added a test for division of two fractions and the corresponding functionality

src/main/py/fractions.py

@@ -25,3 +25,6 @@ def multiplyFractions(num1, denom1, num2, denom2):
     result_num = num1 * num2
     result_denom = denom1 * denom2
     return reduceFraction(result_num, result_denom)
+
+def divideFractions(num1, denom1, num2, denom2):
+    return multiplyFractions(num1, denom1, denom2, num2)

src/test/py/test_fractions.py

@@ -33,6 +33,9 @@ class fractions(unittest.TestCase):
     def test_multiply_fractions_1_by_5_and_5_by_3_should_be_1_by_3(self):
         self.assertEqual(multiplyFractions(1,5,5,3), (1,3))
 
+    def test_divide_fractions_10_by_3_and_20_by_9_should_be_3_by_2(self):
+        self.assertEqual(divideFractions(10,3,20,9), (3,2))
+
 
 if __name__ == '__main__':
     unittest.main()