Method test_w_source_open_fails

Lib/test/test_shutil.py:3025–3033

(self)

            return self._suppress_at_exit

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

        with support.swap_attr(shutil, 'open', _open):
            with self.assertRaises(OSError):
                shutil.copyfile('srcfile', 'destfile')

    @unittest.skipIf(MACOS, "skipped on macOS")
    def test_w_dest_open_fails(self):