private boolean fileExisted(final File file) {
    if (file.exists()) {
      return true;
    } else { // check dirOfDeletedFiles
      File deleted = new File(dirOfDeletedFiles, file.getName());
      return deleted.exists();
    }
  }
Validates number of files under this.dir while ignoring this.dirOfDeletedFiles.
geode-core/src/integrationTest/java/org/apache/geode/internal/statistics/DiskSpaceLimitIntegrationTest.java