'Test isolation from system site-packages'

def test_isolation(self):

    for (ssp, s) in ((True, 'true'), (False, 'false')):
        builder = venv.EnvBuilder(clear=True, system_site_packages=ssp)
        builder.create(self.env_dir)
        data = self.get_text_file_contents('pyvenv.cfg')
        self.assertIn(('include-system-site-packages    =    %s\n' % s), data)
