public async Task Should_Return_Last_Element()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
await sut.PushPage(new NavigableViewModelMock("1"));
await sut.PushPage(new NavigableViewModelMock("2"));
// When
var result = await sut.TopPage();
// Then
result.Should().BeOfType <NavigableViewModelMock>();
result.Id.Should().Be("2");
}
public async Task Should_Clear_Navigation_Stack_If_Reset()
{
// Given
ViewStackService sut = new ViewStackServiceFixture().WithView(Substitute.For <IView>());
// When
await sut.PushPage(new NavigableViewModelMock(), pages : 3);
await sut.PushPage(new NavigableViewModelMock(), resetStack : true);
var result = await sut.PageStack.FirstOrDefaultAsync();
// Then
result.Should().ContainSingle();
}
public async Task Should_Throw_If_View_Model_Null()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
// When
var result = await Record.ExceptionAsync(async() => await sut.PushPage(null)).ConfigureAwait(false);
// Then
result.Should().BeOfType <ArgumentNullException>().Which.ParamName.Should().Be("viewModel");
}
public async Task Should_Receive_Push_Page()
{
// Given
ViewStackService sut = new ViewStackServiceFixture().WithView(Substitute.For <IView>());
// When
await sut.PushPage(new NavigableViewModelMock());
// Then
await sut.View.Received().PushPage(Arg.Any <IViewModel>(), null, false);
}
public async Task Should_Not_Pop()
{
// Given
ViewStackService sut = new ViewStackServiceFixture().WithView(Substitute.For <IView>());
await sut.PushPage(new NavigableViewModelMock());
// When
await sut.TopPage();
// Then
await sut.View.DidNotReceive().PopPage();
}
public async Task Should_Return_Unit()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
await sut.PushPage(new NavigableViewModelMock());
// When
var result = await sut.PopPage();
// Then
result.Should().BeOfType <Unit>();
}
public async Task Should_Receive_Pop_Page()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
await sut.PushPage(new NavigableViewModelMock());
// When
await sut.PopPage();
// Then
await sut.View.Received().PopPage();
}
public async Task Should_Push_Page_On_Stack()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
// When
await sut.PushPage(new NavigableViewModelMock());
var result = await sut.PageStack.FirstAsync();
// Then
result.Should().NotBeEmpty();
result.Count.Should().Be(1);
}
public async Task Should_Push_Page()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
// When
await sut.PushPage(new NavigableViewModelMock());
var result = await sut.TopPage();
// Then
result.Should().NotBeNull();
result.Should().BeOfType <NavigableViewModelMock>();
}
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_Pop_Page()
{
// Given
ViewStackService sut = new ViewStackServiceFixture().WithView(new NavigationViewMock());
await sut.PushPage(new NavigableViewModelMock());
// When
await sut.PopPage();
var result = await sut.PageStack.FirstAsync();
// Then
result.Should().BeEmpty();
}
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);
}
public async Task Should_Throw_If_View_Model_Null()
{
// Given
ViewStackService sut = new ViewStackServiceFixture();
// When
var result = await Should.ThrowAsync <ArgumentNullException>(async() => await sut.PushPage(null)).ConfigureAwait(false);
// Then
result.ParamName.ShouldBe("page");
}
