def test_is_in_radius(self):
     '''
     Tests the is_in_radius method of the Calculator class.
     '''
     self.assertEqual(1, Calculator.is_in_radius(2, 4, 5, 3, 4))
     self.assertEqual(0, Calculator.is_in_radius(2, 4, 5, 3, 2))
     self.assertEqual(1, Calculator.is_in_radius(2, 2, 0, 1, 1))
     self.assertEqual(0, Calculator.is_in_radius(2, 2, 0, 1, 0))