javascript - Injected $stateParams and $state into jasmine angular js test getting undefined

Question

I am writing a jasmine test for my DetailCtrl. I have 10 json file each with file names like this

1.json
2.json
3.json

in my data folder

Here is my Detail Ctrl

backpagecontrollers.controller('DetailCtrl', function($scope, $stateParams, $http) {
  $http.get('data/' +  $stateParams.listingId + '.json').success(function(data) {
      $scope.extrainfo = data; 
  });
}); 

The detail controller is fetching each 1.json, 2.json, 3.json file from my data folder.

Here is a part of my route

.state('listingdetail', {
      url: "/listings/:listingId",
      templateUrl: "partials/detail.html",
      controller: 'DetailCtrl'
    })

Lets head back to the test, I injected both the $stateParams and the $state into the test.

I want to test that for each json file above the images exist inside my json file. I am setting the httpbackend to get the local host url plus the listingId from the $stateparams which I configured as part of the routes but the listingId is coming back as undefined. Am I suppose to inject something else into my test?

describe('Detail Ctrl', function() {

      var scope, ctrl, httpBackend, stateparams, listingId; 

      beforeEach(angular.mock.module("backpageApp"));
      beforeEach(angular.mock.inject(function($controller, $rootScope, _$httpBackend_,    $stateParams, $state) {
        httpBackend = _$httpBackend_;
        stateparams = $stateParams; 
        listingId = stateparams.listingId;

        httpBackend.expectGET('http://localhost:8000/#/listings/' + listingId).respond([{id: 1 }, {id: 2}, {id:3}, {id:4}, {id:5}, {id:6}, {id:7}, {id:8}, {id:9}, {id:10}]);
        scope = $rootScope.$new(); 
        ctrl = $controller("DetailCtrl", {$scope:scope}); 
      }));

       it('the images for each listing should exist', function() {
        httpBackend.flush(); 
        expect(scope.images).toBe(true)
      });
    });

I am getting this error

Error: Unexpected request: GET data/undefined.json
    Expected GET http://localhost:8000/#/listings/undefined

Answer 1

I think you might be misunderstanding how the router is working with the controller. When you're unit testing a controller, you're not executing a route or entering a ui-router state. Those states and routes are what trigger controllers to be executed when the application is running normally. But in a unit test, you're executing the controller explicitly using $controller. So you're skipping the routing part altogether. Which means you need to mock the object that the ui-router would normally create for you, $stateparams.

describe('Detail Ctrl', function() {

  var scope, ctrl, httpBackend, stateparams, listingId; 

  beforeEach(angular.mock.module("backpageApp"));
  //don't need to inject state or stateparams here
  beforeEach(angular.mock.inject(function($controller, $rootScope, _$httpBackend_) {
    httpBackend = _$httpBackend_;
    stateparams = { listingId: 1 }; //mock your stateparams object with your id

    //you should be expecting the get request url from the controller, not the route
    httpBackend.expectGET('data/' + stateparams.listingId + '.json').respond([{id: 1 }, {id: 2}, {id:3}, {id:4}, {id:5}, {id:6}, {id:7}, {id:8}, {id:9}, {id:10}]);
    scope = $rootScope.$new(); 
    //pass your mock stateparams object to the controller 
    ctrl = $controller("DetailCtrl", {$scope:scope, $stateParams:stateparams}); 
  }));

   it('the images for each listing should exist', function() {
    httpBackend.flush(); 
    //I don't see images set in your controller, but you 
    //could check scope.extrainfo here
    expect(scope.images).toBe(true)
  });
});