Export the Extensions URL functions for overriding.
diff --git a/openstack/common/extensions/urls_test.go b/openstack/common/extensions/urls_test.go
index 94c36cc..3223b1c 100644
--- a/openstack/common/extensions/urls_test.go
+++ b/openstack/common/extensions/urls_test.go
@@ -14,13 +14,13 @@
 }
 
 func TestExtensionURL(t *testing.T) {
-	actual := extensionURL(endpointClient(), "agent")
+	actual := ExtensionURL(endpointClient(), "agent")
 	expected := endpoint + "extensions/agent"
 	th.AssertEquals(t, expected, actual)
 }
 
 func TestListExtensionURL(t *testing.T) {
-	actual := listExtensionURL(endpointClient())
+	actual := ListExtensionURL(endpointClient())
 	expected := endpoint + "extensions"
 	th.AssertEquals(t, expected, actual)
 }