def test_largest_palindrome_product_of_two_one_digit_numbers_is_9(self):
     self.assertEqual(largest_palindrome(1), 9)
 def test_largest_palindrome_product_of_two_two_digit_numbers_is_9009(self):
     self.assertEqual(largest_palindrome(2), 9009)
 def test_project_euler_input(self):
     self.assertEqual(largest_palindrome(3), 906609)