def METHOD_NAME(self):
    self.assertRaises(ZeroDivisionError, impedance_to_norm, 0, 0)
    self.assertEqual(impedance_to_norm(0), 0)
    self.assertEqual(impedance_to_norm(50), 1)
    self.assertEqual(impedance_to_norm(-50), -1)
    self.assertEqual(impedance_to_norm(75), 1.5)
    self.assertEqual(impedance_to_norm(75, 75), 1)
    self.assertEqual(impedance_to_norm(complex(0, 50)), complex(0, 1))
    self.assertEqual(impedance_to_norm(complex(50, 50)), complex(1, 1))
    self.assertEqual(impedance_to_norm(complex(0, -50)), complex(0, -1))
    self.assertAlmostEqual(impedance_to_norm(
        complex(100, 100), 30), (complex(3.333, 3.333)), 3)