Map<Status, Long> tally() {
            Map<Status, Long> tally = new EnumMap<>(Status.class);
            for (Node child : children)
                child.tally().forEach((status, count) -> tally.merge(status, count, Long::sum));

            return tally;
        }
Verify the path from the root to the current node corresponds to the given id.
vespa-osgi-testrunner/src/main/java/com/yahoo/vespa/testrunner/TestReport.java