public async Task Should_Throw_If_Stack_Empty()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
// When
var result = await Record.ExceptionAsync(async() => await sut.PopToRootPage()).ConfigureAwait(false);
// Then
result.Should().BeOfType <InvalidOperationException>().Which.Message.Should().Be("Stack is empty.");
}
public async Task Should_Have_One_Item_On_Stack()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
await sut.PushPage(new NavigableViewModelMock(), pages : 3);
await sut.PopToRootPage();
// When
var result = await sut.PageStack.FirstOrDefaultAsync();
// Then
result.Should().ContainSingle();
}
public async Task Should_Clear_Navigation_Stack()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
await sut.PushPage(new NavigableViewModelMock(), pages : 3);
// When
await sut.PopToRootPage();
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 NavigableViewModelMock(), pages : 3);
sut.View.PagePopped.Subscribe(_ => count++);
// When
await sut.PopToRootPage();
// Then
count.Should().Be(1);
}
