Adds test to cover Swift healthcheck middleware

Simple middleware, simple test. One test is run:
A single GET is sent to "/healthcheck", a HTTP 200 response is
expected.

Change-Id: If6428259c5094c0b56b57ab0064d017d4c4340f7
diff --git a/tempest/api/object_storage/test_healthcheck.py b/tempest/api/object_storage/test_healthcheck.py
new file mode 100644
index 0000000..798ea4f
--- /dev/null
+++ b/tempest/api/object_storage/test_healthcheck.py
@@ -0,0 +1,65 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright (C) 2013 eNovance SAS <licensing@enovance.com>
+#
+# Author: Joe H. Rahme <joe.hakim.rahme@enovance.com>
+#
+# 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 tempest.api.object_storage import base
+from tempest import clients
+from tempest.test import attr
+from tempest.test import HTTP_SUCCESS
+
+
+class HealthcheckTest(base.BaseObjectTest):
+
+    @classmethod
+    def setUpClass(cls):
+        super(HealthcheckTest, cls).setUpClass()
+
+        # creates a test user. The test user will set its base_url to the Swift
+        # endpoint and test the healthcheck feature.
+        cls.data.setup_test_user()
+
+        cls.os_test_user = clients.Manager(
+            cls.data.test_user,
+            cls.data.test_password,
+            cls.data.test_tenant)
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.data.teardown_all()
+        super(HealthcheckTest, cls).tearDownClass()
+
+    def setUp(self):
+        super(HealthcheckTest, self).setUp()
+        client = self.os_test_user.account_client
+        client._set_auth()
+
+        # Turning http://.../v1/foobar into http://.../
+        client.base_url = "/".join(client.base_url.split("/")[:-2])
+
+    def tearDown(self):
+        # clear the base_url for subsequent requests
+        self.os_test_user.account_client.base_url = None
+        super(HealthcheckTest, self).tearDown()
+
+    @attr('gate')
+    def test_get_healthcheck(self):
+
+        resp, _ = self.os_test_user.account_client.get("healthcheck", {})
+
+        # The status is expected to be 200
+        self.assertIn(int(resp['status']), HTTP_SUCCESS)