Add tests to verify behavior on '' in self link

placement is adding a self link of '' to satisfy version discovery. Put
in a test to verify that we work properly with this. While we're in
there, add a quick test to show microversion discovery too.

Change-Id: I28e1b0ce6d372fc1e5aef335597b6db6e3b49660

openstack/tests/unit/base.py

@@ -468,6 +468,12 @@ class TestCase(base.TestCase):
             uri=compute_discovery_url,
             text=open(discovery_fixture, 'r').read())
 
+    def get_placement_discovery_mock_dict(self):
+        discovery_fixture = os.path.join(
+            self.fixtures_directory, "placement.json")
+        return dict(method='GET', uri="https://placement.example.com/",
+                    text=open(discovery_fixture, 'r').read())
+
     def get_designate_discovery_mock_dict(self):
         discovery_fixture = os.path.join(
             self.fixtures_directory, "dns.json")
@@ -500,6 +506,10 @@ class TestCase(base.TestCase):
             self.get_glance_discovery_mock_dict(
                 image_version_json, image_discovery_url)])
 
+    def use_placement(self):
+        self.__do_register_uris([
+            self.get_placement_discovery_mock_dict()])
+
     def use_designate(self):
         # NOTE(slaweq): This method is only meant to be used in "setUp"
         # where the ordering of the url being registered is tightly controlled

openstack/tests/unit/fixtures/catalog-v2.json

@@ -113,6 +113,20 @@
         "type": "object-store",
         "name": "swift"
       },
+      {
+        "endpoints_links": [],
+        "endpoints": [
+          {
+            "adminURL": "https://placement.example.com",
+            "region": "RegionOne",
+            "publicURL": "https://placement.example.com",
+            "internalURL": "https://placement.example.com",
+            "id": "652f0612744042bfbb8a8bb2c777a16e"
+          }
+        ],
+        "type": "placement",
+        "name": "placement"
+      },
       {
         "endpoints_links": [],
         "endpoints": [

openstack/tests/unit/fixtures/catalog-v3.json

@@ -136,6 +136,19 @@
         "name": "heat",
         "type": "orchestration"
       },
+      {
+        "endpoints": [
+          {
+            "id": "10c76ffd2b744a67950ed1365190d353",
+            "interface": "public",
+            "region": "RegionOne",
+            "url": "https://placement.example.com"
+          }
+        ],
+        "endpoints_links": [],
+        "name": "placement",
+        "type": "placement"
+      },
       {
         "endpoints": [
           {

openstack/tests/unit/fixtures/placement.json

@@ -0,0 +1,11 @@
+{
+    "versions": [
+        {
+            "id": "v1.0",
+            "links": [{"href": "", "rel": "self"}],
+            "max_version": "1.17",
+            "min_version": "1.0",
+            "status": "CURRENT"
+        }
+    ]
+}

openstack/tests/unit/test_placement_rest.py

@@ -0,0 +1,42 @@
+# Copyright (c) 2018 Red Hat, Inc.
+
+# 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 openstack.tests.unit import base
+
+
+class TestPlacementRest(base.TestCase):
+
+    def setUp(self):
+        super(TestPlacementRest, self).setUp()
+        self.use_placement()
+
+    def test_discovery(self):
+        self.register_uris([
+            dict(method='GET',
+                 uri=self.get_mock_url(
+                     'placement', 'public', append=['allocation_candidates']),
+                 json={})
+        ])
+        rs = self.cloud.placement.get('/allocation_candidates')
+        self.assertEqual(200, rs.status_code)
+        self.assertEqual(
+            'https://placement.example.com/allocation_candidates',
+            rs.url)
+        self.assert_calls()
+
+    def test_microversion_discovery(self):
+        self.assertEqual(
+            (1, 17),
+            self.cloud.placement.get_endpoint_data().max_microversion)
+        self.assert_calls()