Chai HTTP

HTTP integration testing with Chai assertions.

Features

integration test request composition
test http apps or external services
assertions for common http tasks
chai expect and should interfaces

Installation

This is a addon plugin for the Chai Assertion Library. Install via npm.

npm install chai-http

Plugin

Use this plugin as you would all other Chai plugins.

var chai = require('chai')
  , chaiHttp = require('chai-http');

chai.use(chaiHttp);

To use Chai HTTP on a web page, just include the dist/chai-http.js file:

<script src="chai.js"></script>
<script src="chai-http.js"></script>
<script>
  chai.use(chaiHttp);
</script>

Integration Testing

Chai HTTP provides an interface for live integration testing via superagent. To do this, you must first construct a request to an application or url.

Upon construction you are provided a chainable api that allows you to specify the http VERB request (get, post, etc) that you wish to invoke.

Application / Server

You may use a function (such as an express or connect app) or a node.js http(s) server as the foundation for your request. If the server is not running, chai-http will find a suitable port to listen on for a given test.

Note: This feature is only supported on Node.js, not in web browsers.

chai.request(app)
  .get('/')

URL

You may also use a base url as the foundation of your request.

chai.request('http://localhost:8080')
  .get('/')

Setting up requests

Once a request is created with a given VERB, it can have headers, form data, json, or even file attachments added to it, all with a simple API:

// Send some JSON
chai.request(app)
  .put('/user/me')
  .set('X-API-Key', 'foobar')
  .send({ password: '123', confirmPassword: '123' })

// Send some Form Data
chai.request(app)
  .post('/user/me')
  .type('form')
  .send({
    '_method': 'put',
    'password': '123',
    'confirmPassword': '123'
  })

// Attach a file
chai.request(app)
  .post('/user/avatar')
  .attach('imageField', fs.readFileSync('avatar.png'), 'avatar.png')

// Authenticate with Basic authentication
chai.request(app)
  .get('/protected')
  .auth('user', 'pass')

// Chain some GET query parameters
chai.request(app)
  .get('/search')
  .query({name: 'foo', limit: 10}) // /search?name=foo&limit=10

Dealing with the response - traditional

In the following examples we use Chai's Expect assertion library:

var expect = chai.expect;

To make the request and assert on its response, the end method can be used:

chai.request(app)
  .put('/user/me')
  .send({ password: '123', confirmPassword: '123' })
  .end(function (err, res) {
     expect(err).to.be.null;
     expect(res).to.have.status(200);
  });

Caveat

Because the end function is passed a callback, assertions are run asynchronously. Therefore, a mechanism must be used to notify the testing framework that the callback has completed. Otherwise, the test will pass before the assertions are checked.

For example, in the Mocha test framework, this is accomplished using the done callback, which signal that the callback has completed, and the assertions can be verified:

it('fails, as expected', function(done) { // <= Pass in done callback
  chai.request('http://localhost:8080')
  .get('/')
  .end(function(err, res) {
    expect(res).to.have.status(123);
    done();                               // <= Call done to signal callback end
  });
});

it('succeeds silently!', function() {   // <= No done callback
  chai.request('http://localhost:8080')
  .get('/')
  .end(function(err, res) {
    expect(res).to.have.status(123);    // <= Test completes before this runs
  });
});

When done is passed in, Mocha will wait until the call to done(), or until the timeout expires. done also accepts an error parameter when signaling completion.

Dealing with the response - Promises

If Promise is available, request() becomes a Promise capable library - and chaining of thens becomes possible:

chai.request(app)
  .put('/user/me')
  .send({ password: '123', confirmPassword: '123' })
  .then(function (res) {
     expect(res).to.have.status(200);
  })
  .catch(function (err) {
     throw err;
  });

Note: Node.js version 0.10.x and some older web browsers do not have native promise support. You can use any spec compliant library, such as:

kriskowal/q
stefanpenner/es6-promise
petkaantonov/bluebird
then/promise You will need to set the library you use to global.Promise, before requiring in chai-http. For example:

// Add promise support if this does not exist natively.
if (!global.Promise) {
  global.Promise = require('q');
}
var chai = require('chai');
chai.use(require('chai-http'));

Retaining cookies with each request

Sometimes you need to keep cookies from one request, and send them with the next (for example, when you want to login with the first request, then access an authenticated-only resource later). For this, .request.agent() is available:

// Log in
var agent = chai.request.agent(app)
agent
  .post('/session')
  .send({ username: 'me', password: '123' })
  .then(function (res) {
    expect(res).to.have.cookie('sessionid');
    // The `agent` now has the sessionid cookie saved, and will send it
    // back to the server in the next request:
    return agent.get('/user/me')
      .then(function (res) {
         expect(res).to.have.status(200);
      });
  });

Assertions

The Chai HTTP module provides a number of assertions for the expect and should interfaces.

.status (code)

@param {Number} status number

Assert that a response has a supplied status.

expect(res).to.have.status(200);

.header (key[, value])

@param {String} header key (case insensitive)
@param {String|RegExp} header value (optional)

Assert that a Response or Request object has a header. If a value is provided, equality to value will be asserted. You may also pass a regular expression to check.

Note: When running in a web browser, the same-origin policy only allows Chai HTTP to read certain headers, which can cause assertions to fail.

expect(req).to.have.header('x-api-key');
expect(req).to.have.header('content-type', 'text/plain');
expect(req).to.have.header('content-type', /^text/);

.headers

Assert that a Response or Request object has headers.

Note: When running in a web browser, the same-origin policy only allows Chai HTTP to read certain headers, which can cause assertions to fail.

expect(req).to.have.headers;

.ip

Assert that a string represents valid ip address.

expect('127.0.0.1').to.be.an.ip;
expect('2001:0db8:85a3:0000:0000:8a2e:0370:7334').to.be.an.ip;

.json / .text / .html

Assert that a Response or Request object has a given content-type.

expect(req).to.be.json;
expect(req).to.be.html;
expect(req).to.be.text;

.redirect

Assert that a Response object has a redirect status code.

expect(res).to.redirect;
expect(res).to.not.redirect;

.redirectTo

@param {String} location url

Assert that a Response object redirects to the supplied location.

expect(res).to.redirectTo('http://example.com');

.param

@param {String} parameter name
@param {String} parameter value

Assert that a Request object has a query string parameter with a given key, (optionally) equal to value

expect(req).to.have.param('orderby');
expect(req).to.have.param('orderby', 'date');
expect(req).to.not.have.param('limit');

.cookie

@param {String} parameter name
@param {String} parameter value

Assert that a Request or Response object has a cookie header with a given key, (optionally) equal to value

expect(req).to.have.cookie('session_id');
expect(req).to.have.cookie('session_id', '1234');
expect(req).to.not.have.cookie('PHPSESSID');
expect(res).to.have.cookie('session_id');
expect(res).to.have.cookie('session_id', '1234');
expect(res).to.not.have.cookie('PHPSESSID');

License

(The MIT License)

Copyright (c) Jake Luer jake@alogicalparadox.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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README.md

README.md

Chai HTTP

Features

Installation

Plugin

Integration Testing

Application / Server

URL

Setting up requests

Dealing with the response - traditional

Caveat

Dealing with the response - Promises

Retaining cookies with each request

Assertions

.status (code)

.header (key[, value])

.headers

.ip

.json / .text / .html

.redirect

.redirectTo

.param

.cookie

License

Files

README.md

Latest commit

History

README.md

File metadata and controls

Chai HTTP

Features

Installation

Plugin

Integration Testing

Application / Server

URL

Setting up requests

Dealing with the response - traditional

Caveat

Dealing with the response - Promises

Retaining cookies with each request

Assertions

.status (code)

.header (key[, value])

.headers

.ip

.json / .text / .html

.redirect

.redirectTo

.param

.cookie

License