[Test]
        public void Login_OnCorrectUserAndPasswrod_ShouldSetTheLoggedInUser()
        {
            //Arrange
            var correctUser = "correct user";
            var correctPassword = "corect password";
            var cancelEventArgs = new CancelEventArgs();
            var employee = new EmployeeModel();
            employeeServiceMock.Setup(service =>
                service.Login(It.IsAny<string>(), It.IsAny<string>())).Returns(employee);

            //Act
            _viewModel.UserName = correctUser;
            _viewModel.Password = correctPassword;
            _viewModel.Login(cancelEventArgs);
            cancelEventArgs.Cancel.Should().BeFalse("Sikeresen bejelentkeztunk");
            loggedInEmployeeServiceMock.Object.LoggedInEmployee.Should().NotBeNull("a login kitolti");
            //Ellenorzi, hogy a login metodus meg lett-e hivva pontosan egy
            employeeServiceMock.Verify(service =>
                service.Login(It.IsAny<string>(), It.IsAny<string>()), Times.Once);
        }

        [Test]
        public void Login_OnWrongUserNameAndPassword_ShouldShowErrorAndCancel()
        {
            //Arrange
            var wrongUser = "user";
            var wrongPassword = "password";
            var cancelEventArgs = new CancelEventArgs();
            //Act
            _viewModel.UserName = wrongUser;
            _viewModel.Password = wrongPassword;
            _viewModel.Login(cancelEventArgs);

            //Assert
            cancelEventArgs.Cancel.Should().BeTrue("Hibas felhasznalonal nem lepunk be");
            messageServiceMock.Verify(service => service.ShowErrorMessage(It.IsAny<string>()), Times.Once());
        }