AngularJS - Unit Test with $timeout

I have a directive that look like this:

angular.directive('myDirective', ['$compile','$timeout', function($compile,$timeout){
    console.log("myDirective compile");
    return {
        link: function(scope, element) {
            console.log("myDirective before timeout");
            $timeout(function(){
                console.log("myDirective after timeout");
            });
        }
    };
}]);

When I do unit test with Karma-Jasmine, I get the LOG output of myDirective compile and myDirective before timeout. But no output for myDirective after timeout

How can I get the $timeout function to run in unit test?