refactoring: renamed test function to meet testing parameters

src/test/py/test_primitive_calculations.py

@@ -30,7 +30,7 @@ class primitive_calculations(unittest.TestCase):
     def test_multiply_5_multiply_5_equals_25(self):
         self.assertEqual(multiply(5, 5), 25)
 
-    def test_multiply_5_multiply_5_equals_5(self):
+    def test_multiply_minus_5_multiply_minus_5_equals_25(self):
         self.assertEqual(multiply(-5, -5), 25)