Method test_placeholder

Lib/test/test_textwrap.py:530–560

(self)

                        max_lines=6)

    def test_placeholder(self):
        self.check_wrap(self.text, 12,
                        ["Hello..."],
                        max_lines=1,
                        placeholder='...')
        self.check_wrap(self.text, 12,
                        ["Hello there,",
                         "how are..."],
                        max_lines=2,
                        placeholder='...')
        # long placeholder and indentation
        with self.assertRaises(ValueError):
            wrap(self.text, 16, initial_indent='    ',
                 max_lines=1, placeholder=' [truncated]...')
        with self.assertRaises(ValueError):
            wrap(self.text, 16, subsequent_indent='    ',
                 max_lines=2, placeholder=' [truncated]...')
        self.check_wrap(self.text, 16,
                        ["    Hello there,",
                         "  [truncated]..."],
                        max_lines=2,
                        initial_indent='    ',
                        subsequent_indent='  ',
                        placeholder=' [truncated]...')
        self.check_wrap(self.text, 16,
                        ["  [truncated]..."],
                        max_lines=1,
                        initial_indent='  ',
                        subsequent_indent='    ',
                        placeholder=' [truncated]...')
        self.check_wrap(self.text, 80, [self.text], placeholder='.' * 1000)

    def test_placeholder_backtrack(self):
        # Test special case when max_lines insufficient, but what