public void AddExternalUserAccount() { Guid userId = Guid.NewGuid(); var command = new AddUserAccountCommand { Name = "someUser", Type = "ActiveDirectory" }; var result = sut.AddUserAccount(userId, command) as OkResult; Assert.IsNotNull(result); identityManagementService.Received(1).AddExternalUserAccount(userId, AccountType.ActiveDirectory, command.Name); }