def test_is_odd(self):
"""Test that odd serial numbers are identified."""
s1 = SerialNumber(12)
s2 = SerialNumber(27)
self.assertFalse(s1.is_odd())
self.assertTrue(s2.is_odd())
def test_mod(self):
"""Test that the modulus is found correctly."""
s1 = SerialNumber(12)
s2 = SerialNumber(34)
self.assertEqual(s1.mod(s2), 12)
def test_test_bit(self):
"""Test that the truth value of a bit is found correctly."""
s = SerialNumber(12)
self.assertFalse(s.test_bit(0))
self.assertTrue(s.test_bit(2))
def test_gcd(self):
"""Test that the greatest common divisor is found correctly."""
s1 = SerialNumber(12)
s2 = SerialNumber(34)
self.assertEqual(s1.gcd(s2), 2)
