public void AddClient_CompleteRequest_Correct()
        {
            RegistrationRequest request = new RegistrationRequest
            {
                FirstName = "Myname",
                LastName  = "Yourname",
                Email     = "Email",
                Phone     = "+48000000000",
                Login     = "******",
                Password  = "******"
            };
            var controller = new AdvertController(new SqlServerDbService(new s19205Context(), new ConfigurationBuilder().Build()));
            var result     = controller.AddClient(request);

            Assert.IsNotNull(result);
            Assert.IsTrue(result is CreatedResult);
        }