setUp(parameters.first, parameters.second)
    cache.close()
    createNewCacheWithSize(10)
    set("a", "aa", "aaa") // size 5
    val snapshot = cache["a"]!!
    snapshot.close()
    set("b", "bb", "bbb") // size 5
    set("c", "cc", "ccc") // size 5; will evict 'A'
    set("a", "a", "aaaa") // size 5; will evict 'B'
    cache.flush()
    assertThat(snapshot.edit()).isNull()
  }

   * example:
   *
   * {@snippet :
   * CharMatcher.is('a').retainFrom("bazaar")
   * }
   *
   * ... returns {@code "aaa"}.
   */
  public String retainFrom(CharSequence sequence) {
    return negate().removeFrom(sequence);
  }

  /**
   * Returns a string copy of the input character sequence, with each matching BMP character