faussaire

Faussaire

Lightweight javascript library to mock network request for testing purposes

Status

This project is still an idea and probably needs further improvements. Suggests and PR are welcome.

Installation

npm install --save-dev faussaire

Overview

Faussaire is library aiming to mock an API in tests. As said Robert C. Martin in the Ruby Midwest 2011 Conf, tests should be completely independant from your webservices, your database or whatever kind of IO device / Network implementation. Following this idea, one should be able to use a fake API with a similar behavior of any server.

Faussaire implements a simple interface allowing you to create route with URLs and method, and to put a controller to return a response object. Using the fetch() method you can easily make calls and simulate a response.

Usage Example

Basic usage

You can register a route using faussaire.Route.

import faussaire from 'faussaire';

faussaire
  .Route({
    template: "http://foo.com",
    methods: ["GET"],
    controller: {
      run: (params, options) => {
        return faussaire.Response({
          data: {
            foo: params.foo,
            bar: params.bar
          },
          status: 200,
          statusText: "OK"
        })
      }
    }
  });

const response = faussaire.fetch("http://foo.com", "GET", {foo: "bar", bar: "qux"});

Authentication

You can as well pre-authenticate the user sending a request by defining an authenticate(params, options) in the controller. It should return a token in case of success and it will be stored in the options object as options.token. If the authentication fail, there wont be any token object in options.

import faussaire from 'faussaire';

faussaire
  .Route({
    template: "http://foo.com/ressouce",
    methods: ["GET"],
    controller: {
      authenticate: function(params, options){
        if(params.apikey){
          return {
            apikey: params.apikey
            at: Date.now()
            expire: //...
          }
        }
      },
      run: (params, options) => {
        if(options.token){
          return faussaire.Response({
            status: 200,
            statusText: "OK"
          })
        }

        return faussaire.Response({
          status: 403,
          statusText: "Wrong credentials"
        })
      }
    }
  });

const response = faussaire.fetch("http://foo.com", "GET", {foo: "bar", bar: "qux"});

API

faussaire.fetch: (url, method, params) => response (Object)

The equivalent of a standard fetch.

faussaire.Route: (route) => faussaire

Adds a route to Faussaire.

faussaire.Response: (Object) => Object

Return a basic HTTP response with :

• data : the body's response
• status : the HTTP code
• statusText : the response header
• headers : a list of headers (like Location)

Usage in Production

You might want to make your own Fetch interface using Faussaire to automate switching between network fetching and local fetching. This is how it can be implemented :

import fetch from 'fetch';
import faussaire from 'faussaire';

const fetch = (url, method, params) => {
  if(process.env.NODE_ENV === "test"){
    return faussaire(url, method, params);
  }

  return fetch(url, method, params);
};

export default fetch;

Pros and Cons

Pros

• Easy to use and to mock routing & stores
• Pushes you to use proper testing habits
• Allows you to work offline

Cons

• Not implementing Promise yet
• Makes you rewrite an API, only for testing and offline development, which is a cost of time
• Young and therefore lacks possibilities

Evolutions

• Handling Promises
• Proper means to authenticate
• Handle data storage and standard functions to avoid repeating schemas (like CRUD)
• Simulate timeout if wanted (you probably don't in testing but might be useful for offline support)
• Get closer to what a network request flow should look alike (in term of headers, etc)