PackageSet minus(PackageSet other) {
            Set<PackageInfo> diff = Sets.difference(new HashSet<>(this.packages), new HashSet<>(other.packages));
            return new PackageSet(diff.stream().sorted().toList());
        }
Integration tests for {@link ExportPackages}.

@author gjoranv
jdisc_core/src/test/java/com/yahoo/jdisc/core/ExportPackagesIT.java