diff --git a/flake8/tests/test_util.py b/flake8/tests/test_util.py
new file mode 100644
index 0000000..879056e
--- /dev/null
+++ b/flake8/tests/test_util.py
@@ -0,0 +1,77 @@
+import unittest
+try:
+    from unittest import mock
+except ImportError:
+    import mock  # < PY33
+
+from flake8.util import option_normalizer
+
+class TestOptionSerializer(unittest.TestCase):
+
+    def test_true(self):
+        option = option_normalizer('1')
+        self.assertEqual(option, True)
+
+        option = option_normalizer('T')
+        self.assertEqual(option, True)
+
+        option = option_normalizer('TRUE')
+        self.assertEqual(option, True)
+
+        option = option_normalizer('ON')
+        self.assertEqual(option, True)
+
+        option = option_normalizer('t')
+        self.assertEqual(option, True)
+
+        option = option_normalizer('true')
+        self.assertEqual(option, True)
+
+        option = option_normalizer('on')
+        self.assertEqual(option, True)
+
+    def test_false(self):
+        option = option_normalizer('0')
+        self.assertEqual(option, False)
+
+        option = option_normalizer('F')
+        self.assertEqual(option, False)
+
+        option = option_normalizer('FALSE')
+        self.assertEqual(option, False)
+
+        option = option_normalizer('OFF')
+        self.assertEqual(option, False)
+
+        option = option_normalizer('f')
+        self.assertEqual(option, False)
+
+        option = option_normalizer('false')
+        self.assertEqual(option, False)
+
+        option = option_normalizer('off')
+        self.assertEqual(option, False)
+
+    def test_multiple_option(self):
+        answer = ['F401', 'F402', 'F403', 'F404']
+
+        option = option_normalizer('F401,F402,F403,F404')
+        self.assertEqual(option, answer)
+
+        option = option_normalizer('F401 ,F402 ,F403 ,F404')
+        self.assertEqual(option, answer)
+
+        option = option_normalizer('F401, F402, F403, F404')
+        self.assertEqual(option, answer)
+
+        option = option_normalizer('''\
+            F401,
+            F402,
+            F403,
+            F404,
+        ''')
+        self.assertEqual(option, answer)
+
+
+if __name__ == '__main__':
+    unittest.main()