mock jquery

gistfile1.js

function ajaxSuccess(execution) {
  var original_ajax = $j.ajax
  $j.ajax = function(options) {
    var response = JSON.parse( ajaxFixtures[options.url] || '{}' );
    options['success'].call(this, response) 
  };
  execution.call(this);
  console.log('pong');
  $j.ajax = original_ajax;
}