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To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Is it possible to make a unittest decorator to rename a method from "x" to "testx?"
Date: Thu, 08 Aug 2013 04:04:30 -0400
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On 8/8/2013 2:32 AM, adam.preble@gmail.com wrote:
> We were coming into Python's unittest module from backgrounds in nunit, where they use a decorate to identify tests.  So I was hoping to avoid the convention of prepending "test" to the TestClass methods that are to be actually run.  I'm sure this comes up all the time, but I mean not to have to do:
>
> class Test(unittest.TestCase):
>      def testBlablabla(self):
>          self.assertEqual(True, True)
>
> But instead:
> class Test(unittest.TestCase):
>      @test
>      def Blablabla(self):
>          self.assertEqual(True, True)

I cannot help but note that this is *more* typing. But anyhow, something 
like this might work.

def test(f):
     f.__class__.__dict__['test_'+f.__name__]

might work. Or maybe for the body just
    setattr(f.__class__, 'test_'+f.__name__)


> Superficially, you'd think changing a function's __name__ should do the trick, but it looks like test discovery happens without looking at the transformed function.

I am guessing that unittest discovery for each class is something like

if isinstance (cls, unittest.TestCase):
   for name, f in cls.__dict__.items():
     if name.startswith('test'):
       yield f

You were thinking it would be
...
   for f in cls.__dict__.values():
     if f.__name__.startwith('test'):
       yield f

Not ridiculous, but you seem to have disproven it. I believe you can 
take 'name' in the docs to be bound or namespace name rather than 
definition or attribute name.

-- 
Terry Jan Reedy