public async Task Should_Not_Pop()
{
// Given
ViewStackService sut = new ViewStackServiceFixture().WithView(Substitute.For <IView>());
await sut.PushPage(new PageViewModelMock());
// When
await sut.TopPage();
// Then
await sut.View.DidNotReceive().PopPage();
}
public async Task Should_Push_Page()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
// When
await sut.PushPage(new PageViewModelMock());
var result = await sut.TopPage();
// Then
result.ShouldNotBeNull();
result.ShouldBeOfType <PageViewModelMock>();
}
public async Task Should_Return_Last_Element()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
await sut.PushPage(new PageViewModelMock("1"));
await sut.PushPage(new PageViewModelMock("2"));
// When
var result = await sut.TopPage();
// Then
result.ShouldBeOfType <PageViewModelMock>();
result.Id.ShouldBe("2");
}
public async Task Should_Throw_If_Stack_Empty()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
// When
var result = await Should.ThrowAsync <InvalidOperationException>(async() => await sut.TopPage()).ConfigureAwait(false);
// Then
result.Message.ShouldBe("Sequence contains no elements");
}
