nest/packages/platform-fastify/test/adapters/fastify-adapter.spec.ts

import { FastifyAdapter } from '../../adapters/fastify-adapter';
import { createError } from '@fastify/error';
import { HttpException } from '@nestjs/common';

describe('FastifyAdapter', () => {
  let fastifyAdapter: FastifyAdapter;

  beforeEach(() => {
    fastifyAdapter = new FastifyAdapter();
  });

  afterEach(() => vi.restoreAllMocks());

  describe('mapException', () => {
    it('should map FastifyError with status code to HttpException', () => {
      const FastifyErrorCls = createError(
        'FST_ERR_CTP_INVALID_MEDIA_TYPE',
        'Unsupported Media Type: %s',
        415,
      );
      const error = new FastifyErrorCls();

      const result = fastifyAdapter.mapException(error) as HttpException;

      expect(result).to.be.instanceOf(HttpException);
      expect(result.message).to.equal(error.message);
      expect(result.getStatus()).to.equal(415);
    });

    it('should return FastifyError without user status code to Internal Server Error HttpException', () => {
      const FastifyErrorCls = createError(
        'FST_WITHOUT_STATUS_CODE',
        'Error without status code',
      );
      const error = new FastifyErrorCls();

      const result = fastifyAdapter.mapException(error) as HttpException;
      expect(result).to.be.instanceOf(HttpException);
      expect(result.message).to.equal(error.message);
      expect(result.getStatus()).to.equal(500);
    });

    it('should return error if it is not FastifyError', () => {
      const error = new Error('Test error');
      const result = fastifyAdapter.mapException(error);
      expect(result).to.equal(error);
    });
  });
});