initial

tests/transliterate.test.js

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+"use strict";
+
+const test = require("node:test");
+const assert = require("node:assert/strict");
+const { characterMap, transliterate } = require("../transliterate.js");
+
+test("maps every modern Russian uppercase and lowercase letter", () => {
+  const russian = "АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдеёжзийклмнопрстуфхцчшщъыьэюя";
+  const expected = "ⰀⰁⰂⰃⰄⰅⰦⰆⰈⰉⰋⰍⰎⰏⰐⰑⰒⰓⰔⰕⰖⰗⰘⰜⰝⰞⰛⰟⰠⰡⰅⰣⰤⰰⰱⰲⰳⰴⰵⱖⰶⰸⰹⰻⰽⰾⰿⱀⱁⱂⱃⱄⱅⱆⱇⱈⱌⱍⱎⱋⱏⱐⱑⰵⱓⱔ";
+
+  assert.equal(characterMap.size, 66);
+  assert.equal(transliterate(russian), expected);
+});
+
+test("preserves case, punctuation, spacing, digits, and non-Russian text", () => {
+  assert.equal(
+    transliterate("Привет, мир! Ёж № 5 — JavaScript."),
+    "Ⱂⱃⰹⰲⰵⱅ, ⰿⰹⱃ! Ⱖⰶ № 5 — JavaScript."
+  );
+});
+
+test("leaves already Glagolitic and unmapped Cyrillic letters unchanged", () => {
+  const text = "Ⰳⰾⰰⰳⱁⰾⰹⱌⰰ · ІЇЄҐЎЅ · 123";
+  assert.equal(transliterate(text), text);
+});