expressception

Make requests against express handlers without a server.

This module supports testing express handlers and middleware without having to start an HTTP server. Instead a runtime is provided which constructs request/response objects, calls the handler or middleware with them an captures the response.

The following interfaces are currently supported:

• superagent
• supertest

Use

Once installed, the module is required and is ready to be wrapped around the express app or middleware you wish to test:

const expressception = require("expressception");

Let's take the following simple express app to demonstrate how it works:

const express = require("express");

const app = express().post("/foo/bar", (req, res) => {
  res.status(201).send();
});

Superagent

The superagent interface exposes a fully compatible

const superAgent = expressception(app).superagent();

agent.post("/foo/bar").end((err, res) => {
  if (err) {
    throw new Error("something went wrong");
  }

  console.log(`Retuned status code: ${res.status}`);
});

Supertest

Most often prtojects using superagent for testing use its counterpart supertest which extends the it and provides helper methods for making assertions on the response, such as checking the expected status code.

The entire API surface of supertest is also supported:

const testAgent = expressception(app).supertest();

(async function() {
  await testAgent
    .post("/foo/bar")
    .expect(201)
    .expect("Content-Type", /^text\/plain/)
    .expect("hello!");
})();

Compatibility

In addition to local tests the module is also tested against the supertest test suite. This is bundled in the tree and the current baseline version is 4.0.2.