[news.eclipse.platform] Access to MessageDialog object

[nadavsteindler@xxxxxxxxx (Nadav)]

I want to write a test in JUnit to see that an Error Dialog pops up with 
the correct message.

How, in my unit test, do I get at the MessageDialog object my that my 
program creates?

I assume I need to do 
PlatformUI.getWorkbench().getDisplay().getActiveShell() or 
PlatformUI.getWorkbench().getDisplay().getActiveShell().getChildren(), but 
from there I'm lost...