Delay Angular $http requests for testing

app.js

angular.module('app').config(function($httpProvider) {
  
  $httpProvider.interceptors.push(delayHttp);
  function delayHttp($timeout) {
    return {
      response: function(response) {
        return $timeout(angular.identity, Math.random() * 1000, true, response);
      }
    };
  }
});