How to filter requests in Sinon

Question

I am writing unit tests in Jasmine for Backbone application. And of course I use Sinon in my tests. But now I have problem. I am writing tests for Login screen and I need simulate server responce - because server works very bad. Now my code looks:

describe('Login', function(){
     it('Should simulate server response', function(){
        server = sinon.fakeServer.create();
        server.respondWith("GET", "http:\\example.com", [200, {"Content-Type": "application/json"}, '{"Body:""asd"}'])
     })
     $('body').find('button#login').trigger('click');
     server.respond();
     server.restore()
     console.log(server.requests);
})

And this code works fine, but I see in console that fakes all requests, but during Login I also have other requests, and I don't need use fake server for them. It is requests for next screen. Maybe exist way to make filter or use fake responds for special requests. Help me please. Thanks.

Answer 1

The trick is to use filters on the FakeXMLHttpRequest object of the server. Then only the request you filter out will use the fake server:

server = sinon.fakeServer.create();
server.xhr.useFilters = true;

server.xhr.addFilter(function(method, url) {
  //whenever the this returns true the request will not faked
  return !url.match(/example.com/);
});

server.respondWith("GET", "http:\\example.com", [200, {"Content-Type": "application/json"}, '{"Body:""asd"}'])