def test_sqrt_of_negative_number(self): self.assertIsNone(sqrt(-188))
def test_sqrt_of_0(self): self.assertEqual(0, sqrt(0))
def test_sqrt_of_70(self): self.assertEqual(8, sqrt(70))
def test_sqrt_of_81(self): self.assertEqual(9, sqrt(81))
def test_sqrt_of_40(self): self.assertEqual(6, sqrt(40))
def test_sqrt_of_27(self): self.assertEqual(5, sqrt(27))
def test_sqrt_of_1(self): self.assertEqual(1, sqrt(1))
def test_sqrt_of_16(self): self.assertEqual(4, sqrt(16))
def test_sqrt_of_9(self): self.assertEqual(3, sqrt(9))