Getting error while using Jasmine with AngularJS

I am using jasmin to test my AngularJs project with following code

controllersSpec.js

describe('myApp', function(){

    beforeEach(angular.mock.module('myApp'));

    it('should have a mailctrl', function() {
        expect(myApp.mailctrl).toBeDefined();
    });
});

controller.js

var myApp = angular.module('myApp', []);

myApp.controller('mailctrl', ['$scope', '$routeParams', '$rootScope', 'getMailData', '$angularCacheFactory',

    function ($scope, $routeParams, $rootScope, getMailData, $angularCacheFactory) {
           ##....controller content....##
    }
]);

SpecRunner.html

Now when I am opening Specrunner.html in browser, I am getting following error

Expected undefined to be defined.
I have following question regarding above

1) Where I am getting wrong ?
2) How can I use $rootScope variable of controller ?
3) Whats the difference in beforeEach(angular.mock.module('myApp')); and beforeEach(angular.module('myApp')); and beforeEach(module('myApp'));

EDIT :

I have modified the code as

describe('myApp', function(){
    beforeEach(angular.mock.module('myApp'));        
    it('should have a mailctrl', inject(function($rootScope, $controller) {
        var controller = $controller('mailctrl', { $scope: $rootScope.$new(), $rootScope: $rootScope });
        expect(controller).toBeDefined();
}));

and getting following error -

Error: [$injector:unpr] http://errors.angularjs.org/undefined/$injector/unpr?p0=%24routeParamsProvider%20%3C-%20%24routeParams

If I add other params in $controller() (i.e. '$routeParams', 'getMailData') Error comes as they are undefined.

idursun

1) You are making a mistake by trying to access your controller as a field on a module. in your test you should be injecting $controller into your test to create your controller. What that means is that you should be writing your tests like the following:

it('should have a mailctrl', inject(function($rootScope, $controller) {
   var controller = $controller('mainctrl', { $scope: $rootScope.$new(), $rootScope: $rootScope, ...  }) // rest of your dependencies
   expect(controller).toBeDefined();
}));

2) See 1

3) angular.mock.module is used to register your module to the injector in your tests. It is the same thing as module. angular.module is used to create, register or retrieve a module for your application.

Regarding your edit:

You are not providing routeParams and any other service that your controller depends on so $injector does not know where to get them from and is throwing this error. $injector has to know what to inject for every parameter that is required by your controller. Your controller depends on

$rootScope: provided by angular
$scope: can be created by $rootScope.$new()
getMailData: This is your service, you have to provide a mock for this
$routeParams: This is angular built-in structure but there is not a dedicated mock, but since it is a very simple object you can provide a mock for this yourself.
$angularCacheFactory: this is a third party service and you have to provide a mock for this as well

So in the end you should be creating your controller like this:

it('should have a mailctrl', inject(function($rootScope, $controller) {
   var controller = $controller('mainctrl', { 
         $scope: $rootScope.$new(), 
         '$routeParams': {}, // whatever  it needs to be to be able to test your controller
         $rootScope: $rootScope, 
         'getMailData': getMailDataMOCK // this object is created by you in your test code
         '$angularCacheFactory': $angularCacheFactoryMOCK
       }) 
   expect(controller).toBeDefined();
}));

If you don't provide any of these arguments then it will try to get it from $injector and will throw an exception when not found.

来源：https://stackoverflow.com/questions/21252369/getting-error-while-using-jasmine-with-angularjs

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angularjs

jasmine