Ilia Denisov
90f0424de2
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The UI language follows the device (the local choice / system guess) and is deliberately not overridden from the account, but the advertising banner and out-of-app push routing are resolved server-side from preferred_language. A saved device choice the account had not recorded — picked while a guest, or differing from the Telegram system-language seed — left the banner (and pushes) in the wrong language until a Settings change rewrote preferred_language. On profile load (adoptSession and the in-place link path) push the saved local choice to the account when it differs (new pure helper languageNeedsServerSync; no-op for guests and when already equal), so the banner and pushes match the visible UI from the first open. Unit-tested.
28 lines
1.2 KiB
TypeScript
28 lines
1.2 KiB
TypeScript
import { describe, it, expect } from 'vitest';
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import { languageNeedsServerSync } from './language';
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import type { Profile } from './model';
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// The reconciler only reads isGuest + preferredLanguage; a partial cast keeps the fixture small.
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const profile = (over: Partial<Profile>): Profile => ({ isGuest: false, preferredLanguage: 'en', ...over }) as Profile;
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describe('languageNeedsServerSync', () => {
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it('is false without a profile', () => {
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expect(languageNeedsServerSync(null, 'ru')).toBe(false);
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expect(languageNeedsServerSync(undefined, 'ru')).toBe(false);
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});
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it('is false for a guest — guests keep only the client preference', () => {
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expect(languageNeedsServerSync(profile({ isGuest: true, preferredLanguage: 'en' }), 'ru')).toBe(false);
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});
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it('is false when the account already matches the locale', () => {
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expect(languageNeedsServerSync(profile({ preferredLanguage: 'ru' }), 'ru')).toBe(false);
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});
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it('is true for a real account whose stored language differs (banner + push follow it)', () => {
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expect(languageNeedsServerSync(profile({ preferredLanguage: 'en' }), 'ru')).toBe(true);
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expect(languageNeedsServerSync(profile({ preferredLanguage: 'ru' }), 'en')).toBe(true);
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});
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});
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