Check 'auth_url' is presented while authentication

If 'auth_url' is missed in HTTPClient, authenticate method failed with
non-friendly error while trying to parse it.

Change-Id: Iaec95527293f3e1a34eb7f9ffa81097ba48107b3

novaclient/client.py

@@ -586,6 +586,10 @@ class HTTPClient(object):
                                              extract_token=False)
 
     def authenticate(self):
+        if not self.auth_url:
+            msg = _("Authentication requires 'auth_url', which should be "
+                    "specified in '%s'") % self.__class__.__name__
+            raise exceptions.AuthorizationFailure(msg)
         magic_tuple = netutils.urlsplit(self.auth_url)
         scheme, netloc, path, query, frag = magic_tuple
         port = magic_tuple.port

novaclient/tests/unit/test_http.py

@@ -141,6 +141,11 @@ class ClientTest(utils.TestCase):
 
         test_auth_call()
 
+    def test_auth_failure_due_to_miss_of_auth_url(self):
+        cl = client.HTTPClient("username", "password")
+
+        self.assertRaises(exceptions.AuthorizationFailure, cl.authenticate)
+
     def test_connection_refused(self):
         cl = get_client()