@ingeze/api-error/dist/test/handlers/express.test.js

A TypeScript library for handling HTTP errors in Express, NestJS, and Fastify APIs.

import { beforeEach, describe } from "node:test";
import { ErrorHandler } from "src/errors/error-handler";
import { expressErrorMiddleware } from "src/handlers/express";
describe("expressHandlerMiddleware with mocks", () => {
  let req;
  let res = {
    status: jest.fn().mockReturnThis(),
    json: jest.fn().mockReturnThis()
  };
  let next;
  beforeEach(() => {
    req = {};
    res = {
      status: jest.fn().mockReturnThis(),
      json: jest.fn().mockReturnThis()
    };
    next = jest.fn();
  });
  it("handles custom ErrorHandler", () => {
    const err = new ErrorHandler("Custom error", 400, "CUSTOM_ERROR", { id: 1, info: "Custom error" });
    expressErrorMiddleware(err, req, res, next);
    expect(res.status).toHaveBeenCalledWith(400);
    expect(res.json).toHaveBeenCalledWith(err.toJSON());
  });
  it("handles generic error", () => {
    const err = new Error("Something went wrong");
    expressErrorMiddleware(err, req, res, next);
    expect(res.status).toHaveBeenCalledWith(500);
    expect(res.json).toHaveBeenCalledWith({
      success: false,
      statusCode: 500,
      type: "INTERNAL_SERVER_ERROR",
      message: "An unexpected error occurred"
    });
  });
});
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