context.putUserData(CURRENT_ACCESSORS_OF_UPGRADED_PROPERTIES, diff(
            mapCurrentAccessorsOfUpgradedProperties(currentUpgradedProperties),
            mapCurrentAccessorsOfUpgradedProperties(baselineUpgradedProperties)
        ));
        context.putUserData(OLD_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() {

                ]
            }

            @Override
            <T> T getUserData(String key) {
                getUserData()[key]
            }

            @Override
            <T> void putUserData(String key, T value) {
                getUserData().put(key, value)
            }
        }
        rule
    }