void assertReceiptIds(final Config config,
                          final List<UniqueId> expectedReceiptIds) {
        final List<UniqueId> actualReceiptIds = getForwardFiles(config)
                .stream()
                .map(ForwardFileItem::getContainedReceiptIds)
                .flatMap(Collection::stream)
                .toList();

        Assertions.assertThat(actualReceiptIds)
                .containsExactlyInAnyOrderElementsOf(expectedReceiptIds);
    }
Assert all the {@link UniqueId}s contained in the stored aggregates
stroom-proxy/stroom-proxy-app/src/test/java/stroom/proxy/app/MockFileDestination.java