diff --git a/nova/test.py b/nova/test.py
index ee8a34f6625e..e3ecb6563c3d 100644
--- a/nova/test.py
+++ b/nova/test.py
@@ -53,6 +53,7 @@ from oslotest import mock_fixture
 from sqlalchemy.dialects import sqlite
 import testtools
 
+from nova.api.openstack import wsgi_app
 from nova.compute import rpcapi as compute_rpcapi
 from nova import context
 from nova.db.sqlalchemy import api as sqlalchemy_api
@@ -284,6 +285,10 @@ class TestCase(base.BaseTestCase):
 
         self.useFixture(nova_fixtures.GenericPoisonFixture())
 
+        # make sure that the wsgi app is fully initialized for all testcase
+        # instead of only once initialized for test worker
+        wsgi_app.init_global_data.reset()
+
     def _setup_cells(self):
         """Setup a normal cellsv2 environment.