[shared_preferences] Prepare for change in handling of NoSuchMethod.

packages/shared_preferences/shared_preferences_platform_interface/lib/shared_preferences_platform_interface.dart

@@ -27,7 +27,7 @@ abstract class SharedPreferencesStorePlatform {
     if (!value.isMock) {
       try {
         value._verifyProvidesDefaultImplementations();
-      } on NoSuchMethodError catch (_) {
+      } catch (_) {
         throw AssertionError(
             'Platform interfaces must not be implemented with `implements`');
       }

packages/shared_preferences/shared_preferences_platform_interface/test/shared_preferences_platform_interface_test.dart

@@ -17,6 +17,16 @@ void main() {
         throwsAssertionError,
       );
     });
+
+    test('disallows implementing interface, unusual exception', () {
+      expect(
+        () {
+          SharedPreferencesStorePlatform.instance =
+              IllegalImplementationWithUnusualException();
+        },
+        throwsAssertionError,
+      );
+    });
   });
 }
 
@@ -46,3 +56,12 @@ class IllegalImplementation implements SharedPreferencesStorePlatform {
     throw UnimplementedError();
   }
 }
+
+class IllegalImplementationWithUnusualException extends IllegalImplementation {
+  @override
+  dynamic noSuchMethod(Invocation invocation) {
+    throw _UnusualException();
+  }
+}
+
+class _UnusualException {}