In the run_tests.py script it appears that unittestgui
has changed slightly with new releases.

The line 

unittestgui.main(suites, minimal)

apparently needs to be changed to

unittestgui.main(suites)

for unittestgui 1.7

I didn't check in this change since I am new to
unittestgui and may be using the wrong version.

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Hurm. It's really quite b0rken, even when that fix is made. I 
might need to update to a more recent version of 
run_tests.py from Zope :) 

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Nope, looks like Zope3's test runner hasn't upgraded to the 
latest unittestgui API either. 
 
Won't upgrade to their code as it's python2.3-specific. 
 
Feel free to close this issue if it's not particularly important to 
you. I personally don't care about the gui runner. 

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Hrm. Just noticed you say "unittestgui 1.7" whereas I just 
downloaded the latest from the pyunit website, and it's 1.4.1 
... 
 

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Hmm, this page http://pyunit.sourceforge.net/unittestgui.html
says it is 1.7 but I think you are right in that I'm
actually using 1.4.1.

The change that I made works for me, so why don't I just
check it in anyway, otherwise we should just remove the -m
flag from run_tests.py

I don't particularly care either way, but it was kind of
cute to see the progress bar indicate 0 errors with the
metakit backend ;)

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Go ahead and check in the change :)