Leverage $httpBackend to simulate $http requests and modify the anticipated URL within Angular framework

My current task involves testing a service that utilizes $http

 var APIClient = function($http) {
     this.send = function(data) {
         $http({
             method: data.method,
             url: data.url,
             headers: data.headers,
             data: data.data
         }).success(function(response, status) {
             data.success(response, status);
         }).error(function(response, status) {
             data.error(response, status);
         });
     }
 }

 angular.module('api.client', []).factory('APIClient', ['$http'
     function($http) {
         var client = new APIClient($http);

         return {
             send: function(data) {
                 return client.send(data);
             },
         }

     }
 ]);

As part of the testing process, I have constructed the following test scenario:

  describe('send', function() {

      var apiClient, $httpBackend;

      beforeEach(module('compare'));

      beforeEach(inject(function($injector) {
          $httpBackend = $injector.get('$httpBackend');
          apiClient = $injector.get('APIClient');
      }));

      it('The existence of send() function should be verified', function() {
          expect(apiClient.send).toBeDefined();
      });

      it('A GET request should be sent successfully', function(done) {
          var url = '/';

          $httpBackend.expect('GET', url).respond({});

          apiClient.send({
              url: url,
              success: function(data, status) {
                  console.log(status);
                  done();
              },
              error: function(data, status) {
                  console.log(status);
                  done();
              }
          });

          $httpBackend.flush();
      });
  });

However, during testing, an unexpected error keeps occurring:

PhantomJS 1.9.8 (Mac OS X) send Should send GET request FAILED
        Error: Unexpected request: GET templates/test.html
        Expected GET /

The issue seems to stem from the fact that the URL being tested keeps changing to 'templates/test.html' instead of staying at '/' which was provided in my code snippet in app.js.

Answer №1

The primary issue lies in the following line:

beforeEach(module('compare'));

Instead of just loading the apiClient, you are inadvertently loading your entire app. This results in a comprehensive integration test rather than a focused unit test.

To rectify this, only load api.client.

beforeEach(module('api.client'));

Additionally, you can use:

$httpBackend.whenGET(/templates\/(.*)/).respond('');
to disregard all templates loaded by routers, controllers, or directives. However, this still strays from being a pure unit test as it extends beyond testing solely your APIClient.

Another crucial point to consider:

Avoid using anonymous functions within .run or .config to facilitate mocking capabilities. For example:

.config(CompareStateLoader);

CompareStateLoader.$inject = [
    '$stateProvider', 
    '$urlRouterProvider'
];

function CompareStateLoader(
    $stateProvider, 
    $urlRouterProvider
){
    //configure states here 
}

This approach enables you to mock CompareStateLoader and seamlessly incorporate it into your test runner.

For further insights, refer to John Papa's Angular Style Guide here.

Answer №2

To streamline your workflow, consider consolidating all your templates into a JS file using tools like the grunt "html2js" task or the karma preprocessor "ng-html2js". This will save you the trouble of dealing with template fetching.

You could also opt for using passThrough

$httpBackend.when('GET', /\.html$/).passThrough()

Check out this example - http://plnkr.co/edit/pbjcDl?p=preview

Though both options are viable, I recommend going with the first one.

Answer №3

let clientAPI, $httpBackend, $location;

    beforeEach(module('compare'));

    beforeEach(inject(function($injector, $loc) {
        $httpBackend = $injector.get('$httpBackend');
        clientAPI = $injector.get('APIClient');
        $location = $loc;
    }));


it ('Expecting GET request to be sent', function(done) {
        expect($location.path()).toEqual('');
        let url = '/';

        $httpBackend.expect('GET', $location.path('/')).respond({});

        clientAPI.send({
            url: url,
            success: function(data, status) {
                console.log(status);
                done();
            },
            error: function(data, status) {
                console.log(status);
                done();
            }
        });

        $httpBackend.flush();
    });

Note: Make sure to incorporate angular-mock for utilizing $location effectively

beforeEach(inject(function(_$httpBackend_, APIClient) {
        $httpBackend = _$httpBackend_;
        clientAPI = APIClient;
    }));

Answer №4

Include the following code in your before each statement - $httpBackend.expect('GET', "templates/test.html").respond(200);

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