Managing AJAX Post Request Callbacks in Jasmine Testing Unit

I've been struggling to set up this test for quite a while now... it's really puzzling why it's not functioning properly.

Here is a snippet of my Angular app:

<body ng-app="testApp">
<div class="container" droppable>
    <div class="row"><navi></navi></div>
    <div class="row">
            <div class="col-xs-8">
                <preview></preview>
                <editor></editor>
            </div>
            <div class="col-xs-4">
                <iframe src="" pull-down></iframe>
            </div>
    </div>
</div>

This is the relevant controller code:

testApp.controller('previewController', ['$scope', '$http', function($scope, $http) {
$scope.tmp = "test";
console.log("Initializing controller");
$.ajax({
    url: "http://localhost/angularjs_testapp/request.php",
    type: "POST",
    success: function(data){
        console.log("Server response:");
        console.log(data);
        $scope.data = data;},
    error: function(data){
        console.log("An error occurred");
        console.log(data);
    }
});
}]);

And here's a sample test case:

describe('previewController', function() {
beforeEach(module('testApp'));
var scope, createController;

beforeEach(inject(function ($rootScope, $controller) {
    scope = $rootScope.$new();

    createController = $controller('previewController', {
            '$scope': scope
        });
}));

it('should have value "test":', function(done) {
    console.log(scope);
    expect(scope.tmp).toBe("test");  //passes
    expect(scope.data).toBe("hello"); //fails
});
});

The server returns the expected AJAX response when accessed directly on the website. However, during unit testing, it seems that there is an issue with communication. I attempted using promises and replacing ajax with $http.post(), but the problem persists. What could be causing this issue? Can Karma be affecting the server communication?

Answer №1

It appears that the issue you are encountering is related to trying to access the results of a $promise before it has been resolved. This requires a few modifications, such as utilizing $http. In the context of a unit test rather than an integration test, it is recommended to use $httpBackend for mocking communication without the need for an actual backend server.

To address this, you will need to make the following changes:

//adjustments in your controller
testApp.controller('previewController', ['$scope', '$http', function($scope, $http) {
     $scope.tmp = "test";
     $http.post("http://localhost/angularjs_testapp/request.php",{})
.success function(data){
    console.log("server data:");
    console.log(data);
    $scope.data = data;}).
error(function(data){
    console.log("error occured");
    console.log(data);
    })
}]);   

//modifications in your jasmine tests
describe('previewController', function() {
beforeEach(module('testApp'));
var scope, createController, httpBackend;

beforeEach(inject(function ($rootScope, $controller, $httpBackend) {
    scope = $rootScope.$new();
    httpBackend = $httpBackend;
    httpBackend.expectPOST("http://localhost/angularjs_testapp/request.php",{}).respond(200,{...Your Response...});
    createController = $controller('previewController', {
        '$scope': scope
    });

}));
afterEach(function () {
         httpBackend.verifyNoOutstandingExpectation();
         httpBackend.verifyNoOutstandingRequest();
});
it('should be "test":', function(done) {
    console.log(scope);
    expect(scope.tmp).toBe("test");  //working
    httpBackend.flush();
    expect(scope.data).toBe("hallo"); //not working
});
});

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