add test for exeption

Signed-off-by: Matthias Gatto <[email protected]>

tests/test_exeptions.py

@@ -0,0 +1,16 @@
+import unittest
+import sys
+sys.path.append("..")
+from osc_sdk_python import Gateway
+from requests import HTTPError
+
+class TestExept(unittest.TestCase):
+
+    def test_listing(self):
+        gw = Gateway()
+        # a is not a valide argument
+        with self.assertRaises(HTTPError):
+            gw.ReadVms(Filters="a")
+
+if __name__ == '__main__':
+    unittest.main()