTests = <String>{
   'examples/api/test/material/app_bar/sliver_app_bar.4_test.dart',
   'examples/api/test/material/app_bar/app_bar.3_test.dart',
   'examples/api/test/material/app_bar/app_bar.0_test.dart',
-  'examples/api/test/material/ink_well/ink_well.0_test.dart',
   'examples/api/test/material/banner/material_banner.1_test.dart',
   'examples/api/test/material/banner/material_banner.0_test.dart',
   'examples/api/test/material/checkbox/checkbox.1_test.dart',

examples/api/test/material/data_table/data_table.0_test.dart

+// 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/data_table/data_table.0.dart' as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('DataTable Smoke Test', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.DataTableExampleApp(),
+    );
+    expect(find.widgetWithText(AppBar, 'DataTable Sample'), findsOneWidget);
+    expect(find.byType(DataTable), findsOneWidget);
+    final DataTable dataTable = tester.widget<DataTable>(find.byType(DataTable));
+    expect(dataTable.columns.length, 3);
+    expect(dataTable.rows.length, 3);
+    for (int i = 0; i < dataTable.rows.length; i++) {
+      expect(dataTable.rows[i].cells.length, 3);
+    }
+    expect(find.text('Name'), findsOneWidget);
+    expect(find.text('Age'), findsOneWidget);
+    expect(find.text('Role'), findsOneWidget);
+    expect(find.text('Sarah'), findsOneWidget);
+    expect(find.text('19'), findsOneWidget);
+    expect(find.text('Student'), findsOneWidget);
+    expect(find.text('Janine'), findsOneWidget);
+    expect(find.text('43'), findsOneWidget);
+    expect(find.text('Professor'), findsOneWidget);
+    expect(find.text('William'), findsOneWidget);
+    expect(find.text('27'), findsOneWidget);
+    expect(find.text('Associate Professor'), findsOneWidget);
+  });
+}

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

+// 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/icon_button/icon_button.2.dart' as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('IconButton Types', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.IconButtonApp(),
+    );
+    expect(find.widgetWithIcon(IconButton, Icons.filter_drama), findsNWidgets(8));
+    final Finder iconButtons = find.widgetWithIcon(IconButton, Icons.filter_drama);
+    for (int i = 0; i <= 3; i++) {
+      expect(tester.widget<IconButton>(iconButtons.at(i)).onPressed is VoidCallback, isTrue);
+    }
+    for (int i = 4; i <= 7; i++) {
+      expect(tester.widget<IconButton>(iconButtons.at(i)).onPressed, isNull);
+    }
+  });
+}

examples/api/test/material/ink_well/ink_well.0_test.dart

+// 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/ink_well/ink_well.0.dart' as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Clicking on InkWell changes the Size of 50x50 AnimatedContainer to 100x100 and vice versa', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const example.InkWellExampleApp(),
+    );
+    expect(find.widgetWithText(AppBar, 'InkWell Sample'), findsOneWidget);
+    final Finder inkWell = find.byType(InkWell);
+    final InkWell inkWellWidget = tester.widget<InkWell>(inkWell);
+    final Finder animatedContainer = find.byType(AnimatedContainer);
+    AnimatedContainer animatedContainerWidget = tester.widget<AnimatedContainer>(animatedContainer);
+    expect(inkWell, findsOneWidget);
+    expect(inkWellWidget.onTap.runtimeType, VoidCallback);
+    expect(animatedContainerWidget.constraints?.minWidth, 50);
+    expect(animatedContainerWidget.constraints?.minHeight, 50);
+    await tester.tap(inkWell);
+    await tester.pumpAndSettle();
+    animatedContainerWidget = tester.widget<AnimatedContainer>(animatedContainer);
+    expect(animatedContainerWidget.constraints?.minWidth, 100);
+    expect(animatedContainerWidget.constraints?.minHeight, 100);
+    await tester.tap(inkWell);
+    await tester.pumpAndSettle();
+    animatedContainerWidget = tester.widget<AnimatedContainer>(animatedContainer);
+    expect(animatedContainerWidget.constraints?.minWidth, 50);
+    expect(animatedContainerWidget.constraints?.minHeight, 50);
+  });
+}