EXEC: Open JBossCentral, exapnd Project Examples
EXEC: Select booking example
Dialog says, you need to have TestNG installed.
EXEC: click 'Install'
ASSERT: TestNG gets installed or you get a message when it could not be installed.

Would it be possible for 'Install' button to know, that TestNG needs to be installed from specific updatesite? It could then check and possibly add it and succeed installation.