Add power two challenge

math_probability/power_two/test_is_power_of_two.py

@@ -0,0 +1,23 @@
+from nose.tools import assert_equal, assert_raises
+
+
+class TestSolution(object):
+
+    def test_is_power_of_two(self):
+        solution = Solution()
+        assert_raises(TypeError, solution.is_power_of_two, None)
+        assert_equal(solution.is_power_of_two(0), False)
+        assert_equal(solution.is_power_of_two(1), True)
+        assert_equal(solution.is_power_of_two(2), True)
+        assert_equal(solution.is_power_of_two(15), False)
+        assert_equal(solution.is_power_of_two(16), True)
+        print('Success: test_is_power_of_two')
+
+
+def main():
+    test = TestSolution()
+    test.test_is_power_of_two()
+
+
+if __name__ == '__main__':
+    main()