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Steps to reproduce the problem.
1. Create a module (ex. name it "test") 
2. Create a file in it (ex. mainTest.py) with a class (ex. MainTest) derived from TestCase.
3. Create a test method in that class, (ex. test_base), prefix it with "test".
4. Create a decorator (ex. clear_args) and use it on the test method 
5. Create a test suite with the function "loadTestsFromName" of TestLoader class and make a TestRunner run it (I use a TextTestRunner). 
suite = unittest.TestLoader().loadTestsFromName('test.mainTest.MainTest.test_base')
unittest.TextTestRunner(verbosity=2).run(suite)
It is expected that the test is run (it runs without decorator).
It gives an error: no such test method in <class 'test.mainTest.MainTest'>: wrapper.
"wrapper" is the name of the returned function in the decorator.
I'm using Python 2.7.3 on Windows 7 64bit.
I search "loadTestsFromName decorator" without results, so I decided to report as new issue. This is my first report, I admit I've not read any guide/instructions.

I don't think this is documented anywhere (and should be). I believe what you need to do is use functools.wraps on your wrapper function.

Whilst functools.wraps would fix the problem it still sounds like a bug (or at the very least a reasonable feature request).

Here's a patch.

Patch looks great - thanks David.

New changeset b17bcfadd7f3 by R David Murray in branch '3.3':
#14971: Use class method name, not function.__name__, during unittest discovery.
http://hg.python.org/cpython/rev/b17bcfadd7f3
New changeset 659c89275be2 by R David Murray in branch 'default':
Merge #14971: Use class method name, not function.__name__, during unittest discovery.
http://hg.python.org/cpython/rev/659c89275be2 

Fixed in Python3.
The 2.7 unittest code is different enough that it is not immediately obvious how to make the equivalent fix (given that it has been a while since I looked at this logic). If someone wants to work out the equivalent 2.7 patch, I will apply it.

The patch for Python 2.7 is pretty similar with the one provided for Python 3.

Cool, thanks!

New changeset 78a5de507f19 by Michael Foord in branch '2.7':
Closes issue 14971.
http://hg.python.org/cpython/rev/78a5de507f19