diff --git a/openstack/db/v1/instances/fixtures.go b/openstack/db/v1/instances/fixtures.go
index 16b4006..9cbcb3a 100644
--- a/openstack/db/v1/instances/fixtures.go
+++ b/openstack/db/v1/instances/fixtures.go
@@ -154,3 +154,13 @@
 		w.WriteHeader(http.StatusAccepted)
 	})
 }
+
+func HandleEnableRootUserSuccessfully(t *testing.T, id string) {
+	th.Mux.HandleFunc("/instances/"+id+"/root", func(w http.ResponseWriter, r *http.Request) {
+		th.TestMethod(t, r, "POST")
+		th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
+
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprintf(w, `{"user":{"name":"root","password":"secretsecret"}}`)
+	})
+}