Sum multiple terms

Write a function that receives multiple arguments and returns the sum of them. Example:

sum_multiple(2, 3, 5, 7) == 17
sum_multiple(2, 3) == 5

If no arguments are provided, an Exception should be raised. Check the test cases for the complete spec.

import unittest


class MultipleSumTestCase(unittest.TestCase):

    def test_sum_multiple_terms(self):
        self.assertEqual(sum_multiple(2, 3), 5)
        self.assertEqual(sum_multiple(2, 3, 5, 7), 17)

    def test_sum_with_no_elements_raises_error(self):
        with self.assertRaises(AttributeError):
            sum_multiple()