provider not found for underscore - angularjs

Question

i have an angularjs factory to which i am injecting underscore and application is working fine but when i try to write jasmine test cases on it i am getting an error underscore provider is not found
i have my factory like
angular.module("sample")
.factory("example", example);
example.$inject = ["$document", "$compile", "$rootScope", "$timeout", "$q", "underscore"];
function example($document, $compile, $rootScope, $timeout, $q, _) {
}
and i have my module defined as
(function(){
angular.module(samlple,[]);
})();
and my test case is as
beforeEach(module('sample'));
beforeEach(module('ionic'));
beforeEach(inject(function ($document, $compile, $rootScope, $timeout,underscore,example) {
}
its giving error
Error: [$injector:unpr] Unknown provider: underscoreProvider <- underscore

Answer 1

Add import underscore in your index.html, then add it as a service.
var underscore = angular.module('underscore', []);
underscore.factory('_', function() {
return window._; // assumes underscore has already been loaded on the page
});
And
//Now we can inject underscoreJS in the controllers
function MainCtrl($scope, _) {
//using underscoreJS method
_.max([1,2,3,4]); //It will return 4, which is the maximum value in the array
}
But I recommend you to use lodash! It has more cool functions. Information about how to use lodash with Angular you can find here .

Answer 2

Piggybacking on #Bakhtier's answer, I used the following to get Karma/Jasmine to recognize lodash so I could use it in my services, as well as the rest of my app.
angular.module('app', ['app.services', 'lodash']);
angular.module('app.services', ['lodash']).factory('MyService', ['_', function (_){
// your code bits
}]);
angular.module('lodash', []).factory('_', function() {
return window._;
});
Hope that helps someone out.