public Optional<DbEntityCatalogEntry> getByCollectionName(final String collection) {
        return Optional.ofNullable(entitiesByCollectionName.get(collection));
    }
@Test
    void returnsEmptyOptionalsOnEmptyCatalog() {
        DbEntitiesCatalog catalog = new DbEntitiesCatalog(List.of());

        assertThat(catalog.getByCollectionName("Guadalajara")).isEmpty();
    }