Stops injecting revoke_api into TestCase

Unit tests should not be using injection. The objects that are
required by a test should be explicitly constructed and used.

Change-Id: Ia9101c45da8ae6176f8c975ad63276eb231b60c1

keystone/tests/unit/core.py

@@ -296,7 +296,6 @@ def cleanup():
         return cleanup
 
 
-@dependency.requires('revoke_api')
 class TestCase(BaseTestCase):
 
     def config_files(self):

keystone/tests/unit/test_revoke.py

@@ -18,6 +18,7 @@
 from oslo_utils import timeutils
 from testtools import matchers
 
+from keystone.contrib import revoke
 from keystone.contrib.revoke import model
 from keystone import exception
 from keystone.tests import unit as tests
@@ -112,6 +113,11 @@ def _matches(event, token_values):
 
 
 class RevokeTests(object):
+
+    def setUp(self):
+        super(RevokeTests, self).setUp()
+        self.revoke_api = revoke.Manger()
+
     def test_list(self):
         self.revoke_api.revoke_by_user(user_id=1)
         self.assertEqual(1, len(self.revoke_api.get_events()))