List<DependencyLink> getDependencyLinks(Set<String> lowTraceIdsInRange) {
    if (lowTraceIdsInRange.isEmpty()) return Collections.emptyList();
    DependencyLinker linksBuilder = new DependencyLinker();
    for (String lowTraceId : lowTraceIdsInRange) {
      linksBuilder.putTrace(spansByTraceId(lowTraceId));
    }
    return linksBuilder.link();
  }
Used for testing. Returns all dependency links unconditionally.
zipkin/src/main/java/zipkin2/storage/InMemoryStorage.java