public async Task Should_Throw_If_Stack_Empty()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
// When
var result = await Record.ExceptionAsync(async() => await sut.TopModal()).ConfigureAwait(false);
// Then
result.Should().BeOfType <ArgumentOutOfRangeException>().Which.ParamName.Should().Be("index");
}
public async Task Should_Not_Pop()
{
// Given
ViewStackService sut = new ViewStackServiceFixture().WithView(Substitute.For <IView>());
await sut.PushModal(new NavigableViewModelMock());
// When
await sut.TopModal();
// Then
await sut.View.DidNotReceive().PopModal();
}
public async Task Should_Push_Modal()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
await sut.PushModal(new NavigableViewModelMock());
// When
var result = await sut.TopModal();
// Then
result.Should().NotBeNull();
result.Should().BeOfType <NavigableViewModelMock>();
}
public async Task Should_Return_Last_Element()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
await sut.PushModal(new NavigableViewModelMock("1"));
await sut.PushModal(new NavigableViewModelMock("2"));
// When
var result = await sut.TopModal();
// Then
result.Should().BeOfType <NavigableViewModelMock>();
result.Id.Should().Be("2");
}
public async Task Should_Throw_If_Stack_Empty()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
// When
var result = await Should.ThrowAsync <InvalidOperationException>(async() => await sut.TopModal()).ConfigureAwait(false);
// Then
result.Message.ShouldBe("Sequence contains no elements");
}
