added test for new function sqrt_power as well as corresponding functionality

src/main/py/calculations_with_roots.py

@@ -1,6 +1,9 @@
-from src.main.py.logarithmic_and_expo_and_root_calculations import sqrt
+from src.main.py.logarithmic_and_expo_and_root_calculations import *
 
 def multiplyRoots(first_number, second_number):
     if first_number < 0 or second_number < 0:
         return -1
     return sqrt(first_number * second_number)
+
+def sqrt_power(base, exponent):
+    return potentiate(sqrt(base), exponent)

src/test/py/test_calculations_with_roots.py

@@ -18,6 +18,9 @@ class calculationsWithRoots(unittest.TestCase):
     def test_sqrt_negative_2_times_sqrt_negative_8_should_be_negative_one_for_error(self):
         self.assertEqual(multiplyRoots(-2, -8), -1)
 
+    def test_sqrt_4_to_power_of_3_should_be_8(self):
+        self.assertEqual(sqrt_power(4, 3), 8)
+
 
 if __name__ == '__main__':
     unittest.main()