Added unit tests for CORS middleware

A simple set of sanity tests that assert that the CORS middleware
is correctly triggered.

Change-Id: I4c40d748caf404a152bcd2b60a6b9a4dbe2cff9b

ironic/tests/unit/api/test_middleware.py

@@ -0,0 +1,91 @@
+# -*- encoding: utf-8 -*-
+#
+#    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.
+"""
+Tests to assert that various incorporated middleware works as expected.
+"""
+
+from oslo_config import cfg
+import oslo_middleware.cors as cors_middleware
+
+from ironic.tests.unit.api import base
+
+
+class TestCORSMiddleware(base.BaseApiTest):
+    '''Provide a basic smoke test to ensure CORS middleware is active.
+
+    The tests below provide minimal confirmation that the CORS middleware
+    is active, and may be configured. For comprehensive tests, please consult
+    the test suite in oslo_middleware.
+    '''
+    def setUp(self):
+        # Make sure the CORS options are registered
+        cfg.CONF.register_opts(cors_middleware.CORS_OPTS, 'cors')
+
+        # Load up our valid domain values before the application is created.
+        cfg.CONF.set_override("allowed_origin",
+                              "http://valid.example.com",
+                              group='cors')
+
+        # Create the application.
+        super(TestCORSMiddleware, self).setUp()
+
+    def test_valid_cors_options_request(self):
+        response = self.app \
+            .options('/',
+                     headers={
+                         'Origin': 'http://valid.example.com',
+                         'Access-Control-Request-Method': 'GET'
+                     })
+
+        # Assert response status.
+        self.assertEqual(response.status, '200 OK')
+        self.assertIn('Access-Control-Allow-Origin', response.headers)
+        self.assertEqual('http://valid.example.com',
+                         response.headers['Access-Control-Allow-Origin'])
+
+    def test_invalid_cors_options_request(self):
+        response = self.app \
+            .options('/',
+                     headers={
+                         'Origin': 'http://invalid.example.com',
+                         'Access-Control-Request-Method': 'GET'
+                     })
+
+        # Assert response status.
+        self.assertEqual(response.status, '200 OK')
+        self.assertNotIn('Access-Control-Allow-Origin', response.headers)
+
+    def test_valid_cors_get_request(self):
+        response = self.app \
+            .get('/',
+                 headers={
+                     'Origin': 'http://valid.example.com'
+                 })
+
+        # Assert response status.
+        self.assertEqual(response.status, '200 OK')
+        self.assertIn('Access-Control-Allow-Origin', response.headers)
+        self.assertEqual('http://valid.example.com',
+                         response.headers['Access-Control-Allow-Origin'])
+
+    def test_invalid_cors_get_request(self):
+        response = self.app \
+            .get('/',
+                 headers={
+                     'Origin': 'http://invalid.example.com'
+                 })
+
+        # Assert response status.
+        self.assertEqual(response.status, '200 OK')
+        self.assertNotIn('Access-Control-Allow-Origin', response.headers)