// Cause the rebuild action to fail.
    filesystem.setFaultyRename(cacheDir / DiskLruCache.JOURNAL_FILE_BACKUP, true)
    taskFaker.runNextTask()
    assertThat(cache.remove("a")).isTrue()
    assertAbsent("a")

    // Let the rebuild complete successfully.
    filesystem.setFaultyRename(cacheDir / DiskLruCache.JOURNAL_FILE_BACKUP, false)
    taskFaker.runNextTask()
    assertJournalEquals("CLEAN b 1 1")
  }

  }

  @Synchronized
  @Throws(IOException::class)
  fun initialize() {
    this.assertThreadHoldsLock()

    if (initialized) {
      return // Already initialized.
    }

    // If a bkp file exists, use it instead.
    if (fileSystem.exists(journalFileBackup)) {
      // If journal file also exists just delete backup file.