public async Task PopulateStatsAsync_OddLoggedDays_ComputesCorrectMedian()
{
// arrange
var tracker = new Tracker {
Id = 0
};
var service = new MockTrackerLogService();
service.LoggedDays.Add(new LoggedDay {
Date = new DateTime(2002, 1, 1)
});
service.LoggedDays.Add(new LoggedDay {
Date = new DateTime(2002, 1, 1)
});
service.LoggedDays.Add(new LoggedDay {
Date = new DateTime(2001, 1, 1)
});
service.LoggedDays.Add(new LoggedDay {
Date = new DateTime(2000, 1, 1)
});
service.LoggedDays.Add(new LoggedDay {
Date = new DateTime(2000, 1, 1)
});
var vm = new TrackerLogViewModel(tracker, service, new MockSettingsViewModel());
await vm.PopulateAllDayGroupsAsync();
// act
await vm.PopulateStatsAsync();
// assert
Assert.Equal(1, vm.LoggedDayStats.Median);
}
public async Task PopulateAllDayGroupsAsync_ServiceFailure_DoesNotChangeState()
{
// arrange
var tracker = new Tracker {
Id = 0
};
var group = new LoggedDayGroup {
Date = DateTime.Now.Date, Count = 2
};
var vm = new TrackerLogViewModel(tracker, new FailingTrackerLogService(), new MockSettingsViewModel());
vm.AllDayGroups.Add(group);
// act
await vm.PopulateAllDayGroupsAsync();
// assert
Assert.Single(vm.AllDayGroups, expected: group);
}
public async Task PopulateAllDayGroupsAsync_ServiceFailure_SendsMessage()
{
// arrange
var tracker = new Tracker {
Id = 0
};
var vm = new TrackerLogViewModel(tracker, new FailingTrackerLogService(), new MockSettingsViewModel());
bool messageSent = false;
MessagingCenter.Subscribe <TrackerLogViewModel>(this, TrackerLogViewModel.DatabaseErrorMessage,
sender => messageSent = true);
// act
await vm.PopulateAllDayGroupsAsync();
// assert
Assert.True(messageSent);
}