added test to check for fraction to string conversion as well as corresponding functionality

src/main/py/fractions.py

@@ -31,3 +31,6 @@ def multiplyFractions(num1, denom1, num2, denom2):
 
 def divideFractions(num1, denom1, num2, denom2):
     return multiplyFractions(num1, denom1, denom2, num2)
+
+def fraction_to_string(num, denom):
+    return str(num) + " / " + str(denom)

src/test/py/test_fractions.py

@@ -39,6 +39,9 @@ class fractions(unittest.TestCase):
     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))
 
+    def test_fraction_2_by_5_to_string(self):
+        self.assertEqual(fraction_to_string(2,5), "2 / 5")
+
 
 if __name__ == '__main__':
     unittest.main()