angular $q is not working in test env

index.spec.js

var inject = angular.mock.inject;
var $q;

describe('$q is really strange', function (){
    beforeEach(inject(function ($injector){
        $q = $injector.get('$q');
    }));

    it('should proof that q is working properly', function (done){
        var lastRequest = $q.defer();
        setTimeout(function (){
            lastRequest.resolve('my-value');
        }, 300);

        lastRequest.promise
        .then(iAmDone);

        function iAmDone(val) {
            console.log('======================resolved val======================');
            console.log(val);
            done();
        }
    });
});