public void TestOnSubmitSuccess()
        {
            Mock <INavigationService> navigationMock = new Mock <INavigationService>(MockBehavior.Strict);

            navigationMock.Setup(a => a.NavigateToHomePage(It.IsAny <int>())).Returns(Task.CompletedTask);

            Mock <IUserController> userControllerMock = new Mock <IUserController>(MockBehavior.Strict);

            userControllerMock.Setup(a => a.UpdateUser(It.IsAny <User>(), It.IsAny <Stream>())).Returns(Task.FromResult(""));

            Mock <IConstantUserInstance> userInstanceMock = new Mock <IConstantUserInstance>(MockBehavior.Strict);

            userInstanceMock.Setup(a => a.GetUser()).Returns(new User()
            {
                Email = "*****@*****.**"
            });

            NewUserInfoViewModel viewModel = new NewUserInfoViewModel(navigationMock.Object, userControllerMock.Object,
                                                                      userInstanceMock.Object)
            {
                User = new User()
                {
                    FirstName = "Hunter",
                    LastName  = "Scanlan"
                }
            };

            viewModel.OnSubmit();

            userControllerMock.Verify(a => a.UpdateUser(It.IsAny <User>(), It.IsAny <Stream>()), Times.Once);
            navigationMock.Verify(a => a.NavigateToHomePage(It.IsAny <int>()), Times.Once);
        }
        public void TestOnSkip()
        {
            Mock <INavigationService> navigationMock = new Mock <INavigationService>(MockBehavior.Strict);

            navigationMock.Setup(a => a.NavigateToHomePage(It.IsAny <int>())).Returns(Task.CompletedTask);

            Mock <IUserController> userControllerMock = new Mock <IUserController>(MockBehavior.Strict);

            Mock <IConstantUserInstance> userInstanceMock = new Mock <IConstantUserInstance>(MockBehavior.Strict);

            userInstanceMock.Setup(a => a.GetUser()).Returns(new User()
            {
                Email = "*****@*****.**"
            });

            NewUserInfoViewModel viewModel = new NewUserInfoViewModel(navigationMock.Object, userControllerMock.Object,
                                                                      userInstanceMock.Object);

            viewModel.OnSkip();

            navigationMock.Verify(a => a.NavigateToHomePage(It.IsAny <int>()), Times.Once);
        }