scrabble-game/ui/src/lib/offline.test.ts

import { describe, it, expect, beforeEach } from 'vitest';
import { clearOfflinePref, offlinePreloadEligible } from './offline';

// A minimal in-memory localStorage for the cleanup test (node has none).
beforeEach(() => {
  const store = new Map<string, string>();
  (globalThis as unknown as { localStorage: Storage }).localStorage = {
    getItem: (k: string) => store.get(k) ?? null,
    setItem: (k: string, v: string) => void store.set(k, v),
    removeItem: (k: string) => void store.delete(k),
    clear: () => store.clear(),
    key: () => null,
    length: 0,
  } as Storage;
});

describe('offline helpers', () => {
  it('offlinePreloadEligible requires a standalone PWA with email, online, outside mini-apps', () => {
    const base = { hasEmail: true, standalone: true, inTelegram: false, inVK: false, online: true };
    expect(offlinePreloadEligible(base)).toBe(true);
    expect(offlinePreloadEligible({ ...base, hasEmail: false })).toBe(false);
    expect(offlinePreloadEligible({ ...base, standalone: false })).toBe(false);
    expect(offlinePreloadEligible({ ...base, inTelegram: true })).toBe(false);
    expect(offlinePreloadEligible({ ...base, inVK: true })).toBe(false);
    expect(offlinePreloadEligible({ ...base, online: false })).toBe(false);
  });

  it('clearOfflinePref removes the retired deliberate-offline key (best-effort, idempotent)', () => {
    localStorage.setItem('scrabble.offlineMode', '1');
    clearOfflinePref();
    expect(localStorage.getItem('scrabble.offlineMode')).toBeNull();
    // Idempotent: a second call on an already-clear key is a no-op, not an error.
    expect(() => clearOfflinePref()).not.toThrow();
  });
});