Karma jasmine and an angular controller that utilizes the 'Controller as' syntax (where 'this' is used instead of $scope)

I'm having trouble setting up karma for my unit tests, specifically on a basic example:

Here is the controller file:

angular.module('balrogApp.requests', [
  /* Dependencies */
])
  // Routes configuration
  .config(['$routeProvider', function($routeProvider) {
    /* $routeProvider configuration */
  }])
  .controller('requestsController', function(Requests, Users, Projects, RequestsComments, CostEstimations,
                                             Regions, growl, $route, $rootScope, $scope, $location) {
    this.test = 'test42';

/* ... */

});

This is the test file:

describe('requestsController', function() {
  beforeEach(module('balrogApp.requests'));

  var ctrl;
  beforeEach(inject(function($controller) {
    ctrl = $controller('requestsController');
  }));

  it('should have test = "test42"', function(){
    expect(ctrl.test).toBe("test42");
  });
});

However, I encountered this error:

Chrome 43.0.2357 (Windows 7 0.0.0) requestsController should have test = "test42" FAILED Error: [$injector:unpr] Unknown provider: $scopeProvider <- $scope <- requestsController http://errors.angularjs.org/1.4.7/$injector/unpr?p0=%24scopeProvider%20%3C-%20%24scope%20%3C-%20requestsController at C:/Users/aazor102115/Desktop/Dev/Balrog/bower_components/angular/angular.js:68:12 at C:/Users/aazor102115/Desktop/Dev/Balrog/bower_components/angular/angular.js:4289:19 at Object.getService [as get] (C:/Users/aazor102115/Desktop/Dev/Balrog/bower_components/angular/angular.js:4437:39) at C:/Users/aazor102115/Desktop/Dev/Balrog/bower_components/angular/angular.js:4294:45 at getService (C:/Users/aazor102115/Desktop/Dev/Balrog/bower_components/angular/angular.js:4437:39) at invoke (C:/Users/aazor102115/Desktop/Dev/Balrog/bower_components/angular/angular.js:4469:13) at Object.instantiate (C:/Users/aazor102115/Desktop/Dev/Balrog/bower_components/angular/angular.js:4486:27) at C:/Users/aazor102115/Desktop/Dev/Balrog/bower_components/angular/angular.js:9151:28 at C:/Users/aazor102115/Desktop/Dev/Balrog/bower_components/angular-mocks/angular-mocks.js:1882:12 at Object. (C:/Users/aazor102115/Desktop/Dev/Balrog/tests/requests.js:6:12) Error: Declaration Location at window.inject.angular.mock.inject (C:/Users/aazor102115/Desktop/Dev/Balrog/bower_components/angular-mocks/angular-mocks.js:2409:25) at Suite. (C:/Users/aazor102115/Desktop/Dev/Balrog/tests/requests.js:5:14) at C:/Users/aazor102115/Desktop/Dev/Balrog/tests/requests.js:1:1 TypeError: Cannot read property 'test' of undefined at Object. (C:/Users/aazor102115/Desktop/Dev/Balrog/tests/requests.js:10:16) Chrome 43.0.2357 (Windows 7 0.0.0): Executed 1 of 1 (1 FAILED) ERROR (0.108 secs / 0.087 secs)

javascriptangularjsunit-testingdependency-injectionkarma-jasmine

Answer №1

When it comes to the $scope in your controller, it's important to remember that it is considered a "local" variable specific to the controller instance and not stored in the dependency injection container. You will need to provide it yourself, such as demonstrated below:

beforeEach(inject(function($rootScope, $controller) {
    ctrl = $controller('requestsController', { $scope: $rootScope.$new() });
}));

It's advisable to clean up after each test by destroying the scope since you are creating a new one:

var scope;

beforeEach(inject(function($rootScope, $controller) {
    scope = $rootScope.$new();
    ctrl = $controller('requestsController', { $scope: scope });
}));

afterEach(function() {
    scope.$destroy();
});

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