test_pydoc.py 文件源码

def test_help_output_redirect(self):
        # issue 940286, if output is set in Helper, then all output from
        # Helper.help should be redirected
        old_pattern = expected_text_pattern
        getpager_old = pydoc.getpager
        getpager_new = lambda: (lambda x: x)
        self.maxDiff = None

        buf = StringIO()
        helper = pydoc.Helper(output=buf)
        unused, doc_loc = get_pydoc_text(pydoc_mod)
        module = "test.pydoc_mod"
        help_header = """
        Help on module test.pydoc_mod in test:

        """.lstrip()
        help_header = textwrap.dedent(help_header)
        expected_help_pattern = help_header + expected_text_pattern

        pydoc.getpager = getpager_new
        try:
            with captured_output('stdout') as output, \
                 captured_output('stderr') as err:
                helper.help(module)
                result = buf.getvalue().strip()
                expected_text = expected_help_pattern % \
                                (doc_loc, inspect.getabsfile(pydoc_mod))
                self.assertEqual('', output.getvalue())
                self.assertEqual('', err.getvalue())
                self.assertEqual(expected_text, result)
        finally:
            pydoc.getpager = getpager_old