public async Task PopulateAllTrackersAsync_ServiceCallFailure_DoesNotClearAllTrackers()
{
// arrange
var vm = new TrackerViewModel(new FailingTrackerService());
var tracker = new Tracker {
Id = 0, Name = "Collen"
};
vm.AllTrackers.Add(tracker);
// act
await vm.PopulateAllTrackersAsync();
// assert
Assert.Single(vm.AllTrackers, tracker);
}
public async Task PopulateAllTrackersAsync_ServiceCallFailure_SendsMessage()
{
// arrange
var vm = new TrackerViewModel(new FailingTrackerService());
bool messageSent = false;
MessagingCenter.Subscribe <TrackerViewModel>(this, TrackerViewModel.AllTrackersPullFailedMessage,
sender => messageSent = true);
// act
await vm.PopulateAllTrackersAsync();
// assert
Assert.True(messageSent);
}