Ember integration testing and keyboard shortcuts

I'm having issues testing the following behavior with an integration test:

When a checkbox is focused, and I press the space bar, the checkbox gets checked.

If I override the keyDown event in my component I can catch the event, but it doesn't seem to fall down to the normal behavior and doesn't check the checkbox. However, when I manually test it, it works like a charm.

For the event, I'm using this:

this.$(':checkbox:eq(0)').trigger(jQuery.Event( 'keydown', { keyCode: 32 } ))

Thank you very much for your help!