setUp(parameters.first, parameters.second)
    cache.remove("a")
  }

  @ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)
  fun readingTheSameStreamMultipleTimes(parameters: Pair<FileSystem, Boolean>) {
    setUp(parameters.first, parameters.second)
    set("a", "a", "b")
    val snapshot = cache["a"]!!
    assertThat(snapshot.getSource(0)).isSameAs(snapshot.getSource(0))