@trieb.work/nextjs-turbo-redis-cache/test/cache-components/reconnect-socket-already-opened.spec.ts

Designed for speed, scalability, and optimized performance, nextjs-turbo-redis-cache is your custom cache handler for demanding production environments.

import { describe, it, expect, vi, afterEach } from 'vitest';

/**
 * Deterministic regression test for:
 *   "Failed to reconnect RedisCacheComponentsHandler client after connection loss: Error: Socket already opened"
 *
 * We simulate the node-redis client emitting an error while its socket is still considered open,
 * and we stub connect() to reject with "Socket already opened".
 */

describe('RedisCacheComponentsHandler reconnect logic', () => {
  afterEach(() => {
    vi.useRealTimers();
    vi.restoreAllMocks();
  });

  it('does not call connect() when an error occurs but the socket is already open (prevents "Socket already opened")', async () => {
    vi.useFakeTimers();
    vi.resetModules();

    const consoleError = vi
      .spyOn(console, 'error')
      .mockImplementation(() => {});

    const { getRedisCacheComponentsHandler } = await import('../../src');

    const handler = getRedisCacheComponentsHandler({
      redisUrl: 'redis://127.0.0.1:6399',
      clientOptions: {
        // Avoid queueing commands in tests.
        disableOfflineQueue: true,
      } as any,
    });

    const client = (handler as any).client;

    // Simulate a connection-loss situation where the socket is still open.
    Object.defineProperty(client, 'isOpen', { value: true });
    Object.defineProperty(client, 'isReady', { value: false });

    // Stub connect() so we can assert it is NOT called.
    const connectSpy = vi.spyOn(client, 'connect');

    // Trigger the handler's on('error') callback.
    client.emit('error', new Error('ECONNREFUSED 127.0.0.1:6379'));

    // Reconnect is scheduled after 1000ms.
    await vi.advanceTimersByTimeAsync(1100);

    expect(connectSpy).not.toHaveBeenCalled();

    const msgs = consoleError.mock.calls
      .map((c) => c.map(String).join(' '))
      .join('\n');

    expect(msgs).not.toContain(
      'Failed to reconnect RedisCacheComponentsHandler client after connection loss:',
    );
    expect(msgs).not.toContain('Socket already opened');
  });
});