assertThat(cache.isClosed()).isFalse()
    cache.close()
    assertThat(cache.isClosed()).isTrue()
  }

  @ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)
  fun journalWriteFailsDuringEdit(parameters: Pair<FileSystem, Boolean>) {
    setUp(parameters.first, parameters.second)
    set("a", "a", "a")
    set("b", "b", "b")

    // We can't begin the edit if writing 'DIRTY' fails.