@ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)
  fun isClosed_uninitializedCache(parameters: Pair<FileSystem, Boolean>) {
    setUp(parameters.first, parameters.second)
    // Create an uninitialized cache.
    cache =
      DiskLruCache(filesystem, cacheDir, appVersion, 2, Int.MAX_VALUE.toLong(), taskRunner).also {
        toClose.add(it)
      }
    assertThat(cache.isClosed()).isFalse()