creator.newSink(0).buffer().use {
      it.writeUtf8("Hello")
    }

    // Simulate a severe Filesystem failure on the first initialization.
    filesystem.setFaultyDelete(cacheDir / "k1.0.tmp", true)
    filesystem.setFaultyDelete(cacheDir, true)
    cache =
      DiskLruCache(filesystem, cacheDir, appVersion, 2, Int.MAX_VALUE.toLong(), taskRunner).also {
        toClose.add(it)
      }

  fun setFaultyWrite(
    file: Path,
    faulty: Boolean,
  ) {
    if (faulty) {
      writeFaults.add(file)
    } else {
      writeFaults.remove(file)
    }
  }

  fun setFaultyDelete(
    file: Path,
    faulty: Boolean,
  ) {
    if (faulty) {
      deleteFaults.add(file)
    } else {
      deleteFaults.remove(file)
    }
  }

  fun setFaultyRename(
    file: Path,