56 lines
2.4 KiB
JavaScript
56 lines
2.4 KiB
JavaScript
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import fs from 'fs';
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import { fileURLToPath } from 'url';
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import { describe, expect, it } from 'vitest';
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import { normalizeLanguage, __testing } from './languages.js';
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// The languages a walkthrough may be written in have to agree with the locales
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// the interface ships, because the picker offers exactly those and the server
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// decides what the prompt asks for. The two lists cannot be one list — the
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// server cannot import from `packages/ui` — so they are compared here instead.
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//
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// This exists because German was added to the interface and not here. Nothing
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// broke loudly: the picker offered Deutsch, `normalizeLanguage` quietly resolved
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// it to English, and a German user paid for a walkthrough written in English
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// while the picker still said Deutsch. A drift this quiet needs a test, not
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// vigilance.
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const RUNTIME_TS = fileURLToPath(new URL('../../../../ui/src/lib/i18n/runtime.ts', import.meta.url));
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const interfaceLocales = () => {
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const source = fs.readFileSync(RUNTIME_TS, 'utf8');
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const match = source.match(/export const LOCALES = \[([^\]]*)\]/);
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if (!match) throw new Error(`Could not find LOCALES in ${RUNTIME_TS}`);
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return match[1]
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.split(',')
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.map((entry) => entry.trim().replace(/^['"]|['"]$/g, ''))
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.filter(Boolean);
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};
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describe('supported languages', () => {
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it('covers every locale the interface offers', () => {
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const missing = interfaceLocales().filter((locale) => !Object.hasOwn(__testing.LANGUAGE_NAMES, locale));
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expect(missing, `add these to LANGUAGE_NAMES in languages.js: ${missing.join(', ')}`).toEqual([]);
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});
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it('offers nothing the interface cannot label', () => {
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const locales = new Set(interfaceLocales());
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const extra = Object.keys(__testing.LANGUAGE_NAMES).filter((tag) => !locales.has(tag));
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// A language here that the interface does not know is not harmful, but it
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// is unreachable: the picker is built from the interface list.
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expect(extra, `unreachable from the picker: ${extra.join(', ')}`).toEqual([]);
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});
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it('resolves every interface locale to itself rather than to the default', () => {
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for (const locale of interfaceLocales()) {
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expect(normalizeLanguage(locale)).toBe(locale);
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}
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});
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it('names every supported language in English, for the prompt', () => {
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for (const [tag, name] of Object.entries(__testing.LANGUAGE_NAMES)) {
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expect(name, tag).toMatch(/^[A-Z][A-Za-z ]+$/);
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}
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});
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});
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