public void GetMessageUserIdInvalid()
        {
            var data = _fixture.CreateMany <Message>().ToList();
            var ids  = data.Select(x => x.UserId + 10);

            _mock.Setup(x => x.GetByUserId(It.IsIn(ids))).Returns(data);
            _mock.Setup(x => x.GetByUserId(It.IsNotIn(ids))).Returns((IEnumerable <Message>)null);

            MessageWorker.Initialize(_mock.Object);

            Assert.IsNull(MessageWorker.GetMessageByUser(-1));
            Assert.IsNull(MessageWorker.GetMessageByUser(0));
        }
 public IEnumerable <Message> GetByUser(int userId)
 {
     return(MessageWorker.GetMessageByUser(userId));
 }