Fix pungi-koji --version

Signed-off-by: dowang <dowang@redhat.com>

tests/test_arguments.py

@@ -0,0 +1,19 @@
+import mock
+import unittest
+import six
+import pungi
+
+from helpers import load_bin
+
+cli = load_bin("pungi-koji")
+
+
+class PungiKojiTestCase(unittest.TestCase):
+
+    @mock.patch('sys.argv', new=['prog', '--version'])
+    @mock.patch('sys.stderr', new_callable=six.StringIO)
+    @mock.patch('pungi_cli_fake_pungi-koji.get_full_version', return_value='a-b-c.111')
+    def test_version(self, get_full_version, stderr):
+        with self.assertRaises(SystemExit):
+            cli.main()
+        self.assertMultiLineEqual(stderr.getvalue(), 'a-b-c.111\n')