void start(TestIdentifier id) {
        synchronized (monitor) {
            NamedNode child = id.isTest() ? new TestNode(current, id.getUniqueIdObject().getLastSegment().getValue(), id.getDisplayName(), clock.instant())
                                          : new ContainerNode(current, id.getUniqueIdObject().getLastSegment().getValue(), id.getDisplayName(), clock.instant());
            verifyStructure(child, id.getUniqueIdObject());
            current.children.add(child);
            current = child;
        }
    }
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