globleerrorhandler/tests/index.test.js

"Simplify error handling in Express.js using this libarary.🚀"

const { AppError, globleHandler } = require('../index');
const httpMocks = require('node-mocks-http');

describe('AppError', () => {
  it('should create an instance of AppError with correct properties', () => {
    const message = 'Test error message';
    const statusCode = 404;
    const appError = new AppError(message, statusCode);

    expect(appError).toBeInstanceOf(AppError);
    expect(appError.message).toBe(message);
    expect(appError.statusCode).toBe(statusCode);
    expect(appError.status).toBe('fail');
    expect(appError.isOperational).toBe(true);
  });
});

describe('globleHandler', () => {
  it('should handle errors and respond with default error structure', () => {
    const err = new AppError('Test error', 404);
    const req = httpMocks.createRequest();
    const res = httpMocks.createResponse();
    const next = jest.fn();

    globleHandler()(err, req, res, next);

    const data = JSON.parse(res._getData());
    expect(res.statusCode).toBe(404);
    expect(data.status).toBe('fail');
    expect(data.message).toBe('Test error');
    expect(data.stack).toBeUndefined();
    expect(data.path).toBeUndefined();
    expect(next).toHaveBeenCalled();
  });

  it('should include stack trace in the response when stack option is true', () => {
    const err = new AppError('Test error', 404);
    const req = httpMocks.createRequest();
    const res = httpMocks.createResponse();
    const next = jest.fn();

    globleHandler({ stack: true })(err, req, res, next);

    const data = JSON.parse(res._getData());
    expect(res.statusCode).toBe(404);
    expect(data.status).toBe('fail');
    expect(data.message).toBe('Test error');
    expect(data.stack).toBeDefined();
    expect(data.path).toBeUndefined();
    expect(next).toHaveBeenCalled();
  });

  it('should include only the path causing the error in the response when onlyPath option is true', () => {
    const err = new AppError('Test error', 404);
    const req = httpMocks.createRequest();
    const res = httpMocks.createResponse();
    const next = jest.fn();

    globleHandler({ onlyPath: true })(err, req, res, next);

    const data = JSON.parse(res._getData());
    expect(res.statusCode).toBe(404);
    expect(data.status).toBe('fail');
    expect(data.message).toBe('Test error');
    expect(data.stack).toBeUndefined();
    expect(data.path).toBeDefined();
    expect(next).toHaveBeenCalled();
  });
});