public void ShouldThrowExceptionWhenGetUserByUsernameFails()
{
_userRepository = new Mock<IUserRepository>();
_userRepository.Setup(a => a.Find(It.IsAny<Expression<Func<User, bool>>>(),
It.IsAny<Func<IQueryable<User>, IOrderedQueryable<User>>>(), It.IsAny<string>()))
.Throws(new Exception());
_addressRepository = new Mock<IAddressRepository>();
_educationRepository = new Mock<IEducationRepository>();
_mediaRepository = new Mock<IMediaRepository>();
_usersLogic = new UsersLogic(_userRepository.Object, _addressRepository.Object,
_educationRepository.Object, _mediaRepository.Object);
Assert.Throws<BlogException>(() => _usersLogic.GetByUserName("foo"));
}