Unit testing a directive that calls a service

0
votes

I have a service that looks at the current URL and retrieves a querystring parameter:

app.service('myService', function($location) {
    return {
        getCustID : function() {
            return $location.search().custID;
        }
    };
});

And I have been able to successfully unit test via:

describe('myService', function(){

    var $location, myService;

    beforeEach(module('myApp'));

    beforeEach(inject(function (_myService_, _$location_) {
        this.myService = _myService_;
        $location = _$location_;
    }));

    it('should get a promoCode from the url', function(){
        $location.url('/?custID=DSGAG444355');
        expect(this.myService.getCustID()).toEqual('DSGAG444355');
    });
});

However, I have a directive which uses the service above. How can I test that?

Directive:

app.directive('imageDirective', function($compile, myService) {
    return {
        restrict: 'A',
        replace: true,
        scope: true,
        link: function (scope, element, attrs) {

            var custID = myService.getCustID();
            var myText;

            if (custID == 3) {
                text = 'cust ID is 3';
            }

            var jqLiteWrappedElement = angular.element('<img src="/resources/img/welcome.png' alt=" ' + myText + '" />');
            element.replaceWith(jqLiteWrappedElement);
            $compile(jqLiteWrappedElement)(scope);
        }
    };
});

UPDATE:

Here's a test i attempted based on the intial repsonse below:

describe('my directive test', function () { var $scope, compile, element, myMock;

beforeEach(module('myApp'));

beforeEach(module(function($provide){
    myMock = {}//Mock the service using jasmine.spyObj, or however you want
    $provide.factory('myService', function(){
        return myMock;
    })
}));    

beforeEach(inject(function ($rootScope, $compile) {
    $scope = $rootScope.$new();
    element = angular.element("<img my-directive/>");
    $compile(element)($scope);
    $scope.$digest();
}));


it('should get a parameter from the URL', function(){
    $location.url('/?custID=003');
    expect(myMock.getcustID()).toEqual('003');
});

});

TypeError: myService.getCustID is not a function
2
javascriptangularjsjasminekarma-jasmineangular-directive

2 Answers

0
votes

You can mock the service using $provide

var myMock;
beforeEach(module('myApp'));
beforeEach(module(function($provide){
  myMock = {}//Mock the service using jasmine.spyObj, or however you want
  $provide.factory('myService', function(){
    return myMock;
  })
}));

and then follow the instructions on angular's documentation on how to unit test directives.

0
votes

Use Jasmine mocks for unit testing. Once the library is downloaded:

describe('mydirective', function(){

var $location, myService;

beforeEach(module('myApp'));

beforeEach(inject(function (_myService_, _$location_) {
    myService = _myService_;
    $location = _$location_;
  spyOn(myService, "getCustID").and.returnValue("123462");
}));
//Write stuff for your directive here
it('should have made a call to ', function(){
    expect(myService.getCustId).toHaveBeenCalled()
});

for more reference :http://volaresystems.com/blog/post/2014/12/10/Mocking-calls-with-Jasmine