Prepare for fix to https://github.com/flutter/flutter/issues/109339.

packages/camera/camera_platform_interface/test/camera_platform_interface_test.dart

@@ -18,7 +18,14 @@ void main() {
     test('Cannot be implemented with `implements`', () {
       expect(() {
         CameraPlatform.instance = ImplementsCameraPlatform();
-      }, throwsNoSuchMethodError);
+        // In versions of `package:plugin_platform_interface` prior to fixing
+        // https://github.com/flutter/flutter/issues/109339, an attempt to
+        // implement a platform interface using `implements` would sometimes
+        // throw a `NoSuchMethodError` and other times throw an
+        // `AssertionError`.  After the issue is fixed, an `AssertionError` will
+        // always be thrown.  For the purpose of this test, we don't really care
+        // what exception is thrown, so just allow any exception.
+      }, throwsA(anything));
     });
 
     test('Can be extended', () {

packages/google_maps_flutter/google_maps_flutter_platform_interface/test/platform_interface/google_maps_flutter_platform_test.dart

@@ -27,7 +27,14 @@ void main() {
       expect(() {
         GoogleMapsFlutterPlatform.instance =
             ImplementsGoogleMapsFlutterPlatform();
-      }, throwsA(isInstanceOf<AssertionError>()));
+        // In versions of `package:plugin_platform_interface` prior to fixing
+        // https://github.com/flutter/flutter/issues/109339, an attempt to
+        // implement a platform interface using `implements` would sometimes
+        // throw a `NoSuchMethodError` and other times throw an
+        // `AssertionError`.  After the issue is fixed, an `AssertionError` will
+        // always be thrown.  For the purpose of this test, we don't really care
+        // what exception is thrown, so just allow any exception.
+      }, throwsA(anything));
     });
 
     test('Can be mocked with `implements`', () {

packages/google_sign_in/google_sign_in_platform_interface/test/google_sign_in_platform_interface_test.dart

@@ -18,7 +18,14 @@ void main() {
     test('Cannot be implemented with `implements`', () {
       expect(() {
         GoogleSignInPlatform.instance = ImplementsGoogleSignInPlatform();
-      }, throwsA(isA<Error>()));
+        // In versions of `package:plugin_platform_interface` prior to fixing
+        // https://github.com/flutter/flutter/issues/109339, an attempt to
+        // implement a platform interface using `implements` would sometimes
+        // throw a `NoSuchMethodError` and other times throw an
+        // `AssertionError`.  After the issue is fixed, an `AssertionError` will
+        // always be thrown.  For the purpose of this test, we don't really care
+        // what exception is thrown, so just allow any exception.
+      }, throwsA(anything));
     });
 
     test('Can be extended', () {

packages/in_app_purchase/in_app_purchase_platform_interface/test/in_app_purchase_platform_test.dart

@@ -14,7 +14,14 @@ void main() {
     test('Cannot be implemented with `implements`', () {
       expect(() {
         InAppPurchasePlatform.instance = ImplementsInAppPurchasePlatform();
-      }, throwsNoSuchMethodError);
+        // In versions of `package:plugin_platform_interface` prior to fixing
+        // https://github.com/flutter/flutter/issues/109339, an attempt to
+        // implement a platform interface using `implements` would sometimes
+        // throw a `NoSuchMethodError` and other times throw an
+        // `AssertionError`.  After the issue is fixed, an `AssertionError` will
+        // always be thrown.  For the purpose of this test, we don't really care
+        // what exception is thrown, so just allow any exception.
+      }, throwsA(anything));
     });
 
     test('Can be extended', () {
@@ -126,7 +133,7 @@ void main() {
       InAppPurchasePlatformAddition.instance = null;
     });
 
-    test('Cannot be implemented with `implements`', () {
+    test('Default instance is null', () {
       expect(InAppPurchasePlatformAddition.instance, isNull);
     });
 

packages/quick_actions/quick_actions_platform_interface/test/quick_actions_platform_interface_test.dart

@@ -21,7 +21,14 @@ void main() {
     test('Cannot be implemented with `implements`', () {
       expect(() {
         QuickActionsPlatform.instance = ImplementsQuickActionsPlatform();
-      }, throwsNoSuchMethodError);
+        // In versions of `package:plugin_platform_interface` prior to fixing
+        // https://github.com/flutter/flutter/issues/109339, an attempt to
+        // implement a platform interface using `implements` would sometimes
+        // throw a `NoSuchMethodError` and other times throw an
+        // `AssertionError`.  After the issue is fixed, an `AssertionError` will
+        // always be thrown.  For the purpose of this test, we don't really care
+        // what exception is thrown, so just allow any exception.
+      }, throwsA(anything));
     });
 
     test('Can be extended', () {

packages/url_launcher/url_launcher_platform_interface/test/method_channel_url_launcher_test.dart

@@ -24,7 +24,14 @@ void main() {
     test('Cannot be implemented with `implements`', () {
       expect(() {
         UrlLauncherPlatform.instance = ImplementsUrlLauncherPlatform();
-      }, throwsA(isInstanceOf<AssertionError>()));
+        // In versions of `package:plugin_platform_interface` prior to fixing
+        // https://github.com/flutter/flutter/issues/109339, an attempt to
+        // implement a platform interface using `implements` would sometimes
+        // throw a `NoSuchMethodError` and other times throw an
+        // `AssertionError`.  After the issue is fixed, an `AssertionError` will
+        // always be thrown.  For the purpose of this test, we don't really care
+        // what exception is thrown, so just allow any exception.
+      }, throwsA(anything));
     });
 
     test('Can be mocked with `implements`', () {

packages/webview_flutter/webview_flutter_platform_interface/test/src/v4/platform_navigation_delegate_test.dart

@@ -23,7 +23,14 @@ void main() {
 
     expect(() {
       PlatformNavigationDelegate(params);
-    }, throwsNoSuchMethodError);
+      // In versions of `package:plugin_platform_interface` prior to fixing
+      // https://github.com/flutter/flutter/issues/109339, an attempt to
+      // implement a platform interface using `implements` would sometimes throw
+      // a `NoSuchMethodError` and other times throw an `AssertionError`.  After
+      // the issue is fixed, an `AssertionError` will always be thrown.  For the
+      // purpose of this test, we don't really care what exception is thrown, so
+      // just allow any exception.
+    }, throwsA(anything));
   });
 
   test('Can be extended', () {

packages/webview_flutter/webview_flutter_platform_interface/test/src/v4/platform_webview_controller_test.dart

@@ -28,7 +28,14 @@ void main() {
     expect(() {
       PlatformWebViewController(
           const PlatformWebViewControllerCreationParams());
-    }, throwsNoSuchMethodError);
+      // In versions of `package:plugin_platform_interface` prior to fixing
+      // https://github.com/flutter/flutter/issues/109339, an attempt to
+      // implement a platform interface using `implements` would sometimes throw
+      // a `NoSuchMethodError` and other times throw an `AssertionError`.  After
+      // the issue is fixed, an `AssertionError` will always be thrown.  For the
+      // purpose of this test, we don't really care what exception is thrown, so
+      // just allow any exception.
+    }, throwsA(anything));
   });
 
   test('Can be extended', () {

packages/webview_flutter/webview_flutter_platform_interface/test/src/v4/platform_webview_widget_test.dart

@@ -27,7 +27,14 @@ void main() {
 
     expect(() {
       PlatformWebViewWidget(params);
-    }, throwsNoSuchMethodError);
+      // In versions of `package:plugin_platform_interface` prior to fixing
+      // https://github.com/flutter/flutter/issues/109339, an attempt to
+      // implement a platform interface using `implements` would sometimes throw
+      // a `NoSuchMethodError` and other times throw an `AssertionError`.  After
+      // the issue is fixed, an `AssertionError` will always be thrown.  For the
+      // purpose of this test, we don't really care what exception is thrown, so
+      // just allow any exception.
+    }, throwsA(anything));
   });
 
   test('Can be extended', () {

packages/webview_flutter/webview_flutter_platform_interface/test/src/v4/webview_platform_test.dart

@@ -22,7 +22,14 @@ void main() {
   test('Cannot be implemented with `implements`', () {
     expect(() {
       WebViewPlatform.instance = ImplementsWebViewPlatform();
-    }, throwsNoSuchMethodError);
+      // In versions of `package:plugin_platform_interface` prior to fixing
+      // https://github.com/flutter/flutter/issues/109339, an attempt to
+      // implement a platform interface using `implements` would sometimes throw
+      // a `NoSuchMethodError` and other times throw an `AssertionError`.  After
+      // the issue is fixed, an `AssertionError` will always be thrown.  For the
+      // purpose of this test, we don't really care what exception is thrown, so
+      // just allow any exception.
+    }, throwsA(anything));
   });
 
   test('Can be extended', () {