202C; POP DIRECTIONAL FORMATTING
   202D; LEFT-TO-RIGHT OVERRIDE
   202E; RIGHT-TO-LEFT OVERRIDE
   206A; INHIBIT SYMMETRIC SWAPPING
   206B; ACTIVATE SYMMETRIC SWAPPING
   206C; INHIBIT ARABIC FORM SHAPING
   206D; ACTIVATE ARABIC FORM SHAPING
   206E; NATIONAL DIGIT SHAPES

import kotlin.test.Test
import kotlin.test.assertEquals
import kotlin.test.assertNull

class PunycodeTest {
  /** https://datatracker.ietf.org/doc/html/rfc3492#section-7.1 */
  @Test fun rfc3492Samples() {
    // (A) Arabic (Egyptian)
    testEncodeDecode(
      unicode = "ليهمابتكلموشعربي؟",
      punycode = "xn--egbpdaj6bu4bxfgehfvwxn",
    )

    // (B) Chinese (simplified)
    testEncodeDecode(
      unicode = "他们为什么不说中文",

0656..0658    ; valid                                  # 4.0  ARABIC SUBSCRIPT ALEF..ARABIC MARK NOON GHUNNA
0659..065E    ; valid                                  # 4.1  ARABIC ZWARAKAY..ARABIC FATHA WITH TWO DOTS
065F          ; valid                                  # 6.0  ARABIC WAVY HAMZA BELOW
0660..0669    ; valid                                  # 1.1  ARABIC-INDIC DIGIT ZERO..ARABIC-INDIC DIGIT NINE

   0080-009F; [CONTROL CHARACTERS]
   06DD; ARABIC END OF AYAH
   070F; SYRIAC ABBREVIATION MARK
   180E; MONGOLIAN VOWEL SEPARATOR
   200C; ZERO WIDTH NON-JOINER
   200D; ZERO WIDTH JOINER
   2028; LINE SEPARATOR
   2029; PARAGRAPH SEPARATOR
   2060; WORD JOINER
   2061; FUNCTION APPLICATION
   2062; INVISIBLE TIMES
   2063; INVISIBLE SEPARATOR
   206A-206F; [CONTROL CHARACTERS]
   FEFF; ZERO WIDTH NO-BREAK SPACE

рф

// xn--wgbl6a ("Qatar", Arabic) : QA
// http://www.ict.gov.qa/
قطر

// xn--mgberp4a5d4ar ("AlSaudiah", Arabic) : SA
// http://www.nic.net.sa/
السعودية

// xn--mgberp4a5d4a87g ("AlSaudiah", Arabic, variant)  : SA
السعودیة

// xn--mgbqly7c0a67fbc ("AlSaudiah", Arabic, variant) : SA
السعودیۃ

// xn--mgbqly7cvafr ("AlSaudiah", Arabic, variant) : SA
السعوديه

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