hmpo-reqres

Stub request and response objects for testing express applications and middleware

Creates default request and response object with configurable values, and methods stubbed with sinon.stub.

Usage

Using default request properties:

const middleware = (req, res, next) => {
  req.session.path = req.path;
};
const reqres = require("reqres");

describe("my middleware", () => {
  let req;
  let res;

  beforeEach(() => {
    (req = reqres.req()), (res = reqres.res());
  });

  it("request has properties", () => {
    middleware(req, res, (err) => {
      req.session.path.should.equal("/");
      done(err);
    });
  });
});

Testing a router:

const router = require("express").Router();
router
  .route("/foo")
  .get((req, res, next) => {
    req.user = req.session.username;
    next();
  })
  .post((req, res, next) => {
    req.session.username = req.body.user;
    next();
  });
const reqres = require("reqres");

describe("my router", () => {
  let req;
  let res;

  beforeEach(() => {
    req = reqres.req({ url: "/foo", session: { username: "hmpo" } });
    res = reqres.res();
  });

  it("sets username from session to req.user", (done) => {
    router(req, res, () => {
      req.user.should.equal("hmpo");
      done();
    });
  });

  it("sets POST-ed username to session", (done) => {
    req.method = "POST";
    req.body = { user: "user" };
    router(req, res, () => {
      req.session.username.should.equal("user");
      done();
    });
  });
});

Testing response methods:

All methods which would normally send a response (and so end the middleware chain) e.g. json, send will emit an "end" event, so this can be bound onto for running assertions.

const router = require("express").Router();
router.route("/foo").get((req, res) => {
  res.json({ user: req.session.username });
});
const reqres = require("reqres");

describe("my router", () => {
  let req;
  let res;

  beforeEach(() => {
    req = reqres.req({ url: "/foo", session: { username: "hmpo" } });
    res = reqres.res();
  });

  it("responds with json showing user from session", (done) => {
    router.handle(req, res);
    res.on("end", () => {
      res.json.should.have.been.calledWithExactly({ user: "hmpo" });
      done();
    });
  });
});

Customisation

If you want to use a different version of sinon to that which is included in reqres - or indeed a completely different stub/spy library - then you can set the sinon property to your own local version.

const reqres = require("reqres");
reqres.sinon = require("sinon");