public async Task events_size() { _eventstore.Setup(x => x.Size <FakeEntity>(Moq.It.IsAny <string>(), Moq.It.IsAny <Id>(), Moq.It.IsAny <Id[]>())) .Returns(Task.FromResult(0L)); await _entity.GetSize(); _eventstore.Verify(x => x.Size <FakeEntity>(Moq.It.IsAny <string>(), Moq.It.IsAny <Id>(), Moq.It.IsAny <Id[]>()), Moq.Times.Once); }