Failed test w/18.0

[ghost]

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

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I am getting the following failure when running the shipped tests in 18.0 tarball:

=================================== FAILURES ===================================
_______ TestCommandSpec.test_from_environment_with_spaces_in_executable ________

args = (<setuptools.tests.test_easy_install.TestCommandSpec object at 0x7f2f98f5e5f8>,)
keywargs = {}, extra_args = []
entered_patchers = [<unittest.mock._patch object at 0x7f2f99226978>]
exc_info = (<class 'KeyError'>, KeyError('__PYVENV_LAUNCHER__',), <traceback object at 0x7f2f98065108>)
patching = <unittest.mock._patch object at 0x7f2f99226978>
arg = 'C:\\Program Files\\Python33\\python.exe'

    @wraps(func)
    def patched(*args, **keywargs):
        extra_args = []
        entered_patchers = []

        exc_info = tuple()
        try:
            for patching in patched.patchings:
                arg = patching.__enter__()
                entered_patchers.append(patching)
                if patching.attribute_name is not None:
                    keywargs.update(arg)
                elif patching.new is DEFAULT:
                    extra_args.append(arg)

            args += tuple(extra_args)
>           return func(*args, **keywargs)

/usr/lib/python3.4/unittest/mock.py:1136:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/usr/lib/python3.4/unittest/mock.py:1549: in _inner
    return f(*args, **kw)
setuptools/tests/test_easy_install.py:494: in test_from_environment_with_spaces_in_executable
    del os.environ['__PYVENV_LAUNCHER__']
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = environ({'USERNAME': 'builduser', 'SUDO_COMMAND': '/usr/bin/makepkg -s --noconfirm -L --holdver -i', 'SUDO_GID': '0', ... 'root', 'PATH': '/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl'})
key = '__PYVENV_LAUNCHER__'

    def __delitem__(self, key):
        encodedkey = self.encodekey(key)
        self.unsetenv(encodedkey)
        try:
            del self._data[encodedkey]
        except KeyError:
            # raise KeyError with the original key value
>           raise KeyError(key) from None
E           KeyError: '__PYVENV_LAUNCHER__'

/usr/lib/python3.4/os.py:649: KeyError
========= 1 failed, 121 passed, 6 skipped, 2 xfailed in 27.53 seconds ==========

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/401

[ghost]

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

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Update changelog. Along with f44e81f2f62f, fixes #401.