import Fastify from 'fastify';
import { describe, expect, it } from 'vitest';
import { registerJsonBodyParser } from '../../utils/json-parser.js';

describe('registerJsonBodyParser', () => {
  it('treats an empty application/json body as an empty object', async () => {
    const app = Fastify();
    registerJsonBodyParser(app);
    app.post('/empty-json', async (request) => ({ body: request.body }));

    const response = await app.inject({
      method: 'POST',
      url: '/empty-json',
      headers: { 'content-type': 'application/json' },
      payload: '',
    });

    expect(response.statusCode).toBe(200);
    expect(response.json()).toEqual({ body: {} });
  });

  it('still rejects malformed JSON', async () => {
    const app = Fastify();
    registerJsonBodyParser(app);
    app.post('/bad-json', async () => ({ ok: true }));

    const response = await app.inject({
      method: 'POST',
      url: '/bad-json',
      headers: { 'content-type': 'application/json' },
      payload: '{',
    });

    expect(response.statusCode).toBe(400);
  });
});