Patch default credentials when executing command unit tests.

Change-Id: I9cc69082ee3da64be83f53c5be12f656af606951

tobiko/tests/cmd/test_base.py

@@ -18,6 +18,7 @@ import os.path
 
 from tobiko.cmd import base
 from tobiko.tests.unit import TobikoUnitTest
+from tobiko.openstack import keystone
 
 
 class TobikoCMDTest(TobikoUnitTest):
@@ -25,6 +26,20 @@ class TobikoCMDTest(TobikoUnitTest):
     command_name = None
     command_class = base.TobikoCMD
 
+    default_credentials = keystone.keystone_credentials(
+        api_version=3,
+        auth_url='http://127.0.0.1:5000/identiy/v3',
+        username='demo',
+        project_name='demo',
+        password='this is a secret',
+        user_domain_name='Default',
+        project_domain_name='Default')
+
+    def setUp(self):
+        TobikoUnitTest.setUp(self)
+        self.patch('tobiko.openstack.keystone.default_keystone_credentials',
+                   return_value=self.default_credentials)
+
     def test_init(self, argv=None):
         self.patch_argv(argv=argv)
         cmd = self.command_class()