+
+ def test_version_argument(self):
+ err = io.BytesIO()
+ out = io.BytesIO()
+ with tutil.redirected_streams(stdout=out, stderr=err):
+ with self.assertRaises(SystemExit):
+ self.run_ws(['--version'])
+ self.assertEqual(out.getvalue(), '')
+ self.assertRegexpMatches(err.getvalue(), "[0-9]+\.[0-9]+\.[0-9]+")