public async Task Should_Call_In_Order()
{
// Given
var viewModel1 = Substitute.For <IEverything>();
var viewModel2 = Substitute.For <IEverything>();
var subject = new Subject <IViewModel>();
var navigationParameter = Substitute.For <INavigationParameter>();
var view = Substitute.For <IView>();
view.When(x => x.PopPage())
.Do(_ => subject.OnNext(viewModel2));
view
.PagePopped
.Returns(subject.AsObservable());
ParameterViewStackService sut = new ParameterViewStackServiceFixture().WithView(view);
await sut.PushPage(viewModel1);
await sut.PushPage(viewModel2);
// When
await sut.PopPage(navigationParameter);
// Then
Received.InOrder(() =>
{
view.PopPage(Arg.Any <bool>());
viewModel2.WhenNavigatedFrom(Arg.Any <INavigationParameter>());
viewModel2.Destroy();
});
}
public async Task Should_Throw_If_Parameter_Null()
{
// Given
ParameterViewStackService sut = new ParameterViewStackServiceFixture();
// When
var result =
await Record.ExceptionAsync(async() => await sut.PopPage(null))
.ConfigureAwait(false);
// Then
result.Should().BeOfType <ArgumentNullException>().Which.ParamName.Should().Be("parameter");
}
public async Task Should_Not_Call_When_Navigating_To()
{
// Given
var viewModel = Substitute.For <INavigable>();
var navigationParameter = Substitute.For <INavigationParameter>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture().WithPushed(viewModel);
// When
await sut.PopPage(navigationParameter);
// Then
await viewModel.DidNotReceive().WhenNavigatingTo(navigationParameter);
}
public async Task Should_Call_When_Navigated_From()
{
// Given
var viewModel = Substitute.For <INavigable>();
var navigationParameter = Substitute.For <INavigationParameter>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture().WithPushed(viewModel);
// When
await sut.PopPage(navigationParameter);
// Then
viewModel.Received().WhenNavigatedFrom(Arg.Any <INavigationParameter>());
}
public async Task Should_Call_View()
{
// Given
var viewModel = Substitute.For <INavigable>();
var navigationParameter = Substitute.For <INavigationParameter>();
var view = Substitute.For <IView>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture().WithView(view).WithPushed(viewModel);
// When
await sut.PopPage(navigationParameter);
// Then
await view.Received().PopPage(Arg.Any <bool>());
}
public async Task Should_Call_Destroy()
{
// Given
var viewModel = Substitute.For <IEverything>();
var navigationParameter = Substitute.For <INavigationParameter>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture().WithView(new NavigationViewMock());
await sut.PushPage(viewModel);
await sut.PushPage(viewModel);
// When
await sut.PopPage(navigationParameter);
// Then
viewModel.Received(1).Destroy();
}
public async Task Should_Call_When_Page_Popped()
{
// Given
var viewModel1 = Substitute.For <IDestructibleMock>();
var viewModel2 = Substitute.For <IDestructibleMock>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture().WithView(new NavigationViewMock());
// When
await sut.PushPage(viewModel1);
await sut.PushPage(viewModel2);
await sut.PopPage();
// Then
viewModel2.Received(1).Destroy();
}
public async Task Should_Not_Call_When_Navigated_To()
{
// Given
var firstViewModel = Substitute.For <INavigable>();
var secondViewModel = Substitute.For <INavigable>();
var navigationParameter = Substitute.For <INavigationParameter>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture().WithView(new NavigationViewMock());
// When
await sut.PushPage(firstViewModel);
await sut.PushPage(secondViewModel);
await sut.PopPage(navigationParameter);
// Then
await secondViewModel.DidNotReceive().WhenNavigatedTo(navigationParameter);
}