public async Task It_removes_all_stack_entries_when_it_clears()
{
var sut = new BlindStackNavigator();
// Add an item to the stack.
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM()));
// Clear the stack.
await sut.Clear(CancellationToken.None);
// Stack must be empty.
Assert.Empty(sut.State.Stack);
}
public async Task It_disposes_VMs_when_clearing()
{
var sut = new BlindStackNavigator();
// Add 2 items to the stack.
var vm0 = (TestVM)await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(0)));
var vm1 = (TestVM)await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(1)));
// Clear to remove all items.
await sut.Clear(CancellationToken.None);
// All entries must be disposed.
Assert.True(vm0.IsDisposed);
Assert.True(vm1.IsDisposed);
}
public async Task Interface_contract_changes_can_be_detected()
{
var ct = CancellationToken.None;
IStackNavigator navigator = new BlindStackNavigator();
// If the core contract changes, we get compilation errors here.
INavigableViewModel vmAfterNavigate = await navigator.Navigate(ct, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(), false, false));
INavigableViewModel vmAfterBack = await navigator.NavigateBack(ct);
await navigator.Clear(ct);
// Navigate twice so that RemoveEntries works.
await navigator.Navigate(ct, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(), false, false));
await navigator.Navigate(ct, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(), false, false));
await navigator.RemoveEntries(ct, new int[] { 0 }.AsEnumerable());
}
public async Task It_produces_failed_notifications_for_Clear()
{
var sut = new BlindStackNavigator();
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM(throwOnDispose: true)));
var events = new List <StackNavigatorEventArgs>();
sut.StateChanged += Sut_StateChanged;
void Sut_StateChanged(object sender, StackNavigatorEventArgs args)
{
events.Add(args);
}
await Assert.ThrowsAsync <InvalidOperationException>(async() => await sut.Clear(CancellationToken.None));
sut.StateChanged -= Sut_StateChanged;
// There must be 2 notifications: 1 Processing when the clear starts and 1 FailedToProcess when it ends.
Assert.Equal(2, events.Count);
Assert.Equal(NavigatorRequestState.Processing, events[0].CurrentState.LastRequestState);
Assert.Equal(NavigatorRequestState.FailedToProcess, events[1].CurrentState.LastRequestState);
}
public async Task It_produces_2_notifications_for_Clear()
{
var sut = new BlindStackNavigator();
await sut.Navigate(CancellationToken.None, StackNavigatorRequest.GetNavigateRequest(() => new TestVM()));
var events = new List <StackNavigatorEventArgs>();
sut.StateChanged += Sut_StateChanged;
void Sut_StateChanged(object sender, StackNavigatorEventArgs args)
{
events.Add(args);
}
await sut.Clear(CancellationToken.None);
sut.StateChanged -= Sut_StateChanged;
// There must be 2 notifications: 1 Processing when the clear starts and 1 Processed when it ends.
Assert.Equal(2, events.Count);
Assert.Equal(NavigatorRequestState.Processing, events[0].CurrentState.LastRequestState);
Assert.Equal(NavigatorRequestState.Processed, events[1].CurrentState.LastRequestState);
}