def removedForth = entrySet.remove(new AbstractMap.SimpleEntry<>("forth", "value4"))
        def removedFifthEmptyValue = entrySet.remove(new AbstractMap.SimpleEntry<>("fifth", ""))
        def removedFifthNullValue = entrySet.remove(new AbstractMap.SimpleEntry<>("fifth", null))
        def removedNull = entrySet.remove(new AbstractMap.SimpleEntry<>(null, null))

        then:

            .map(replacedAccessor -> {
                AccessorKey key = AccessorKey.ofReplacedAccessor(upgradedProperty.getContainingType(), replacedAccessor);
                return new AbstractMap.SimpleEntry<>(key, replacedAccessor);
            });
    }

    private static <T> Map<AccessorKey, T> diff(Map<AccessorKey, T> first, Map<AccessorKey, T> second) {
        return first.entrySet().stream()