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I have been trying to test function that has a network call request with alamofire, using the dispatchqueue. I am having a problem making the function wait for the execution of the network request. The test simply runs asynchronously without waiting for the network call.Following is the code with which i tried func testLoginAg(){ let dispatchQueue = DispatchQueue(label: "QueueIdentification", qos: .background) dispatchQueue.async{ let username = "someemail@xyz.com" let password = "xxxxxxxxx" let headers = ["Content-Type": "application/json"] print("background") let params : [String : Any] = ["API_KEY" : "XXXX", "username" : username, "password":password] let url = MyVariables.baseUrl + "/api/login" self.sut.login(url: url, parameters: params, headers: headers) } DispatchQueue.global(qos: .userInteractive).async { XCTAssertNotEqual(sut.abc, true) for i in 11...20{ print(i) } } } Here the login function consists of the network request. The variable abc is set inside the login function after the network request call. Now how can i execute " XCTAssertNotEqual(sut.abc, true)" only after the completion of login function.