Use the new method

Author: Feiyang1

packages/app-types/private.d.ts

@@ -83,7 +83,8 @@ export interface FirebaseAppInternals {
 
 export interface _FirebaseApp extends FirebaseApp {
   container: ComponentContainer;
-  _addComponent(component: Component, overwrite?: boolean): void;
+  _addComponent(component: Component): void;
+  _addOrOverwriteComponent(component: Component): void;
   _removeServiceInstance(name: string, instanceIdentifier?: string): void;
 }
 export interface _FirebaseNamespace extends FirebaseNamespace {

packages/testing/src/api/index.ts

@@ -141,9 +141,8 @@ function initializeApp(
       ComponentType.PRIVATE
     );
 
-    ((app as unknown) as _FirebaseApp)._addComponent(
-      mockAuthComponent,
-      /* overwrite */ true
+    ((app as unknown) as _FirebaseApp)._addOrOverwriteComponent(
+      mockAuthComponent
     );
   }
   if (databaseName) {