added test to check if multiplication of two roots with both positive numbers returns the right number as well as corresponding functionality

src/main/py/calculations_with_roots.py

@@ -1,2 +1,4 @@
+import math
+
 def multiplyRoots(first_number, second_number):
-    return 0
+    return math.sqrt(first_number * second_number)

src/test/py/test_calculations_with_roots.py

@@ -12,6 +12,9 @@ class calculationsWithRoots(unittest.TestCase):
     def test_sqrt_0_times_sqrt_8_should_be_0(self):
         self.assertEqual(multiplyRoots(0, 8), 0)
 
+    def test_sqrt_2_times_sqrt_8_should_be_4(self):
+        self.assertEqual(multiplyRoots(2, 8), 4)
+
 
 if __name__ == '__main__':
     unittest.main()