56 lines
2.0 KiB
TypeScript
56 lines
2.0 KiB
TypeScript
 
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import { test } from 'node:test';
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import assert from 'node:assert/strict';
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import {
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normalizeLang,
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sameLanguage,
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languageName,
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isSupportedTargetLang,
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TRANSLATE_TARGET_LANGUAGES,
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} from './langUtils';
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test('normalizeLang: base subtag, lowercased', () => {
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assert.equal(normalizeLang('en-US'), 'en');
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assert.equal(normalizeLang('ZH'), 'zh');
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assert.equal(normalizeLang('pt_BR'), 'pt');
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assert.equal(normalizeLang(' De '), 'de');
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assert.equal(normalizeLang(''), '');
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assert.equal(normalizeLang(undefined), '');
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assert.equal(normalizeLang(null), '');
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});
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test('normalizeLang: keeps Chinese script subtag', () => {
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assert.equal(normalizeLang('zh-Hant'), 'zh-hant');
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assert.equal(normalizeLang('zh-Hans-CN'), 'zh-hans');
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assert.equal(normalizeLang('zh-CN'), 'zh'); // region-only collapses to base
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});
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test('sameLanguage: compares normalized bases', () => {
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assert.equal(sameLanguage('en', 'en-US'), true);
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assert.equal(sameLanguage('EN', 'en'), true);
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assert.equal(sameLanguage('en', 'de'), false);
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assert.equal(sameLanguage('', 'en'), false); // empty is never "same"
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assert.equal(sameLanguage(undefined, undefined), false);
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});
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test('languageName: resolves common codes', () => {
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// Intl.DisplayNames is available in node; assert it returns a real name (not
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// the bare code) for a known language.
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const de = languageName('de');
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assert.ok(de.length > 0 && de.toLowerCase() !== 'de');
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// Unknown/garbage code falls back to the code itself.
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assert.equal(languageName('zz-not-a-lang'), 'zz-not-a-lang'.split('-')[0]);
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});
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test('isSupportedTargetLang: curated membership', () => {
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assert.equal(isSupportedTargetLang('en'), true);
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assert.equal(isSupportedTargetLang('DE'), true);
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assert.equal(isSupportedTargetLang('pt-BR'), true);
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assert.equal(isSupportedTargetLang('xx'), false);
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});
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test('curated list: unique codes, English present', () => {
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const codes = TRANSLATE_TARGET_LANGUAGES.map((l) => l.code);
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assert.equal(new Set(codes).size, codes.length);
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assert.ok(codes.includes('en'));
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});
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