def test_1(self): self.assertEqual(gcd(0, 0), -1)
def test_5(self): self.assertEqual(gcd(233, 144), 1)
def test_6(self): self.assertEqual(gcd(23, 0), -1)
def test_3(self): self.assertEqual(gcd(122, 61), 61)
def test_4(self): self.assertEqual(gcd(222222222222200, 11111110000000000012), 4)
def test_1(self): self.assertEqual( gcd(0,0),-1)
def test_2(self): self.assertEqual(gcd(23, 46), 23)
def test_6(self): self.assertEqual(gcd(23,0),-1)
def test_5(self): self.assertEqual(gcd(233,144),1)
def test_4(self): self.assertEqual(gcd(222222222222200,11111110000000000012),4)
def test_3(self): self.assertEqual(gcd(122,61),61)
def test_2(self): self.assertEqual( gcd(23,46),23)