public void GetErrors(Email entity)
        {
            base.GetErrors(entity);

            if (!EmailFunctions.IsValid(entity.Address))
            {
                entity.Errors.Add("Not a valid email address.");
            }
        }
        public void BeInvalid(string email)
        {
            var notValid = EmailFunctions.IsValid(email);

            Assert.False(notValid);
        }
        public void BeValid(string email)
        {
            var valid = EmailFunctions.IsValid(email);

            Assert.True(valid);
        }