Apply BindingBase.checkInstance to TestDefaultBinaryMessengerBinding (#116937)

Author: Hixie

packages/flutter/test/cupertino/adaptive_text_selection_toolbar_test.dart

@@ -13,7 +13,7 @@ void main() {
   final MockClipboard mockClipboard = MockClipboard();
 
   setUp(() async {
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
       SystemChannels.platform,
       mockClipboard.handleMethodCall,
     );
@@ -23,7 +23,7 @@ void main() {
   });
 
   tearDown(() {
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
       SystemChannels.platform,
       null,
     );

packages/flutter/test/cupertino/text_field_test.dart

@@ -159,7 +159,7 @@ class PathPointsMatcher extends Matcher {
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
   final MockClipboard mockClipboard = MockClipboard();
-  TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, mockClipboard.handleMethodCall);
+  TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, mockClipboard.handleMethodCall);
 
   // Returns the first RenderEditable.
   RenderEditable findRenderEditable(WidgetTester tester) {

packages/flutter/test/cupertino/text_selection_test.dart

@@ -82,7 +82,7 @@ void main() {
   }
 
   setUp(() async {
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
       SystemChannels.platform,
       mockClipboard.handleMethodCall,
     );
@@ -92,7 +92,7 @@ void main() {
   });
 
   tearDown(() {
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
       SystemChannels.platform,
       null,
     );

packages/flutter/test/foundation/service_extensions_test.dart

@@ -546,7 +546,7 @@ void main() {
     bool completed;
 
     completed = false;
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMessageHandler('flutter/assets', (ByteData? message) async {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMessageHandler('flutter/assets', (ByteData? message) async {
       expect(utf8.decode(message!.buffer.asUint8List()), 'test');
       completed = true;
       return ByteData(5); // 0x0000000000
@@ -573,7 +573,7 @@ void main() {
     });
     expect(data, isFalse);
     expect(completed, isTrue);
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMessageHandler('flutter/assets', null);
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMessageHandler('flutter/assets', null);
   });
 
   test('Service extensions - exit', () async {

packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart

@@ -16,7 +16,7 @@ void main() {
 
   setUp(() async {
     TestWidgetsFlutterBinding.ensureInitialized();
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
       SystemChannels.platform,
       mockClipboard.handleMethodCall,
     );

packages/flutter/test/material/feedback_test.dart

@@ -27,14 +27,14 @@ void main () {
 
     setUp(() {
       semanticEvents = <Map<String, Object>>[];
-      TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockDecodedMessageHandler<dynamic>(SystemChannels.accessibility, (dynamic message) async {
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockDecodedMessageHandler<dynamic>(SystemChannels.accessibility, (dynamic message) async {
         final Map<dynamic, dynamic> typedMessage = message as Map<dynamic, dynamic>;
         semanticEvents.add(typedMessage.cast<String, Object>());
       });
     });
 
     tearDown(() {
-      TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockDecodedMessageHandler<dynamic>(SystemChannels.accessibility, null);
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockDecodedMessageHandler<dynamic>(SystemChannels.accessibility, null);
     });
 
     testWidgets('forTap', (WidgetTester tester) async {

packages/flutter/test/material/feedback_tester.dart

@@ -11,7 +11,7 @@ import 'package:flutter_test/flutter_test.dart';
 /// cannot be used in combination with other classes that do the same.
 class FeedbackTester {
   FeedbackTester() {
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, _handler);
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, _handler);
   }
 
   /// Number of times haptic feedback was requested (vibration).
@@ -34,7 +34,7 @@ class FeedbackTester {
 
   /// Stops tracking.
   void dispose() {
-    assert(TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.checkMockMessageHandler(SystemChannels.platform.name, _handler));
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, null);
+    assert(TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.checkMockMessageHandler(SystemChannels.platform.name, _handler));
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, null);
   }
 }

packages/flutter/test/material/search_test.dart

@@ -17,12 +17,12 @@ void main() {
   setUp(() async {
     // Fill the clipboard so that the Paste option is available in the text
     // selection menu.
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, mockClipboard.handleMethodCall);
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, mockClipboard.handleMethodCall);
     await Clipboard.setData(const ClipboardData(text: 'Clipboard data'));
   });
 
   tearDown(() {
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, null);
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, null);
   });
 
   testWidgets('Changing query moves cursor to the end of query', (WidgetTester tester) async {

packages/flutter/test/material/text_field_test.dart

@@ -176,7 +176,7 @@ void main() {
 
   setUp(() async {
     debugResetSemanticsIdCounter();
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
       SystemChannels.platform,
       mockClipboard.handleMethodCall,
     );
@@ -186,7 +186,7 @@ void main() {
   });
 
   tearDown(() {
-    TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
       SystemChannels.platform,
       null,
     );

packages/flutter/test/material/text_form_field_test.dart

@@ -17,7 +17,7 @@ import '../widgets/editable_text_utils.dart';
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
   final MockClipboard mockClipboard = MockClipboard();
-  TestDefaultBinaryMessengerBinding.instance!.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, mockClipboard.handleMethodCall);
+  TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(SystemChannels.platform, mockClipboard.handleMethodCall);
 
   setUp(() async {
     // Fill the clipboard so that the Paste option is available in the text