Create def sec group
diff --git a/openstack/compute/v2/extensions/defsecrules/fixtures.go b/openstack/compute/v2/extensions/defsecrules/fixtures.go
index 0b11338..c0dc62b 100644
--- a/openstack/compute/v2/extensions/defsecrules/fixtures.go
+++ b/openstack/compute/v2/extensions/defsecrules/fixtures.go
@@ -36,3 +36,39 @@
       `)
 	})
 }
+
+func mockCreateRuleResponse(t *testing.T) {
+	th.Mux.HandleFunc(rootPath, func(w http.ResponseWriter, r *http.Request) {
+		th.TestMethod(t, r, "POST")
+		th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
+
+		th.TestJSONRequest(t, r, `
+{
+  "security_group_default_rule": {
+    "ip_protocol": "TCP",
+    "from_port": 80,
+    "to_port": 80,
+    "cidr": "10.10.12.0/24"
+  }
+}
+	`)
+
+		w.Header().Add("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+
+		fmt.Fprintf(w, `
+{
+  "security_group_default_rule": {
+    "from_port": 80,
+    "id": 1,
+    "ip_protocol": "TCP",
+    "ip_range": {
+      "cidr": "10.10.12.0/24"
+    },
+    "to_port": 80,
+		"id": "b0e0d7dd-2ca4-49a9-ba82-c44a148b66a5"
+  }
+}
+`)
+	})
+}