public void validate(Map<String, NewDocumentType> documentDefinitions,
                         Set<NewDocumentType> globallyDistributedDocuments) {
        verifyReferredDocumentsArePresent(documentDefinitions);
        verifyReferredDocumentsAreGlobal(documentDefinitions, globallyDistributedDocuments);
    }
@Test
    void validation_succeeds_on_no_documents() {
        new GlobalDistributionValidator()
                .validate(Map.of(), Set.of());
    }