diff --git a/testing-module.d.ts b/testing-module.d.ts
index 0b08dfe24534c605f58f2104255eb2a20c3fb566..8fad3ab267decccca2d4d9a8e208ace2cd811e92 100644
--- a/testing-module.d.ts
+++ b/testing-module.d.ts
@@ -13,6 +13,7 @@ export declare class TestingModule extends NestApplicationContext {
     protected readonly graphInspector: GraphInspector;
     constructor(container: NestContainer, graphInspector: GraphInspector, contextModule: Module, applicationConfig: ApplicationConfig, scope?: Type<any>[]);
     private isHttpServer;
+    useCustomApplicationConstructor(Ctor: Type<INestApplication>): void;
     createNestApplication<T extends INestApplication = INestApplication>(httpAdapter: HttpServer | AbstractHttpAdapter, options?: NestApplicationOptions): T;
     createNestApplication<T extends INestApplication = INestApplication>(options?: NestApplicationOptions): T;
     createNestMicroservice<T extends object>(options: NestMicroserviceOptions & T): INestMicroservice;
diff --git a/testing-module.js b/testing-module.js
index 17957b409b224bc43c7e40a1071cf08061366063..6bc4e8a694fdec02df91e512131ffd70259d8859 100644
--- a/testing-module.js
+++ b/testing-module.js
@@ -15,6 +15,9 @@ class TestingModule extends core_1.NestApplicationContext {
         this.applicationConfig = applicationConfig;
         this.graphInspector = graphInspector;
     }
+    useCustomApplicationConstructor(Ctor) {
+        this.applicationConstructor = Ctor;
+    }
     isHttpServer(serverOrOptions) {
         return !!(serverOrOptions && serverOrOptions.patch);
     }
@@ -24,7 +27,8 @@ class TestingModule extends core_1.NestApplicationContext {
             : [this.createHttpAdapter(), serverOrOptions];
         this.applyLogger(appOptions);
         this.container.setHttpAdapter(httpAdapter);
-        const instance = new core_1.NestApplication(this.container, httpAdapter, this.applicationConfig, this.graphInspector, appOptions);
+        const Ctor = this.applicationConstructor || core_1.NestApplication;
+        const instance = new Ctor(this.container, httpAdapter, this.applicationConfig, this.graphInspector, appOptions);
         return this.createAdapterProxy(instance, httpAdapter);
     }
     createNestMicroservice(options) {