context.putUserData(CURRENT_ACCESSORS_OF_UPGRADED_PROPERTIES, diff(
            currentAccessorsOfUpgradedProperties(currentUpgradedProperties),
            currentAccessorsOfUpgradedProperties(baselineUpgradedProperties)
        ));
        context.putUserData(OLD_REMOVED_ACCESSORS_OF_UPGRADED_PROPERTIES, diff(

        String getClassName() { return null }

        Map<String, ?> getUserData() { return userData }

        Object getUserData(String key) {
            return userData[key]
        }

        void putUserData(String key, Object value) {
            userData[key] = value
        }
    }

    ClassPool instanceScopedPool = new ClassPool()

    JApiClass apiClass = Stub(JApiClass)

    def setup() {