How to simulate no connection in a mocha test

I am just wondering if there is a way to simulate a "no connection" event in a mocha unit test. I have a method that return a promise that should wait for an internet connection with a polling strategy and I want to test it out with mocha. There is a method to achieve such a result.

Some code:

it('should wait for connection', function(done)
{
   this.timeout(2500);

   //simulate an internet connection drop here

   my_object.wait.connection().then(done);
   setTimeout(//activate connection, 2000);
});

Thank you for any response.