Éric Araujo <mer...@netwok.org> added the comment:

Sorry, I don’t want to monkey-patch find_executable during tests.  We want the 
tests to work with the real code, with the same behavior and errors as real 
setup.py calls.  If a test does not work with python -E, then it should be 
skipped.

(Implementation idea:
  skip_if_empty_env = unittest.skipUnless(
      os.environ, 'test cannot run with an empty environment')
using sys.flags is not possible due to backward compatibility policy)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12420>
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