*/
  fun readCodePointMapping(path: Path): MappingListCodePointMapping {
    fileSystem.source(path).buffer().use { source ->
      return source.readCodePointMappings()
    }
  }
}

private val optionsSemicolon =
  Options.of(
    // 0 is ';'.
    ";".encodeUtf8(),
  )

private val optionsSemicolonOrNewlineOrDash =
  Options.of(

      """
      |    180C; ; Map to nothing
      |    0041; 0061; Case map
      |    0390; 03B9 0308 0301; Case map
      |
      """.trimMargin(),
    )

    val mappings = buffer.readCodePointMappings()
    assertEquals(
      mapOf(
        // Map to nothing.
        0x180c to "",
        // Case map.
        'A'.code to "a",
        // Case map.
        'ΐ'.code to "\u03B9\u0308\u0301",
      ),