private static File @Nullable [] getTraceFiles(CoverageSuitesBundle bundle) {
    final List<File> files = new ArrayList<>();
    for (CoverageSuite coverageSuite : bundle.getSuites()) {
      final File tracesDir = getTracesDirectory(coverageSuite);
      final File[] suiteFiles = tracesDir.listFiles();
      if (suiteFiles != null) {
        Collections.addAll(files, suiteFiles);
      }
    }

    return files.isEmpty() ? null : files.toArray(new File[0]);
  }
private static File @Nullable [] getTraceFiles(CoverageSuitesBundle bundle)