added a test for conversion from number to fraction as well as corresponding functionality

src/main/py/fractions.py

@@ -3,6 +3,9 @@ from src.main.py.more_advanced_calculations import gcd, lcm
 def frac_to_dec(num, denom):
     return num/denom
 
+def dec_to_frac(dec_number):
+    return dec_number.as_integer_ratio()
+
 def reduceFraction(num, denom):
     gcdOfFraction = gcd(num, denom)
     num /= gcdOfFraction

src/test/py/test_fractions.py

@@ -15,6 +15,9 @@ class fractions(unittest.TestCase):
     def test_dec_value_of_negative_20_by_5_should_be_negative_4(self):
         self.assertEqual(frac_to_dec(-20,5), -4)
 
+    def test_dec_value_to_fraction_point_two_five_should_be_1_by_4(self):
+        self.assertEqual(dec_to_frac(0.25), (1,4))
+
     def test_reduce_fraction_56_by_32_should_be_7_by_4(self):
         self.assertEqual(reduceFraction(56,32), (7,4))