@BeforeEach
  fun setUp() {
    val path = "/okhttp3/internal/idna/IdnaMappingTable.txt".toPath()
    val plainTable =
      FileSystem.RESOURCES.read(path) {
        readPlainTextIdnaMappingTable()
      }
    table = plainTable
    val data = buildIdnaMappingTableData(plainTable)
    compactTable =
      IdnaMappingTable(
        sections = data.sections,
        ranges = data.ranges,

 *
 * For lines that contain a mapping target, the next thing is a sequence of hex code points (like
 * 0031 2044 0034).
 *
 * All other data is ignored.
 */
fun BufferedSource.readPlainTextIdnaMappingTable(): SimpleIdnaMappingTable {
  val mappedTo = Buffer()
  val result = mutableListOf<Mapping>()

  while (!exhausted()) {
    // Skip comment and empty lines.
    when (select(optionsDelimiter)) {