val mapping =
      MappingListCodePointMapping(
        mutableMapOf<Int, String>()
          .apply {
            putAll(readCodePointMapping(base / "rfc3454.B.1.txt").mappings)
            putAll(readCodePointMapping(base / "rfc3454.B.2.txt").mappings)
          },
      )
    val prohibitSet =
      RangeListCodePointSet(
        ranges =
          mutableListOf<IntRange>()

        0x0234..0x024f,
        // [CONTROL CHARACTERS].
        0x0000..0x001f,
        // DELETE.
        0x007f..0x007f,
      ),
      rangeList.ranges,
    )
  }

  @Test fun readCodePointMapping() {
    val buffer = Buffer()
    buffer.writeUtf8(
      """
      |    180C; ; Map to nothing
      |    0041; 0061; Case map
      |    0390; 03B9 0308 0301; Case map
      |
      """.trimMargin(),