Form validation in unit test

I have following test:

beforeEach(inject(function ($rootScope, _$controller_, _$httpBackend_, Auth, $window) {
    $http = _$httpBackend_;
    $scope = $rootScope.$new();
    $controller = _$controller_;
    $authSvc = Auth;
}));

....

it('login button and form fields are empty', function () {
    $http.expectPOST('/api/users/login', controller.loginUser).respond(400, failResponse);
    controller.login();
    $http.flush();
}); 

But when I run it - I got error:

LOG: undefined
PhantomJS 1.9.8 (Mac OS X) Layout test: Login: When i click on login button and form fields are empty FAILED
    TypeError: 'undefined' is not an object (evaluating 'vm.loginForm.login')
        at /Users/nucleartux/Work/projects/ondoc-angular/app/scripts/controllers/layout.js:69

On this line in controller I have:

console.log(vm.loginForm);
vm.loginForm.login.$setValidity('wrong', false); 

How I can solve this error? How to "compile" controller include form?