fileSystem: FileSystem,
) : ForwardingFileSystem(fileSystem) {
  fun log(line: String) {
    println(line)
  }

  override fun appendingSink(
    file: Path,
    mustExist: Boolean,
  ): Sink {
    log("appendingSink($file)")

    return super.appendingSink(file, mustExist)
  }

  override fun atomicMove(
    source: Path,
    target: Path,
  ) {
    log("atomicMove($source, $target)")

  ) {
    if (deleteFaults.contains(fileOrDirectory)) throw IOException("boom!")
    super.deleteRecursively(fileOrDirectory, mustExist)
  }

  override fun appendingSink(
    file: Path,
    mustExist: Boolean,
  ): Sink = FaultySink(super.appendingSink(file, mustExist), file)

  override fun sink(
    file: Path,
    mustCreate: Boolean,
  ): Sink = FaultySink(super.sink(file, mustCreate), file)

        journalWriter = newJournalWriter()
      }
    }
  }

  @Throws(FileNotFoundException::class)
  private fun newJournalWriter(): BufferedSink {
    val fileSink = fileSystem.appendingSink(journalFile)
    val faultHidingSink =
      FaultHidingSink(fileSink) {
        assertLockHeld()
        hasJournalErrors = true
      }
    return faultHidingSink.buffer()
  }

      "metadataOrNull:/cache",
      "sink:/cache/journal.tmp",
      "metadataOrNull:/cache/journal",
      "atomicMove:/cache/journal.tmp",
      "atomicMove:/cache/journal",
      "appendingSink:/cache/journal",
    )
    events.clear()
    c.size()
    assertThat(events).isEmpty()
  }

  private fun assertFullyCached(response: MockResponse) {