public void GetContactById()
{
//Arrange
var mockUnitOfWork = new Mock <IUnitOfWork>();
//Esperamos que se llame al metodo Get del ContactRepository con un int
mockUnitOfWork.Setup(un => un.ContactRepository.GetByID(It.IsAny <int>()));
ContactValidator contactValidator = new ContactValidator(mockUnitOfWork.Object);
//Act
Contact returnedContact = contactValidator.GetContact("5");
//Assert
//mockUnitOfWork.VerifyAll();
}