[Zope] Running Tests on my Zope Product in Zope 2.13

[Sascha Welter]

Hello again Zopistas!

While I am on the topic of Zope 2.13, could someone please tell me how I
can run my tests on my (old style, not egg) Zope Products in Zope 2.13?

It seems that `zopectl test` went away without leaving more than a note
on the tab^W^W^Win the CHANGES.txt log:
"Removed the test command from zopectl. The test.py script it was
relying on does no longer exist."

So, how do I run my tests now?

Thanks for any hints!

Regards,

Sascha