public async Task Should_Have_One_Item_On_Stack()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
await sut.PushPage(new PageViewModelMock(), pages : 3);
await sut.PopToRootPage();
// When
var result = await sut.PageStack.FirstOrDefaultAsync();
// Then
result.ShouldHaveSingleItem();
}
public async Task Should_Return_Single_Notification()
{
// Given
int count = 0;
ViewStackService sut = new ViewStackServiceFixture();
await sut.PushPage(new PageViewModelMock(), pages : 3);
sut.View.PagePopped.Subscribe(_ =>
{
count++;
});
// When
await sut.PopToRootPage();
// Then
count.ShouldBe(1);
}
public async Task Should_Throw_If_Stack_Empty()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
// When
var result = await Should.ThrowAsync <InvalidOperationException>(async() => await sut.PopToRootPage()).ConfigureAwait(false);
// Then
result.Message.ShouldBe("Stack is empty.");
}
