in angular js while testing the controller got Unknown provider - unit-testing

Question

I have the following controller:
angular.module('samples.controllers',[])
.controller('MainCtrl', ['$scope', 'Samples', function($scope, Samples){
//Controller code
}
Which dependent on the following service:
angular.module('samples.services', []).
factory('Samples', function($http){
// Service code
}
Tried to test the controller using the following code:
describe('Main Controller', function() {
var service, controller, $httpBackend;
beforeEach(module('samples.controllers'));
beforeEach(module('samples.services'));
beforeEach(inject(function(MainCtrl, Samples, _$httpBackend_) {
}));
it('Should fight evil', function() {
});
});
But got the following error:
Error: Unknown provider: MainCtrlProvider <- MainCtrl.
P.s Tried the following post, didn't seem to help

Answer 1

The correct way to test controllers is to use $controller as such:
ctrl = $controller('MainCtrl', {$scope: scope, Samples: service});
Detailed example:
describe('Main Controller', function() {
var ctrl, scope, service;
beforeEach(module('samples'));
beforeEach(inject(function($controller, $rootScope, Samples) {
scope = $rootScope.$new();
service = Samples;
//Create the controller with the new scope
ctrl = $controller('MainCtrl', {
$scope: scope,
Samples: service
});
}));
it('Should call get samples on initialization', function() {
});
});