diff --git a/nova/tests/unit/matchers.py b/nova/tests/unit/matchers.py
index a8842a9708..6db091178a 100644
--- a/nova/tests/unit/matchers.py
+++ b/nova/tests/unit/matchers.py
@@ -225,7 +225,7 @@ class XMLMismatch(object):
         self.actual = state.actual
 
     def describe(self):
-        return "%(path)s: XML does not match" % self.path
+        return "%(path)s: XML does not match" % {'path': self.path}
 
     def get_details(self):
         return {
diff --git a/nova/tests/unit/virt/libvirt/test_driver.py b/nova/tests/unit/virt/libvirt/test_driver.py
index f37aa110e1..dc0a4a4400 100644
--- a/nova/tests/unit/virt/libvirt/test_driver.py
+++ b/nova/tests/unit/virt/libvirt/test_driver.py
@@ -9931,7 +9931,7 @@ Active:          8381604 kB
         elif method_name == "detach_interface":
             fake_image_meta = None
         else:
-            raise ValueError("Unhandled method %" % method_name)
+            raise ValueError("Unhandled method %s" % method_name)
 
         if method_name == "attach_interface":
             self.mox.StubOutWithMock(conn.firewall_driver,
@@ -9957,7 +9957,7 @@ Active:          8381604 kB
         elif method_name == "detach_interface":
             conn.detach_interface(instance, network_info[0])
         else:
-            raise ValueError("Unhandled method %" % method_name)
+            raise ValueError("Unhandled method %s" % method_name)
 
     @mock.patch.object(lockutils, "external_lock")
     def test_attach_interface_get_config(self, mock_lock):