Add bits to flip challenge

bit_manipulation/bits_to_flip/test_bits_to_flip.py

@@ -0,0 +1,21 @@
+from nose.tools import assert_equal
+
+
+class TestBits(object):
+
+    def test_bits_to_flip(self):
+        bits = Bits()
+        a = int('11101', base=2)
+        b = int('01111', base=2)
+        expected = 2
+        assert_equal(bits.bits_to_flip(a, b), expected)
+        print('Success: test_bits_to_flip')
+
+
+def main():
+    test = TestBits()
+    test.test_bits_to_flip()
+
+
+if __name__ == '__main__':
+    main()