I am new in this forum (and in JUNIT), even as I have work several years in software testing. -> hello :-)

What I want to do: I want to write a JUNIT test, which clicks on my button (like I would write any other GUI test in capture replay style), but I am lost. Google told my a lot of good stuff, like using SWTBot or Abbot, but I realy want to try just write a junit test. (and I could not get SWTBot to work ... did I mentioned I am new in Java world??)
In my application I have a button: bn0, which has an eventhandler associted when clicked on the button:
new ActionListener()
public void actionPerformed(ActionEvent e){

Getting the button with getBn0() in my test class is working .... Could someone advice my how I can send the event to the button?

Hopefully my question is understandable (and not stupid - I am aware, that this is not a good test, but for my real testing, I would need to solve this problem first)