Test that v3fedkerb plugin loads

Currently the v3fedkerb plugin loads the incorrect parameters. This was
never tested. This patch introduces a test and a future patch will fix
the code and modify the test.

Change-Id: Ia7fb7f1d7db0510df42798b9d668d58070234aff

keystoneauth1/tests/unit/extras/kerberos/test_fedkerb_loading.py

@@ -0,0 +1,33 @@
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from keystoneauth1 import loading
+from keystoneauth1.tests.unit import utils as test_utils
+
+
+class FedKerbLoadingTests(test_utils.TestCase):
+
+    def test_options(self):
+        opts = [o.name for o in
+                loading.get_plugin_loader('v3fedkerb').get_options()]
+
+        allowed_opts = ['domain-id',
+                        'domain-name',
+                        'project-id',
+                        'project-name',
+                        'project-domain-id',
+                        'project-domain-name',
+                        'trust-id',
+                        'auth-url',
+                        ]
+
+        self.assertItemsEqual(allowed_opts, opts)