public void TimeRangeModelRepositoryDeleteAllShouldDeleteAllItems()
{
var item1 = new Statistic(new AllTimeSlice(DateTime.MinValue, DateTime.MaxValue));
var item2 = new Statistic(new AllTimeSlice(DateTime.Parse("2018-01-01 00:00:00"), DateTime.Parse("2018-03-31 00:00:00")));
var repository = new TimeSliceModelRepository <IStatistic>();
repository.Add(item1);
repository.Add(item2);
repository.DeleteAll();
repository.GetAll().Should().HaveCount(0);
}
