fun constructorDoesNotAllowZeroCacheSize() {
    assertFailsWith<IllegalArgumentException> {
      DiskLruCache(filesystem, cacheDir, appVersion, 2, 0, taskRunner)
    }
  }

  @Test
  fun constructorDoesNotAllowZeroValuesPerEntry() {
    assertFailsWith<IllegalArgumentException> {
      DiskLruCache(filesystem, cacheDir, appVersion, 0, 10, taskRunner)
    }
  }

  @Test
  fun removeAbsentElement() {