sinon example

gistfile1.js

describe('fxpay', function () {
  describe('API', function() {
    var api;
    var server;

    beforeEach(function() {
      api = new fxpay.API();
      server = sinon.fakeServer.create();
    });

    afterEach(function() {
      server.restore();
    });

    it('should report 500 responses', function(done) {
      server.respondWith(
        'GET', '/error',
        [500, {"Content-Type": "application/json"},
         JSON.stringify({result: 'error'})]);

      api.get('/error', function(error) {
        assert.equal(error, 'BAD_API_RESPONSE');
        done();
      });

      // Respond to the asynchronous request now:
      server.respond();
    });
  });
});