diff --git a/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_ctypes.p.gz b/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_ctypes.p.gz
new file mode 100644
index 000000000..b363af55a
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diff --git a/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_multiprocessing.p.gz b/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_multiprocessing.p.gz
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diff --git a/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_os.p.gz b/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_os.p.gz
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diff --git a/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_shutil.p.gz b/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_shutil.p.gz
index 47e882ab0..8a4186b2f 100644
Binary files a/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_shutil.p.gz and b/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_shutil.p.gz differ
diff --git a/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_wmi.p.gz b/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_wmi.p.gz
index 3b91f7e0a..3747f8f03 100644
Binary files a/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_wmi.p.gz and b/nova/tests/hyperv/stubs/test_hypervapi.HyperVAPITestCase.test_get_available_resource_wmi.p.gz differ
diff --git a/nova/tests/test_hypervapi.py b/nova/tests/test_hypervapi.py
index a021dd128..6948e235b 100644
--- a/nova/tests/test_hypervapi.py
+++ b/nova/tests/test_hypervapi.py
@@ -76,7 +76,7 @@ class HyperVAPITestCase(basetestcase.BaseTestCase):
         fake_image.stub_out_image_service(self.stubs)
         fake_network.stub_out_nw_api_get_instance_nw_info(self.stubs)
 
-        def fake_dumps(msg):
+        def fake_dumps(msg, default=None, **kwargs):
             return '""'
         self.stubs.Set(json, 'dumps', fake_dumps)
 
@@ -108,7 +108,8 @@ class HyperVAPITestCase(basetestcase.BaseTestCase):
             'multiprocessing',
             '_winreg',
             'nova.virt.configdrive',
-            'nova.utils'
+            'nova.utils',
+            'ctypes'
         ]
 
         # Modules in which the mocks are going to be injected