def test_sum_of_divisors_prime(self):
     self.assertEqual(sum_of_divisors(23), 24)
def is_prime(n):
    if n == sum_of_divisors(n) - 1:
        return True
    else:
        return False
 def test_sum_of_divisors_one(self):
     self.assertEqual(sum_of_divisors(1), 1)
 def test_sum_of_divisors_negative(self):
     self.assertEqual(sum_of_divisors(-7), 0)
 def test_sum_of_divisors_zero(self):
     self.assertEqual(sum_of_divisors(0), 0)
 def test_sum_of_divisors_nonprime(self):
     self.assertEqual(sum_of_divisors(1000), 2340)
def is_prime(n):
    if n == sum_of_divisors(n) - 1:
        return True
    else:
        return False