SOLUTION_ISSUE_126.md

Solution for Issue #126

🛠️ Proposed Solution (by Aditya Waghamare)

Analysis

The API rate limiter in src/config/rate-limit.ts uses express-rate-limit and is skipped when process.env.NODE_ENV === "test". To thoroughly exercise the 429 response path, RateLimit-* headers, and the custom message body, we need a dedicated integration/unit test file (e.g., src/__tests__/rate-limit.test.ts) that instantiates a minimal Express application with the rate limiter (overriding the test skip condition locally) and sends multiple requests to trigger the 429 rate limit.

Fix

Add a test file src/__tests__/rate-limit.test.ts implementing the test suite.

Implementation

import express from 'express';
import request from 'supertest';
import rateLimit from 'express-rate-limit';

describe('API Rate Limiter 429 Response', () => {
  let app: express.Application;

  beforeEach(() => {
    app = express();
    
    // Create a rate limiter instance with strict limits for testing the 429 path
    const testLimiter = rateLimit({
      windowMs: 1000, // 1 second
      max: 2, // limit each IP to 2 requests per windowMs
      standardHeaders: true,
      legacyHeaders: false,
      message: {
        success: false,
        message: 'Too many requests, please try again later.',
      },
      // Explicitly NOT skipping in tests for this specific test app
      skip: () => false,
    });

    app.use(testLimiter);
    app.get('/test', (req, res) => {
      res.status(200).json({ success: true, message: 'OK' });
    });
  });

  it('should return 429 status, RateLimit headers, and custom message after exceeding limit', async () => {
    // Request 1: Should succeed
    const res1 = await request(app).get('/test');
    expect(res1.status).toBe(200);
    expect(res1.headers['ratelimit-limit']).toBe('2');
    expect(res1.headers['ratelimit-remaining']).toBe('1');

    // Request 2: Should succeed
    const res2 = await request(app).get('/test');
    expect(res2.status).toBe(200);
    expect(res2.headers['ratelimit-remaining']).toBe('0');

    // Request 3: Should hit rate limit (429)
    const res3 = await request(app).get('/test');
    expect(res3.status).toBe(429);
    expect(res3.headers['ratelimit-remaining']).toBe('0');
    expect(res3.body).toEqual({
      success: false,
      message: 'Too many requests, please try again later.',
    });
  });
});

Testing

Run the test suite using Jest / Supertest: ```bash npm test src/tests/rate-limit.test.ts ```

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Submitted by Aditya Waghamare 💰 Payout Address (Base L2 / EVM): 0xb61dBcdBc3407F71EaCb64D4CBFAcf9FFfe2415C