fetch-test-server

Node.js Fetch Test Server

This package allows you to easily run your Node.js server for integration testing, and interact with it using the Fetch API. It is similar to SuperTest, but using the Fetch API means that you can take advantage of promises, and newer ES2017 features like async/await.

Installation

npm install --save-dev fetch-test-server

Usage

Create a new instance of TestServer, passing in your HTTP server. You can then call fetch() to make requests against it. This example uses Mocha (which natively supports promises), but you can use any test framework you like.

import { assert } from 'chai';
import app from './myapp';
 
const server = new TestServer(app);
 
describe('API Integration Test', () => {
  it('responds to /user', () => {
    return server.fetch('/user').then((res) => {
      assert.strictEqual(res.status, 200);
      
      return res.json();
    }).then((body) => {
      assert.strictEqual(body.name, 'Adrian');
    });
  });
});

Using async/await (currently requires Babel or another transpiler):

import { assert } from 'chai';
import app from './myapp';
 
const server = new TestServer(app);
 
describe('API Integration Test', () => {
  it('responds to /user', async () => {
    const res = await server.fetch('/user');
    const body = await res.json();
    
    assert.strictEqual(res.status, 200);
    assert.strictEqual(body.name, 'Adrian');
  });
});

Behind the scenes, it uses node-fetch to implement the Fetch API. The server listens on a random port, and does not start listening until you first call fetch(). Your requests will be automatically held until the server is available.

You can also use helper methods to call common HTTP verbs:

server.head('/path');
server.get('/path');
server.post('/path');
server.put('/path');
server.patch('/path');
server.delete('/path');
server.options('/path');

Per the Fetch API, you can customize the request with an optional second parameter:

server.post('/users', {
  headers: { authorization: 'supersecret' },
  body: 'name=adrian',
});

Finally, if you pass an object as the body parameter, it will automatically be encoded as JSON and sent with a Content-Type: application/json header:

server.post('/users', {
  headers: { authorization: 'supersecret' },
  body: { name: 'Adrian' },
});

This is equivalent to body: JSON.stringify({ name: 'adrian' })

If you need the URL of your test server, use server.address:

server.listen().then(() => {
  // server is listening
  console.log(server.address);
});

If you want to stop the HTTP server, simply call server.close():

server.listen().then(() => {
  // server is listening
  return server.close();
}).then(() => {
  // server is now stopped
});

HTTP Framework Support

Fetch Test Server works with any Node.js HTTP framework.

Express

import app from './expressapp';
 
const server = new TestServer(app);

Koa

import app from './koaapp';
 
const server = new TestServer(app.callback());

License

MIT