public void ShouldGetCommentsByUser()
{
var expected = _comments.Where(a => a.UserId == 1).ToList();
_commentsRepository = new Mock<ICommentRepository>();
_commentsRepository.Setup(a => a.Find(It.IsAny<Expression<Func<Comment, bool>>>(),
It.IsAny<Func<IQueryable<Comment>, IOrderedQueryable<Comment>>>(), It.IsAny<string>()))
.Returns(expected);
_userRepository = new Mock<IUserRepository>();
_commentsLogic = new CommentsLogic(_commentsRepository.Object, _userRepository.Object);
var results = _commentsLogic.GetByUser(1);
Assert.NotNull(results);
Assert.AreEqual(3, results.Count);
Assert.AreEqual(1, results[0].User.Id);
Assert.AreEqual(1, results[1].User.Id);
Assert.AreEqual(1, results[2].User.Id);
}