assertThat(filesystem.exists(dir / "a.1")).isTrue()
    assertThat(filesystem.exists(dir / "journal")).isTrue()
  }

  @ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)
  fun fileDeletedExternally(parameters: Pair<FileSystem, Boolean>) {
    setUp(parameters.first, parameters.second)
    set("a", "a", "a")
    filesystem.delete(getCleanFile("a", 1))
    assertThat(cache["a"]).isNull()