Add unit test for method show_limits

This patch adds unit test for limits_client.
Specific about method show_limits.

Change-Id: I03acbf807d388d5d6c61dafff0f2d9a07520775f
diff --git a/tempest/tests/services/compute/test_limits_client.py b/tempest/tests/services/compute/test_limits_client.py
new file mode 100644
index 0000000..4086210
--- /dev/null
+++ b/tempest/tests/services/compute/test_limits_client.py
@@ -0,0 +1,69 @@
+# Copyright 2015 NEC Corporation.  All rights reserved.
+#
+#    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.
+
+import httplib2
+
+from oslo_serialization import jsonutils as json
+from oslotest import mockpatch
+
+from tempest.services.compute.json import limits_client
+from tempest.tests import base
+from tempest.tests import fake_auth_provider
+
+
+class TestLimitsClient(base.TestCase):
+
+    def setUp(self):
+        super(TestLimitsClient, self).setUp()
+        fake_auth = fake_auth_provider.FakeAuthProvider()
+        self.client = limits_client.LimitsClient(
+            fake_auth, 'compute', 'regionOne')
+
+    def _test_show_limits(self, bytes_body=False):
+        expected = {"rate": [],
+                    "absolute": {"maxServerMeta": 128,
+                                 "maxPersonality": 5,
+                                 "totalServerGroupsUsed": 0,
+                                 "maxImageMeta": 128,
+                                 "maxPersonalitySize": 10240,
+                                 "maxServerGroups": 10,
+                                 "maxSecurityGroupRules": 20,
+                                 "maxTotalKeypairs": 100,
+                                 "totalCoresUsed": 0,
+                                 "totalRAMUsed": 0,
+                                 "totalInstancesUsed": 0,
+                                 "maxSecurityGroups": 10,
+                                 "totalFloatingIpsUsed": 0,
+                                 "maxTotalCores": 20,
+                                 "totalSecurityGroupsUsed": 0,
+                                 "maxTotalFloatingIps": 10,
+                                 "maxTotalInstances": 10,
+                                 "maxTotalRAMSize": 51200,
+                                 "maxServerGroupMembers": 10}}
+        serialized_body = json.dumps({"limits": expected})
+        if bytes_body:
+            serialized_body = serialized_body.encode('utf-8')
+
+        mocked_resp = (httplib2.Response({'status': 200}), serialized_body)
+        self.useFixture(mockpatch.Patch(
+            'tempest.common.service_client.ServiceClient.get',
+            return_value=mocked_resp))
+        resp = self.client.show_limits()
+        self.assertEqual(expected, resp)
+
+    def test_show_limits_with_str_body(self):
+        self._test_show_limits()
+
+    def test_show_limits_with_bytes_body(self):
+        self._test_show_limits(bytes_body=True)