Jasmine unit test for angular service In controlle

Question

I'm new to jasmine framework. I've gone through some tutorials and learned and started writing unit tests. 'facing one issue here is the description. I have a controller where i can invoke a service call to get the data. See the code below.

$scope.getEmpInfo = function() {
  EmpService.getInfo($scope.empid)
     .then(function(data) {
        $scope.empData  = data;
        $scope.populateEmpData($scope.empData);
     }, function(reason) {
        //do nothing
    } 
}

Now, i want to write a unit test for the above method. Im able to make a spy on serice using promise but i wasnt able to spy $scope.populateEmpData(). here is my test case.

    describe('Emp data', function() {
       var d, scope;
       beforeEach(function() {
          module("emp");
          module("emo.info");
       });
       describe('empcontroller', function() {
          beforeEach(inject(function($q,_EmpService_, $controller,$rootScope){
              d = $q.defer();
              empService = _EmpService_;
              spyOn(empService,"getInfo").and.returnValue(d.promise);
              scope = $rootScope.$new();
              empCtrl = $controller("empController", {
                $scope: scope,
              });
           }));
         it('should get the Employee information ', function() {
                scope.getEmpInfo();
                spyOn(scope,'populateEmpData');
                expect(EmpService.getInfo).toHaveBeenCalled();
                //Here im getting the error.
                expect(scope.populateEmpData).toHaveBeenCalled();
         });

       });
   });

Please help resolve this issue. Thanks in advance.

Answer 1

It's because you are not resolving promise. You will have to make change in spyOn.

 - spyOn(empService,"getInfo").and.callFake(function() {
            return {
                  then : function(success, error) {
                     success();
                }  
         } }

Now, it will go into the success callback and will try to call $scope.populateEmpData();

Answer 2

You're never resolving your promise. And you need to call $scope.$apply().

Why is this necessary? Because any promises made with the $q service to be resolved/rejected are processed upon each run of angular’s digest cycle. Conceptually, the call to .resolve changes the state of the promise and adds it to a queue. Each time angular’s digest cycle runs, any outstanding promises will be processed and removed from the queue. Unit Testing with $q Promises in AngularJS

Check it out above link it will help you.