Method check_script_error

Lib/test/test_source_encoding.py:527–541

(self, src, expected, lineno=...)

        self.assertEqual(res.out.rstrip(), expected)

    def check_script_error(self, src, expected, lineno=...):
        with tempfile.TemporaryDirectory() as tmpd:
            fn = os.path.join(tmpd, 'test.py')
            with open(fn, 'wb') as fp:
                fp.write(src)
            res = script_helper.assert_python_failure(fn)
        err = res.err.rstrip()
        self.assertRegex(err.splitlines()[-1], b'SyntaxError: ' + expected)
        if lineno is not ...:
            self.assertIn(f', line {lineno}\n'.encode(),
                          err.replace(os.linesep.encode(), b'\n'))
            line = src.splitlines()[lineno-1].decode(errors='replace')
            if lineno == 1:
                line = line.removeprefix('\ufeff')
            self.assertIn(line.encode(), err)