filesystem.setFaultyDelete(cacheDir, false)
    val snapshot = cache["k1"]
    assertThat(snapshot).isNull()
  }

  @ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)
  fun validateKey(parameters: Pair<FileSystem, Boolean>) {
    setUp(parameters.first, parameters.second)
    var key = ""
    assertFailsWith<IllegalArgumentException> {
      key = "has_space "
      cache.edit(key)