Test failure on OS X framework build

[bb-migration]

Originally reported by: jaraco (Bitbucket: jaraco, GitHub: jaraco)

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Currently, a test fails on OS X under Python 3.4 framework build due to the setting of __PYVENV_LAUNCHER__:

$ python setup.py test --addopts='-k environment_with_spaces'
...
====================================== test session starts =======================================
platform darwin -- Python 3.4.3 -- py-1.4.28 -- pytest-2.6.4
collected 128 items / 2 skipped 

setuptools/tests/test_easy_install.py F
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> traceback >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

self = <setuptools.tests.test_easy_install.TestCommandSpec object at 0x1048f3e80>

    def test_from_environment_with_spaces_in_executable(self):
        with mock.patch('sys.executable', TestScriptHeader.exe_with_spaces):
            cmd = ei.CommandSpec.from_environment()
        assert len(cmd) == 1
>       assert cmd.as_header().startswith('#!"')
E       assert <built-in method startswith of str object at 0x1048f74e0>('#!"')
E        +  where <built-in method startswith of str object at 0x1048f74e0> = '#!/Library/Frameworks/Python.framework/Versions/3.4/bin/python3\n'.startswith
E        +    where '#!/Library/Frameworks/Python.framework/Versions/3.4/bin/python3\n' = <bound method CommandSpec.as_header of ['/Library/Frameworks/Python.framework/Versions/3.4/bin/python3']>()
E        +      where <bound method CommandSpec.as_header of ['/Library/Frameworks/Python.framework/Versions/3.4/bin/python3']> = ['/Library/Frameworks/Python.framework/Versions/3.4/bin/python3'].as_header

setuptools/tests/test_easy_install.py:495: AssertionError

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/396

[bb-migration]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Fix test failure when PYVENV_LAUNCHER is set. Fixes #396.