[JAVA] Test the integrity of the aggregation using ArchUnit ②

Let's test that "references to other aggregates are made via Id".

Test code

    static ArchRule only_access_through_id_when_depend_on_another_aggregate_root =
            .should().onlyAccessFieldsThat(new DescribedPredicate<JavaField>("not depend on another aggregate root object") {
            public boolean apply(JavaField input) {
                return !input.getClass().getSimpleName().equals("FugaRoot");

We are only testing that we are not directly referencing the aggregate route. You can make it a little more strict by determining the field name like endWith ~ ("Id") .

It is difficult to determine the aggregation route mechanically.

If you have something like @AggregateRoot, you'll be happy.

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