public async Task Should_Throw_If_View_Model_Null()
{
// Given
var navigationParameter = Substitute.For <INavigationParameter>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture();
// When
var result =
await Should
.ThrowAsync <ArgumentNullException>(async() => await sut.PushPage <NullViewModelMock>(navigationParameter))
.ConfigureAwait(false);
// Then
result.ParamName.ShouldBe("navigableViewModel");
}
public async Task Should_Call_Destroy()
{
// Given
var viewModel1 = Substitute.For <IEverything>();
var viewModel2 = Substitute.For <IEverything>();
var viewModel3 = Substitute.For <IEverything>();
var view = Substitute.For <IView>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture().WithView(view);
await sut.PushPage(viewModel1);
await sut.PushPage(viewModel2);
await sut.PushPage(viewModel3);
// When
await sut.PopToRootPage();
// Then
Received.InOrder(() =>
{
viewModel3.Destroy();
viewModel2.Destroy();
});
}
public async Task Should_Call_ViewModel_Factory()
{
// Given
var factory = Substitute.For <IViewModelFactory>();
factory.Create <NavigableViewModelMock>(Arg.Any <string?>()).Returns(new NavigableViewModelMock());
var navigationParameter = Substitute.For <INavigationParameter>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture().WithFactory(factory);
// When
await sut.PushPage <NavigableViewModelMock>(navigationParameter);
// Then
factory.Received().Create <NavigableViewModelMock>();
}
public async Task Should_Throw_If_Parameter_Null()
{
// Given
var viewModel = Substitute.For <INavigable>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture();
// When
var result =
await Should
.ThrowAsync <ArgumentNullException>(async() => await sut.PushPage(viewModel, (INavigationParameter)null))
.ConfigureAwait(false);
// Then
result.ParamName.ShouldBe("parameter");
}
public async Task Should_Call_In_Order()
{
// Given
var view = Substitute.For <IView>();
var viewModel = Substitute.For <INavigable>();
var navigationParameter = Substitute.For <INavigationParameter>();
ParameterViewStackService sut = new ParameterViewStackServiceFixture().WithView(view);
// When
await sut.PushPage(viewModel, navigationParameter);
// Then
Received.InOrder(() =>
{
viewModel.WhenNavigatingTo(Arg.Any <INavigationParameter>());
view.PushPage(Arg.Any <IViewModel>(), null, Arg.Any <bool>(), Arg.Any <bool>());
viewModel.WhenNavigatedTo(Arg.Any <INavigationParameter>());
});
}
