# Test issue #20654 to ensure enum member with value 0 can be
        # displayed. It used to throw KeyError: 'zero'.
        import enum
        class BinaryInteger(enum.IntEnum):
            zero = 0
            one = 1
        doc = pydoc.render_doc(BinaryInteger)
        self.assertIn('<BinaryInteger.zero: 0>', doc)

    def test_issue8225(self):
        # Test issue8225 to ensure no doc link appears for xml.etree
        result, doc_loc = get_pydoc_text(xml.etree)
        self.assertEqual(doc_loc, "", "MODULE DOCS incorrectly includes a link")

    def test_getpager_with_stdin_none(self):
        previous_stdin = sys.stdin
        try:
            sys.stdin = None
            pydoc.getpager() # Shouldn't fail.
        finally:
            sys.stdin = previous_stdin

    def test_non_str_name(self):
        # issue14638
        # Treat illegal (non-str) name like no name
        class A:
            __name__ = 42
        class B:
            pass
        adoc = pydoc.render_doc(A())
        bdoc = pydoc.render_doc(B())
        self.assertEqual(adoc.replace("A", "B"), bdoc)

    def test_not_here(self):
        missing_module = "test.i_am_not_here"
        result = str(run_pydoc(missing_module), 'ascii')
        expected = missing_pattern % missing_module
        self.assertEqual(expected, result,
            "documentation for missing module found")

    @unittest.skipIf(sys.flags.optimize >= 2,
                     'Docstrings are omitted with -OO and above')
    def test_not_ascii(self):
        result = run_pydoc('test.test_pydoc.nonascii', PYTHONIOENCODING='ascii')
        encoded = nonascii.__doc__.encode('ascii', 'backslashreplace')
        self.assertIn(encoded, result)

    def test_input_strip(self):
        missing_module = " test.i_am_not_here "
        result = str(run_pydoc(missing_module), 'ascii')
        expected = missing_pattern % missing_module.strip()
        self.assertEqual(expected, result)

    def test_stripid(self):
        # test with strings, other implementations might have different repr()
        stripid = pydoc.stripid
        # strip the id
        self.assertEqual(stripid('<function stripid at 0x88dcee4>'),
                         '<function stripid>')
        self.assertEqual(stripid('<function stripid at 0x01F65390>'),
                         '<function stripid>')
        # nothing to strip, return the same text
        self.assertEqual(stripid('42'), '42')
        self.assertEqual(stripid("<type 'exceptions.Exception'>"),
                         "<type 'exceptions.Exception'>")

    @unittest.skipIf(sys.flags.optimize >= 2,
                     'Docstrings are omitted with -O2 and above')
    @unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
                     'trace function introduces __locals__ unexpectedly')
    @requires_docstrings
    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,) +
                                expected_text_data_docstrings +
                                (inspect.getabsfile(pydoc_mod),))
                self.assertEqual('', output.getvalue())
                self.assertEqual('', err.getvalue())
                self.assertEqual(expected_text, result)
        finally:
            pydoc.getpager = getpager_old

    def test_namedtuple_public_underscore(self):
        NT = namedtuple('NT', ['abc', 'def'], rename=True)
        with captured_stdout() as help_io:
            pydoc.help(NT)
        helptext = help_io.getvalue()
        self.assertIn('_1', helptext)
        self.assertIn('_replace', helptext)
        self.assertIn('_asdict', helptext)

    def test_synopsis(self):
        self.addCleanup(unlink, TESTFN)
        for encoding in ('ISO-8859-1', 'UTF-8'):
            with open(TESTFN, 'w', encoding=encoding) as script:
                if encoding != 'UTF-8':
                    print('#coding: {}'.format(encoding), file=script)
                print('"""line 1: h\xe9', file=script)
                print('line 2: hi"""', file=script)
            synopsis = pydoc.synopsis(TESTFN, {})
            self.assertEqual(synopsis, 'line 1: h\xe9')

    @unittest.skipIf(sys.flags.optimize >= 2,
                     'Docstrings are omitted with -OO and above')
    def test_synopsis_sourceless(self):
        expected = os.__doc__.splitlines()[0]
        filename = os.__cached__
        synopsis = pydoc.synopsis(filename)

        self.assertEqual(synopsis, expected)

    def test_synopsis_sourceless_empty_doc(self):
        with test.support.temp_cwd() as test_dir:
            init_path = os.path.join(test_dir, 'foomod42.py')
            cached_path = importlib.util.cache_from_source(init_path)
            with open(init_path, 'w') as fobj:
                fobj.write("foo = 1")
            py_compile.compile(init_path)
            synopsis = pydoc.synopsis(init_path, {})
            self.assertIsNone(synopsis)
            synopsis_cached = pydoc.synopsis(cached_path, {})
            self.assertIsNone(synopsis_cached)

    def test_splitdoc_with_description(self):
        example_string = "I Am A Doc\n\n\nHere is my description"
        self.assertEqual(pydoc.splitdoc(example_string),
                         ('I Am A Doc', '\nHere is my description'))

    def test_is_object_or_method(self):
        doc = pydoc.Doc()
        # Bound Method
        self.assertTrue(pydoc._is_some_method(doc.fail))
        # Method Descriptor
        self.assertTrue(pydoc._is_some_method(int.__add__))
        # String
        self.assertFalse(pydoc._is_some_method("I am not a method"))

    def test_is_package_when_not_package(self):
        with test.support.temp_cwd() as test_dir:
            self.assertFalse(pydoc.ispackage(test_dir))

    def test_is_package_when_is_package(self):
        with test.support.temp_cwd() as test_dir:
            init_path = os.path.join(test_dir, '__init__.py')
            open(init_path, 'w').close()
            self.assertTrue(pydoc.ispackage(test_dir))
            os.remove(init_path)

    def test_allmethods(self):
        # issue 17476: allmethods was no longer returning unbound methods.
        # This test is a bit fragile in the face of changes to object and type,
        # but I can't think of a better way to do it without duplicating the
        # logic of the function under test.

        class TestClass(object):
            def method_returning_true(self):
                return True

        # What we expect to get back: everything on object...
        expected = dict(vars(object))
        # ...plus our unbound method...
        expected['method_returning_true'] = TestClass.method_returning_true
        # ...but not the non-methods on object.
        del expected['__doc__']
        del expected['__class__']
        # inspect resolves descriptors on type into methods, but vars doesn't,
        # so we need to update __subclasshook__.
        expected['__subclasshook__'] = TestClass.__subclasshook__

        methods = pydoc.allmethods(TestClass)
        self.assertDictEqual(methods, expected)


class PydocImportTest(PydocBaseTest):

    def setUp(self):
        self.test_dir = os.mkdir(TESTFN)
        self.addCleanup(rmtree, TESTFN)
        importlib.invalidate_caches()

    def test_badimport(self):
        # This tests the fix for issue 5230, where if pydoc found the module
        # but the module had an internal import error pydoc would report no doc
        # found.
        modname = 'testmod_xyzzy'
        testpairs = (
            ('i_am_not_here', 'i_am_not_here'),
            ('test.i_am_not_here_either', 'test.i_am_not_here_either'),
            ('test.i_am_not_here.neither_am_i', 'test.i_am_not_here'),
            ('i_am_not_here.{}'.format(modname), 'i_am_not_here'),
            ('test.{}'.format(modname), 'test.{}'.format(modname)),
            )

        sourcefn = os.path.join(TESTFN, modname) + os.extsep + "py"
        for importstring, expectedinmsg in testpairs:
            with open(sourcefn, 'w') as f:
                f.write("import {}\n".format(importstring))
            result = run_pydoc(modname, PYTHONPATH=TESTFN).decode("ascii")
            expected = badimport_pattern % (modname, expectedinmsg)
            self.assertEqual(expected, result)

    def test_apropos_with_bad_package(self):
        # Issue 7425 - pydoc -k failed when bad package on path
        pkgdir = os.path.join(TESTFN, "syntaxerr")
        os.mkdir(pkgdir)
        badsyntax = os.path.join(pkgdir, "__init__") + os.extsep + "py"
        with open(badsyntax, 'w') as f:
            f.write("invalid python syntax = $1\n")
        with self.restrict_walk_packages(path=[TESTFN]):
            with captured_stdout() as out:
                with captured_stderr() as err:
                    pydoc.apropos('xyzzy')
            # No result, no error
            self.assertEqual(out.getvalue(), '')
            self.assertEqual(err.getvalue(), '')
            # The package name is still matched
            with captured_stdout() as out:
                with captured_stderr() as err:
                    pydoc.apropos('syntaxerr')
            self.assertEqual(out.getvalue().strip(), 'syntaxerr')
            self.assertEqual(err.getvalue(), '')

    def test_apropos_with_unreadable_dir(self):
        # Issue 7367 - pydoc -k failed when unreadable dir on path
        self.unreadable_dir = os.path.join(TESTFN, "unreadable")
        os.mkdir(self.unreadable_dir, 0)
        self.addCleanup(os.rmdir, self.unreadable_dir)
        # Note, on Windows the directory appears to be still
        #   readable so this is not really testing the issue there
        with self.restrict_walk_packages(path=[TESTFN]):
            with captured_stdout() as out:
                with captured_stderr() as err:
                    pydoc.apropos('SOMEKEY')
        # No result, no error
        self.assertEqual(out.getvalue(), '')
        self.assertEqual(err.getvalue(), '')

    def test_apropos_empty_doc(self):
        pkgdir = os.path.join(TESTFN, 'walkpkg')
        os.mkdir(pkgdir)
        self.addCleanup(rmtree, pkgdir)
        init_path = os.path.join(pkgdir, '__init__.py')
        with open(init_path, 'w') as fobj:
            fobj.write("foo = 1")
        current_mode = stat.S_IMODE(os.stat(pkgdir).st_mode)
        try:
            os.chmod(pkgdir, current_mode & ~stat.S_IEXEC)
            with self.restrict_walk_packages(path=[TESTFN]), captured_stdout() as stdout:
                pydoc.apropos('')
            self.assertIn('walkpkg', stdout.getvalue())
        finally:
            os.chmod(pkgdir, current_mode)

    @unittest.skip('causes undesireable side-effects (#20128)')
    def test_modules(self):
        # See Helper.listmodules().
        num_header_lines = 2
        num_module_lines_min = 5  # Playing it safe.
        num_footer_lines = 3
        expected = num_header_lines + num_module_lines_min + num_footer_lines

        output = StringIO()
        helper = pydoc.Helper(output=output)
        helper('modules')
        result = output.getvalue().strip()
        num_lines = len(result.splitlines())

        self.assertGreaterEqual(num_lines, expected)

    @unittest.skip('causes undesireable side-effects (#20128)')
    def test_modules_search(self):
        # See Helper.listmodules().
        expected = 'pydoc - '

        output = StringIO()
        helper = pydoc.Helper(output=output)
        with captured_stdout() as help_io:
            helper('modules pydoc')
        result = help_io.getvalue()

        self.assertIn(expected, result)

    @unittest.skip('some buildbots are not cooperating (#20128)')
    def test_modules_search_builtin(self):
        expected = 'gc - '

        output = StringIO()
        helper = pydoc.Helper(output=output)
        with captured_stdout() as help_io:
            helper('modules garbage')
        result = help_io.getvalue()

        self.assertTrue(result.startswith(expected))

    def test_importfile(self):
        loaded_pydoc = pydoc.importfile(pydoc.__file__)

        self.assertIsNot(loaded_pydoc, pydoc)
        self.assertEqual(loaded_pydoc.__name__, 'pydoc')
        self.assertEqual(loaded_pydoc.__file__, pydoc.__file__)
        self.assertEqual(loaded_pydoc.__spec__, pydoc.__spec__)


class TestDescriptions(unittest.TestCase):

    def test_module(self):
        # Check that pydocfodder module can be described
        from test import pydocfodder
        doc = pydoc.render_doc(pydocfodder)
        self.assertIn("pydocfodder", doc)

    def test_class(self):
        class C: "New-style class"
        c = C()

        self.assertEqual(pydoc.describe(C), 'class C')
        self.assertEqual(pydoc.describe(c), 'C')
        expected = 'C in module %s object' % __name__
        self.assertIn(expected, pydoc.render_doc(c))

    def test_builtin(self):
        for name in ('str', 'str.translate', 'builtins.str',
                     'builtins.str.translate'):
            # test low-level function
            self.assertIsNotNone(pydoc.locate(name))
            # test high-level function
            try:
                pydoc.render_doc(name)
            except ImportError:
                self.fail('finding the doc of {!r} failed'.format(name))

        for name in ('notbuiltins', 'strrr', 'strr.translate',
                     'str.trrrranslate', 'builtins.strrr',
                     'builtins.str.trrranslate'):
            self.assertIsNone(pydoc.locate(name))
            self.assertRaises(ImportError, pydoc.render_doc, name)

    @staticmethod
    def _get_summary_line(o):
        text = pydoc.plain(pydoc.render_doc(o))
        lines = text.split('\n')
        assert len(lines) >= 2
        return lines[2]

    # these should include "self"
    def test_unbound_python_method(self):
        self.assertEqual(self._get_summary_line(textwrap.TextWrapper.wrap),
            "wrap(self, text)")

    @requires_docstrings
    def test_unbound_builtin_method(self):
        self.assertEqual(self._get_summary_line(_pickle.Pickler.dump),
            "dump(self, obj, /)")

    # these no longer include "self"
    def test_bound_python_method(self):
        t = textwrap.TextWrapper()
        self.assertEqual(self._get_summary_line(t.wrap),
            "wrap(text) method of textwrap.TextWrapper instance")

    @requires_docstrings
    def test_bound_builtin_method(self):
        s = StringIO()
        p = _pickle.Pickler(s)
        self.assertEqual(self._get_summary_line(p.dump),
            "dump(obj, /) method of _pickle.Pickler instance")

    # this should *never* include self!
    @requires_docstrings
    def test_module_level_callable(self):
        self.assertEqual(self._get_summary_line(os.stat),
            "stat(path, *, dir_fd=None, follow_symlinks=True)")


@unittest.skipUnless(threading, 'Threading required for this test.')
class PydocServerTest(unittest.TestCase):
    """Tests for pydoc._start_server"""

    def test_server(self):

        # Minimal test that starts the server, then stops it.
        def my_url_handler(url, content_type):
            text = 'the URL sent was: (%s, %s)' % (url, content_type)
            return text

        serverthread = pydoc._start_server(my_url_handler, port=0)
        self.assertIn('localhost', serverthread.docserver.address)

        starttime = time.time()
        timeout = 1  #seconds

        while serverthread.serving:
            time.sleep(.01)
            if serverthread.serving and time.time() - starttime > timeout:
                serverthread.stop()
                break

        self.assertEqual(serverthread.error, None)


class PydocUrlHandlerTest(PydocBaseTest):
    """Tests for pydoc._url_handler"""

    def test_content_type_err(self):
        f = pydoc._url_handler
        self.assertRaises(TypeError, f, 'A', '')
        self.assertRaises(TypeError, f, 'B', 'foobar')

    def test_url_requests(self):
        # Test for the correct title in the html pages returned.
        # This tests the different parts of the URL handler without
        # getting too picky about the exact html.
        requests = [
            ("", "Pydoc: Index of Modules"),
            ("get?key=", "Pydoc: Index of Modules"),
            ("index", "Pydoc: Index of Modules"),
            ("topics", "Pydoc: Topics"),
            ("keywords", "Pydoc: Keywords"),
            ("pydoc", "Pydoc: module pydoc"),
            ("get?key=pydoc", "Pydoc: module pydoc"),
            ("search?key=pydoc", "Pydoc: Search Results"),
            ("topic?key=def", "Pydoc: KEYWORD def"),
            ("topic?key=STRINGS", "Pydoc: TOPIC STRINGS"),
            ("foobar", "Pydoc: Error - foobar"),
            ("getfile?key=foobar", "Pydoc: Error - getfile?key=foobar"),
            ]

        with self.restrict_walk_packages():
            for url, title in requests:
                text = pydoc._url_handler(url, "text/html")
                result = get_html_title(text)
                self.assertEqual(result, title, text)

            path = string.__file__
            title = "Pydoc: getfile " + path
            url = "getfile?key=" + path
            text = pydoc._url_handler(url, "text/html")
            result = get_html_title(text)
            self.assertEqual(result, title)


class TestHelper(unittest.TestCase):
    def test_keywords(self):
        self.assertEqual(sorted(pydoc.Helper.keywords),
                         sorted(keyword.kwlist))

class PydocWithMetaClasses(unittest.TestCase):
    @unittest.skipIf(sys.flags.optimize >= 2,
                     "Docstrings are omitted with -O2 and above")
    @unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
                     'trace function introduces __locals__ unexpectedly')
    def test_DynamicClassAttribute(self):
        class Meta(type):
            def __getattr__(self, name):
                if name == 'ham':
                    return 'spam'
                return super().__getattr__(name)
        class DA(metaclass=Meta):
            @types.DynamicClassAttribute
            def ham(self):
                return 'eggs'
        expected_text_data_docstrings = tuple('\n |      ' + s if s else ''
                                      for s in expected_data_docstrings)
        output = StringIO()
        helper = pydoc.Helper(output=output)
        helper(DA)
        expected_text = expected_dynamicattribute_pattern % (
                (__name__,) + expected_text_data_docstrings[:2])
        result = output.getvalue().strip()
        self.assertEqual(expected_text, result)

    @unittest.skipIf(sys.flags.optimize >= 2,
                     "Docstrings are omitted with -O2 and above")
    @unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
                     'trace function introduces __locals__ unexpectedly')
    def test_virtualClassAttributeWithOneMeta(self):
        class Meta(type):
            def __dir__(cls):
                return ['__class__', '__module__', '__name__', 'LIFE']
            def __getattr__(self, name):
                if name =='LIFE':
                    return 42
                return super().__getattr(name)
        class Class(metaclass=Meta):
            pass
        output = StringIO()
        helper = pydoc.Helper(output=output)
        helper(Class)
        expected_text = expected_virtualattribute_pattern1 % __name__
        result = output.getvalue().strip()
        self.assertEqual(expected_text, result)

    @unittest.skipIf(sys.flags.optimize >= 2,
                     "Docstrings are omitted with -O2 and above")
    @unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
                     'trace function introduces __locals__ unexpectedly')
    def test_virtualClassAttributeWithTwoMeta(self):
        class Meta1(type):
            def __dir__(cls):
                return ['__class__', '__module__', '__name__', 'one']
            def __getattr__(self, name):
                if name =='one':
                    return 1
                return super().__getattr__(name)
        class Meta2(type):
            def __dir__(cls):
                return ['__class__', '__module__', '__name__', 'two']
            def __getattr__(self, name):
                if name =='two':
                    return 2
                return super().__getattr__(name)
        class Meta3(Meta1, Meta2):
            def __dir__(cls):
                return list(sorted(set(
                    ['__class__', '__module__', '__name__', 'three'] +
                    Meta1.__dir__(cls) + Meta2.__dir__(cls))))
            def __getattr__(self, name):
                if name =='three':
                    return 3
                return super().__getattr__(name)
        class Class1(metaclass=Meta1):
            pass
        class Class2(Class1, metaclass=Meta3):
            pass
        fail1 = fail2 = False
        output = StringIO()
        helper = pydoc.Helper(output=output)
        helper(Class1)
        expected_text1 = expected_virtualattribute_pattern2 % __name__
        result1 = output.getvalue().strip()
        self.assertEqual(expected_text1, result1)
        output = StringIO()
        helper = pydoc.Helper(output=output)
        helper(Class2)
        expected_text2 = expected_virtualattribute_pattern3 % __name__
        result2 = output.getvalue().strip()
        self.assertEqual(expected_text2, result2)

    @unittest.skipIf(sys.flags.optimize >= 2,
                     "Docstrings are omitted with -O2 and above")
    @unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
                     'trace function introduces __locals__ unexpectedly')
    def test_buggy_dir(self):
        class M(type):
            def __dir__(cls):
                return ['__class__', '__name__', 'missing', 'here']
        class C(metaclass=M):
            here = 'present!'
        output = StringIO()
        helper = pydoc.Helper(output=output)
        helper(C)
        expected_text = expected_missingattribute_pattern % __name__
        result = output.getvalue().strip()
        self.assertEqual(expected_text, result)

    def test_resolve_false(self):
        # Issue #23008: pydoc enum.{,Int}Enum failed
        # because bool(enum.Enum) is False.
        with captured_stdout() as help_io:
            pydoc.help('enum.Enum')
        helptext = help_io.getvalue()
        self.assertIn('class Enum', helptext)


@reap_threads
def test_main():
    try:
        test.support.run_unittest(PydocDocTest,
                                  PydocImportTest,
                                  TestDescriptions,
                                  PydocServerTest,
                                  PydocUrlHandlerTest,
                                  TestHelper,
                                  PydocWithMetaClasses,
                                  )
    finally:
        reap_children()

if __name__ == "__main__":
    test_main()