assertThat(filesystem.exists(dir / "a.0")).isTrue()
    assertThat(filesystem.exists(dir / "a.1")).isTrue()
    assertThat(filesystem.exists(dir / "journal")).isTrue()
  }

  @Test
  fun fileDeletedExternally() {
    set("a", "a", "a")
    filesystem.delete(getCleanFile("a", 1))
    assertThat(cache["a"]).isNull()
    assertThat(cache.size()).isEqualTo(0)
  }

  @Test
  fun editSameVersion() {