superagent plugin allowing to simulate HTTP calls by returning data fixtures based on the requested URL
JavaScript
Latest commit 59d648c Jan 9, 2017 @fdubost fdubost committed on GitHub v3.1.0

README.md

NPM Downloads Build Status

Installation | Usage | Supported Methods | Tests | Credits | License

superagent-mock

superagent plugin allowing to simulate HTTP calls by returning data fixtures based on the requested URL.

See this post to know why we use superagent-mock at M6Web.

Installation

Install with npm:

$ npm install superagent-mock

Usage

First, you have to define the URLs to mock in a configuration file:

// ./superagent-mock-config.js file
module.exports = [
  {
    /**
     * regular expression of URL
     */
    pattern: 'https://domain.example(.*)',

    /**
     * returns the data
     *
     * @param match array Result of the resolution of the regular expression
     * @param params object sent by 'send' function
     * @param headers object set by 'set' function
     */
    fixtures: function (match, params, headers) {
      /**
       * Returning error codes example:
       *   request.get('https://domain.example/404').end(function(err, res){
       *     console.log(err); // 404
       *     console.log(res.notFound); // true
       *   })
       */
      if (match[1] === '/404') {
        throw new Error(404);
      }

      /**
       * Checking on parameters example:
       *   request.get('https://domain.example/hero').send({superhero: "superman"}).end(function(err, res){
       *     console.log(res.body); // "Your hero: superman"
       *   })
       */

      if (match[1] === '/hero') {
        if(params['superhero']) {
          return 'Your hero:' + params['superhero'];
        } else {
          return 'You didnt chose a hero';
        }
      }


      /**
       * Checking on headers example:
       *   request.get('https://domain.example/authorized_endpoint').set({Authorization: "9382hfih1834h"}).end(function(err, res){
       *     console.log(res.body); // "Authenticated!"
       *   })
       */

      if (match[1] === '/authorized_endpoint') {
        if(headers['Authorization']) {
          return 'Authenticated!';
        } else {
          throw new Error(401); // Unauthorized
        }
      }

    },

    /**
     * returns the result of the GET request
     *
     * @param match array Result of the resolution of the regular expression
     * @param data  mixed Data returns by `fixtures` attribute
     */
    get: function (match, data) {
      return {
        body: data
      };
    },

    /**
     * returns the result of the POST request
     *
     * @param match array Result of the resolution of the regular expression
     * @param data  mixed Data returns by `fixtures` attribute
     */
    post: function (match, data) {
      return {
        code: 201
      };
    }
  },
  ...
];

Then use the plugin:

// ./server.js file
var request = require('superagent');
var config = require('./superagent-mock-config');

// Before tests
var superagentMock = require('superagent-mock')(request, config);

...

// After tests
superagentMock.unset();

Supported methods

All request methods are supported (get, put, post, etc.).

Each request method mock have to be declared in the config file. Otherwise, the callback method is used.

Logging

You can monitor each call, that has been intercepted by superagent-mock or not, by passing a callback function at initialization.

// ./server.js file
var request = require('superagent');
var config = require('./superagent-mock-config');

var logger = function(log)  {
  console.log('superagent call', log);
};

// Before tests
var superagentMock = require('superagent-mock')(request, config, logger);

...

// After tests
superagentMock.unset();

The callback function will be called with an object containing the following informations

  • data : data used with superagent.send function
  • headers : array of headers given by superagent.set function
  • matcher : regex matching the current url which is defined in the provided config
  • url : url which superagent was called
  • method : HTTP method used for the call
  • timestamp : timestamp of the superagent call
  • mocked : true if the call was mocked by superagent mock, false if it used superagent real methods

Tests

To run units tests: npm test.

To check code style: npm run lint.

Credits

Developped by the Cytron Team of M6 Web. Tested with nodeunit.

License

superagent-mock is licensed under the MIT license.