test_shutil.py 文件源码

def test_w_source_open_fails(self):
        def _open(filename, mode='r'):
            if filename == 'srcfile':
                raise IOError('Cannot open "srcfile"')
            assert 0  # shouldn't reach here.

        self._set_shutil_open(_open)

        self.assertRaises(IOError, shutil.copyfile, 'srcfile', 'destfile')