add replace method on GetInstance

@@ -128,4 +128,12 @@ extension Inst on GetInterface {
   /// [Get.lazyPut()], is registered in memory.
   /// - [tag] optional, if you use a [tag] to register the Instance.
   bool isPrepared<S>({String? tag}) => GetInstance().isPrepared<S>(tag: tag);
+
+  /// Replace a parent instance of a class in dependency management
+  /// with a [child] instance
+  void replace<P, C extends P>(C child, {String? tag, bool permanent = false}) {
+    delete<P>();
+    // ignore: unnecessary_cast
+    put(child as P, tag: tag, permanent: permanent);
+  }
 }

 import 'package:flutter_test/flutter_test.dart';
 import 'package:get/get.dart';
+
 import 'util/matcher.dart' as m;
 
 class Mock {
@@ -155,6 +156,13 @@ void main() {
       expect(instance.initialized, true);
     });
   });
+
+  test('Get.replace test for replacing parent instance with child', () async {
+    Get.replace<DisposableController, Controller>(Controller());
+    final instance = Get.find<DisposableController>();
+    expect(instance is Controller, isTrue);
+    expect((instance as Controller).init, greaterThan(0));
+  });
 }
 
 class Controller extends DisposableController {