public async Task DeleteAsync_NullTracker_DoesNothing()
{
// arrange
var service = new MockTrackerService();
service.Trackers.Add(null);
var vm = new TrackerViewModel(service);
// act
await vm.DeleteAsync(null);
// assert
Assert.Single(service.Trackers, expected: null);
}
public async Task DeleteAsync_ServiceCallFailure_SendsMessage()
{
// arrange
var vm = new TrackerViewModel(new FailingTrackerService());
var tracker = new Tracker();
bool messageSent = false;
MessagingCenter.Subscribe <TrackerViewModel>(this, nameof(vm.DeleteCommand),
sender => messageSent = true);
// act
await vm.DeleteAsync(tracker);
// assert
Assert.True(messageSent);
}
public async Task DeleteAsync_WithTracker_DeletesTracker()
{
// arrange
var tracker = new Tracker {
Id = 0
};
var service = new MockTrackerService();
service.Trackers.Add(tracker);
var vm = new TrackerViewModel(service);
// act
await vm.DeleteAsync(tracker);
// assert
Assert.Empty(vm.AllTrackers);
}