unittest_scoped_nodes.py

# Copyright (c) 2006-2014 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
# Copyright (c) 2011, 2013-2015 Google, Inc.
# Copyright (c) 2013-2020 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2013 Phil Schaf <flying-sheep@web.de>
# Copyright (c) 2014 Eevee (Alex Munroe) <amunroe@yelp.com>
# Copyright (c) 2015-2016 Ceridwen <ceridwenv@gmail.com>
# Copyright (c) 2015 Rene Zhang <rz99@cornell.edu>
# Copyright (c) 2015 Florian Bruhin <me@the-compiler.org>
# Copyright (c) 2015 Philip Lorenz <philip@bithub.de>
# Copyright (c) 2016 Jakub Wilk <jwilk@jwilk.net>
# Copyright (c) 2017, 2019 Łukasz Rogalski <rogalski.91@gmail.com>
# Copyright (c) 2017-2018 Bryce Guinta <bryce.paul.guinta@gmail.com>
# Copyright (c) 2017 Derek Gustafson <degustaf@gmail.com>
# Copyright (c) 2018-2019 Ville Skyttä <ville.skytta@iki.fi>
# Copyright (c) 2018 brendanator <brendan.maginnis@gmail.com>
# Copyright (c) 2018 Anthony Sottile <asottile@umich.edu>
# Copyright (c) 2019-2021 hippo91 <guillaume.peillex@gmail.com>
# Copyright (c) 2019 Ashley Whetter <ashley@awhetter.co.uk>
# Copyright (c) 2019 Hugo van Kemenade <hugovk@users.noreply.github.com>
# Copyright (c) 2019 Peter de Blanc <peter@standard.ai>
# Copyright (c) 2020 David Gilman <davidgilman1@gmail.com>
# Copyright (c) 2020 Tim Martin <tim@asymptotic.co.uk>
# Copyright (c) 2021 Marc Mueller <30130371+cdce8p@users.noreply.github.com>
# Copyright (c) 2021 Pierre Sassoulas <pierre.sassoulas@gmail.com>

# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
# For details: https://github.com/PyCQA/astroid/blob/master/LICENSE

"""tests for specific behaviour of astroid scoped nodes (i.e. module, class and
function)
"""
import datetime
import os
import sys
import textwrap
import unittest
from functools import partial

import pytest

from astroid import builder, nodes, objects, scoped_nodes, test_utils, util
from astroid.bases import BUILTINS, BoundMethod, Generator, Instance, UnboundMethod
from astroid.exceptions import (
    AttributeInferenceError,
    DuplicateBasesError,
    InconsistentMroError,
    InferenceError,
    MroError,
    NameInferenceError,
    NoDefault,
    ResolveError,
    TooManyLevelsError,
)

from . import resources

try:
    import six  # pylint: disable=unused-import

    HAS_SIX = True
except ImportError:
    HAS_SIX = False


def _test_dict_interface(self, node, test_attr):
    self.assertIs(node[test_attr], node[test_attr])
    self.assertIn(test_attr, node)
    node.keys()
    node.values()
    node.items()
    iter(node)


class ModuleLoader(resources.SysPathSetup):
    def setUp(self):
        super().setUp()
        self.module = resources.build_file("data/module.py", "data.module")
        self.module2 = resources.build_file("data/module2.py", "data.module2")
        self.nonregr = resources.build_file("data/nonregr.py", "data.nonregr")
        self.pack = resources.build_file("data/__init__.py", "data")


class ModuleNodeTest(ModuleLoader, unittest.TestCase):
    def test_special_attributes(self):
        self.assertEqual(len(self.module.getattr("__name__")), 1)
        self.assertIsInstance(self.module.getattr("__name__")[0], nodes.Const)
        self.assertEqual(self.module.getattr("__name__")[0].value, "data.module")
        self.assertEqual(len(self.module.getattr("__doc__")), 1)
        self.assertIsInstance(self.module.getattr("__doc__")[0], nodes.Const)
        self.assertEqual(
            self.module.getattr("__doc__")[0].value, "test module for astroid\n"
        )
        self.assertEqual(len(self.module.getattr("__file__")), 1)
        self.assertIsInstance(self.module.getattr("__file__")[0], nodes.Const)
        self.assertEqual(
            self.module.getattr("__file__")[0].value,
            os.path.abspath(resources.find("data/module.py")),
        )
        self.assertEqual(len(self.module.getattr("__dict__")), 1)
        self.assertIsInstance(self.module.getattr("__dict__")[0], nodes.Dict)
        self.assertRaises(AttributeInferenceError, self.module.getattr, "__path__")
        self.assertEqual(len(self.pack.getattr("__path__")), 1)
        self.assertIsInstance(self.pack.getattr("__path__")[0], nodes.List)

    def test_dict_interface(self):
        _test_dict_interface(self, self.module, "YO")

    def test_getattr(self):
        yo = self.module.getattr("YO")[0]
        self.assertIsInstance(yo, nodes.ClassDef)
        self.assertEqual(yo.name, "YO")
        red = next(self.module.igetattr("redirect"))
        self.assertIsInstance(red, nodes.FunctionDef)
        self.assertEqual(red.name, "four_args")
        namenode = next(self.module.igetattr("NameNode"))
        self.assertIsInstance(namenode, nodes.ClassDef)
        self.assertEqual(namenode.name, "Name")
        # resolve packageredirection
        mod = resources.build_file(
            "data/appl/myConnection.py", "data.appl.myConnection"
        )
        ssl = next(mod.igetattr("SSL1"))
        cnx = next(ssl.igetattr("Connection"))
        self.assertEqual(cnx.__class__, nodes.ClassDef)
        self.assertEqual(cnx.name, "Connection")
        self.assertEqual(cnx.root().name, "data.SSL1.Connection1")
        self.assertEqual(len(self.nonregr.getattr("enumerate")), 2)
        self.assertRaises(InferenceError, self.nonregr.igetattr, "YOAA")

    def test_wildcard_import_names(self):
        m = resources.build_file("data/all.py", "all")
        self.assertEqual(m.wildcard_import_names(), ["Aaa", "_bla", "name"])
        m = resources.build_file("data/notall.py", "notall")
        res = sorted(m.wildcard_import_names())
        self.assertEqual(res, ["Aaa", "func", "name", "other"])

    def test_public_names(self):
        m = builder.parse(
            """
        name = 'a'
        _bla = 2
        other = 'o'
        class Aaa: pass
        def func(): print('yo')
        __all__ = 'Aaa', '_bla', 'name'
        """
        )
        values = sorted(["Aaa", "name", "other", "func"])
        self.assertEqual(sorted(m.public_names()), values)
        m = builder.parse(
            """
        name = 'a'
        _bla = 2
        other = 'o'
        class Aaa: pass

        def func(): return 'yo'
        """
        )
        res = sorted(m.public_names())
        self.assertEqual(res, values)

        m = builder.parse(
            """
            from missing import tzop
            trop = "test"
            __all__ = (trop, "test1", tzop, 42)
        """
        )
        res = sorted(m.public_names())
        self.assertEqual(res, ["trop", "tzop"])

        m = builder.parse(
            """
            test = tzop = 42
            __all__ = ('test', ) + ('tzop', )
        """
        )
        res = sorted(m.public_names())
        self.assertEqual(res, ["test", "tzop"])

    def test_module_getattr(self):
        data = """
            appli = application
            appli += 2
            del appli
        """
        astroid = builder.parse(data, __name__)
        # test del statement not returned by getattr
        self.assertEqual(len(astroid.getattr("appli")), 2, astroid.getattr("appli"))

    def test_relative_to_absolute_name(self):
        # package
        mod = nodes.Module("very.multi.package", "doc")
        mod.package = True
        modname = mod.relative_to_absolute_name("utils", 1)
        self.assertEqual(modname, "very.multi.package.utils")
        modname = mod.relative_to_absolute_name("utils", 2)
        self.assertEqual(modname, "very.multi.utils")
        modname = mod.relative_to_absolute_name("utils", 0)
        self.assertEqual(modname, "very.multi.package.utils")
        modname = mod.relative_to_absolute_name("", 1)
        self.assertEqual(modname, "very.multi.package")
        # non package
        mod = nodes.Module("very.multi.module", "doc")
        mod.package = False
        modname = mod.relative_to_absolute_name("utils", 0)
        self.assertEqual(modname, "very.multi.utils")
        modname = mod.relative_to_absolute_name("utils", 1)
        self.assertEqual(modname, "very.multi.utils")
        modname = mod.relative_to_absolute_name("utils", 2)
        self.assertEqual(modname, "very.utils")
        modname = mod.relative_to_absolute_name("", 1)
        self.assertEqual(modname, "very.multi")

    def test_relative_to_absolute_name_beyond_top_level(self):
        mod = nodes.Module("a.b.c", "")
        mod.package = True
        for level in (5, 4):
            with self.assertRaises(TooManyLevelsError) as cm:
                mod.relative_to_absolute_name("test", level)

            expected = (
                "Relative import with too many levels "
                f"({level-1}) for module {mod.name!r}"
            )
            self.assertEqual(expected, str(cm.exception))

    def test_import_1(self):
        data = """from . import subpackage"""
        sys.path.insert(0, resources.find("data"))
        astroid = builder.parse(data, "package", "data/package/__init__.py")
        try:
            m = astroid.import_module("", level=1)
            self.assertEqual(m.name, "package")
            inferred = list(astroid.igetattr("subpackage"))
            self.assertEqual(len(inferred), 1)
            self.assertEqual(inferred[0].name, "package.subpackage")
        finally:
            del sys.path[0]

    def test_import_2(self):
        data = """from . import subpackage as pouet"""
        astroid = builder.parse(data, "package", "data/package/__init__.py")
        sys.path.insert(0, resources.find("data"))
        try:
            m = astroid.import_module("", level=1)
            self.assertEqual(m.name, "package")
            inferred = list(astroid.igetattr("pouet"))
            self.assertEqual(len(inferred), 1)
            self.assertEqual(inferred[0].name, "package.subpackage")
        finally:
            del sys.path[0]

    def test_file_stream_in_memory(self):
        data = """irrelevant_variable is irrelevant"""
        astroid = builder.parse(data, "in_memory")
        with astroid.stream() as stream:
            self.assertEqual(stream.read().decode(), data)

    def test_file_stream_physical(self):
        path = resources.find("data/all.py")
        astroid = builder.AstroidBuilder().file_build(path, "all")
        with open(path, "rb") as file_io:
            with astroid.stream() as stream:
                self.assertEqual(stream.read(), file_io.read())

    def test_file_stream_api(self):
        path = resources.find("data/all.py")
        file_build = builder.AstroidBuilder().file_build(path, "all")
        with self.assertRaises(AttributeError):
            # pylint: disable=pointless-statement
            file_build.file_stream

    def test_stream_api(self):
        path = resources.find("data/all.py")
        astroid = builder.AstroidBuilder().file_build(path, "all")
        stream = astroid.stream()
        self.assertTrue(hasattr(stream, "close"))
        with stream:
            with open(path, "rb") as file_io:
                self.assertEqual(stream.read(), file_io.read())


class FunctionNodeTest(ModuleLoader, unittest.TestCase):
    def test_special_attributes(self):
        func = self.module2["make_class"]
        self.assertEqual(len(func.getattr("__name__")), 1)
        self.assertIsInstance(func.getattr("__name__")[0], nodes.Const)
        self.assertEqual(func.getattr("__name__")[0].value, "make_class")
        self.assertEqual(len(func.getattr("__doc__")), 1)
        self.assertIsInstance(func.getattr("__doc__")[0], nodes.Const)
        self.assertEqual(
            func.getattr("__doc__")[0].value,
            "check base is correctly resolved to Concrete0",
        )
        self.assertEqual(len(self.module.getattr("__dict__")), 1)
        self.assertIsInstance(self.module.getattr("__dict__")[0], nodes.Dict)

    def test_dict_interface(self):
        _test_dict_interface(self, self.module["global_access"], "local")

    def test_default_value(self):
        func = self.module2["make_class"]
        self.assertIsInstance(func.args.default_value("base"), nodes.Attribute)
        self.assertRaises(NoDefault, func.args.default_value, "args")
        self.assertRaises(NoDefault, func.args.default_value, "kwargs")
        self.assertRaises(NoDefault, func.args.default_value, "any")
        # self.assertIsInstance(func.mularg_class('args'), nodes.Tuple)
        # self.assertIsInstance(func.mularg_class('kwargs'), nodes.Dict)
        # self.assertIsNone(func.mularg_class('base'))

    def test_navigation(self):
        function = self.module["global_access"]
        self.assertEqual(function.statement(), function)
        l_sibling = function.previous_sibling()
        # check taking parent if child is not a stmt
        self.assertIsInstance(l_sibling, nodes.Assign)
        child = function.args.args[0]
        self.assertIs(l_sibling, child.previous_sibling())
        r_sibling = function.next_sibling()
        self.assertIsInstance(r_sibling, nodes.ClassDef)
        self.assertEqual(r_sibling.name, "YO")
        self.assertIs(r_sibling, child.next_sibling())
        last = r_sibling.next_sibling().next_sibling().next_sibling()
        self.assertIsInstance(last, nodes.Assign)
        self.assertIsNone(last.next_sibling())
        first = l_sibling.root().body[0]
        self.assertIsNone(first.previous_sibling())

    def test_four_args(self):
        func = self.module["four_args"]
        local = sorted(func.keys())
        self.assertEqual(local, ["a", "b", "c", "d"])
        self.assertEqual(func.type, "function")

    def test_format_args(self):
        func = self.module2["make_class"]
        self.assertEqual(
            func.args.format_args(), "any, base=data.module.YO, *args, **kwargs"
        )
        func = self.module["four_args"]
        self.assertEqual(func.args.format_args(), "a, b, c, d")

    def test_format_args_keyword_only_args(self):
        node = (
            builder.parse(
                """
        def test(a: int, *, b: dict):
            pass
        """
            )
            .body[-1]
            .args
        )
        formatted = node.format_args()
        self.assertEqual(formatted, "a: int, *, b: dict")

    def test_is_generator(self):
        self.assertTrue(self.module2["generator"].is_generator())
        self.assertFalse(self.module2["not_a_generator"].is_generator())
        self.assertFalse(self.module2["make_class"].is_generator())

    def test_is_abstract(self):
        method = self.module2["AbstractClass"]["to_override"]
        self.assertTrue(method.is_abstract(pass_is_abstract=False))
        self.assertEqual(method.qname(), "data.module2.AbstractClass.to_override")
        self.assertEqual(method.pytype(), "%s.instancemethod" % BUILTINS)
        method = self.module2["AbstractClass"]["return_something"]
        self.assertFalse(method.is_abstract(pass_is_abstract=False))
        # non regression : test raise "string" doesn't cause an exception in is_abstract
        func = self.module2["raise_string"]
        self.assertFalse(func.is_abstract(pass_is_abstract=False))

    def test_is_abstract_decorated(self):
        methods = builder.extract_node(
            """
            import abc

            class Klass(object):
                @abc.abstractproperty
                def prop(self):  #@
                   pass

                @abc.abstractmethod
                def method1(self):  #@
                   pass

                some_other_decorator = lambda x: x
                @some_other_decorator
                def method2(self):  #@
                   pass
         """
        )
        self.assertTrue(methods[0].is_abstract(pass_is_abstract=False))
        self.assertTrue(methods[1].is_abstract(pass_is_abstract=False))
        self.assertFalse(methods[2].is_abstract(pass_is_abstract=False))

    ##     def test_raises(self):
    ##         method = self.module2['AbstractClass']['to_override']
    ##         self.assertEqual([str(term) for term in method.raises()],
    ##                           ["Call(Name('NotImplementedError'), [], None, None)"] )

    ##     def test_returns(self):
    ##         method = self.module2['AbstractClass']['return_something']
    ##         # use string comp since Node doesn't handle __cmp__
    ##         self.assertEqual([str(term) for term in method.returns()],
    ##                           ["Const('toto')", "Const(None)"])

    def test_lambda_pytype(self):
        data = """
            def f():
                g = lambda: None
        """
        astroid = builder.parse(data)
        g = list(astroid["f"].ilookup("g"))[0]
        self.assertEqual(g.pytype(), "%s.function" % BUILTINS)

    def test_lambda_qname(self):
        astroid = builder.parse("lmbd = lambda: None", __name__)
        self.assertEqual("%s.<lambda>" % __name__, astroid["lmbd"].parent.value.qname())

    def test_is_method(self):
        data = """
            class A:
                def meth1(self):
                    return 1
                @classmethod
                def meth2(cls):
                    return 2
                @staticmethod
                def meth3():
                    return 3

            def function():
                return 0

            @staticmethod
            def sfunction():
                return -1
        """
        astroid = builder.parse(data)
        self.assertTrue(astroid["A"]["meth1"].is_method())
        self.assertTrue(astroid["A"]["meth2"].is_method())
        self.assertTrue(astroid["A"]["meth3"].is_method())
        self.assertFalse(astroid["function"].is_method())
        self.assertFalse(astroid["sfunction"].is_method())

    def test_argnames(self):
        code = "def f(a, b, c, *args, **kwargs): pass"
        astroid = builder.parse(code, __name__)
        self.assertEqual(astroid["f"].argnames(), ["a", "b", "c", "args", "kwargs"])

    def test_return_nothing(self):
        """test inferred value on a function with empty return"""
        data = """
            def func():
                return

            a = func()
        """
        astroid = builder.parse(data)
        call = astroid.body[1].value
        func_vals = call.inferred()
        self.assertEqual(len(func_vals), 1)
        self.assertIsInstance(func_vals[0], nodes.Const)
        self.assertIsNone(func_vals[0].value)

    def test_func_instance_attr(self):
        """test instance attributes for functions"""
        data = """
            def test():
                print(test.bar)

            test.bar = 1
            test()
        """
        astroid = builder.parse(data, "mod")
        func = astroid.body[2].value.func.inferred()[0]
        self.assertIsInstance(func, nodes.FunctionDef)
        self.assertEqual(func.name, "test")
        one = func.getattr("bar")[0].inferred()[0]
        self.assertIsInstance(one, nodes.Const)
        self.assertEqual(one.value, 1)

    def test_type_builtin_descriptor_subclasses(self):
        astroid = builder.parse(
            """
            class classonlymethod(classmethod):
                pass
            class staticonlymethod(staticmethod):
                pass

            class Node:
                @classonlymethod
                def clsmethod_subclass(cls):
                    pass
                @classmethod
                def clsmethod(cls):
                    pass
                @staticonlymethod
                def staticmethod_subclass(cls):
                    pass
                @staticmethod
                def stcmethod(cls):
                    pass
        """
        )
        node = astroid.locals["Node"][0]
        self.assertEqual(node.locals["clsmethod_subclass"][0].type, "classmethod")
        self.assertEqual(node.locals["clsmethod"][0].type, "classmethod")
        self.assertEqual(node.locals["staticmethod_subclass"][0].type, "staticmethod")
        self.assertEqual(node.locals["stcmethod"][0].type, "staticmethod")

    def test_decorator_builtin_descriptors(self):
        astroid = builder.parse(
            """
            def static_decorator(platform=None, order=50):
                def wrapper(f):
                    f.cgm_module = True
                    f.cgm_module_order = order
                    f.cgm_module_platform = platform
                    return staticmethod(f)
                return wrapper

            def long_classmethod_decorator(platform=None, order=50):
                def wrapper(f):
                    def wrapper2(f):
                        def wrapper3(f):
                            f.cgm_module = True
                            f.cgm_module_order = order
                            f.cgm_module_platform = platform
                            return classmethod(f)
                        return wrapper3(f)
                    return wrapper2(f)
                return wrapper

            def classmethod_decorator(platform=None):
                def wrapper(f):
                    f.platform = platform
                    return classmethod(f)
                return wrapper

            def classmethod_wrapper(fn):
                def wrapper(cls, *args, **kwargs):
                    result = fn(cls, *args, **kwargs)
                    return result

                return classmethod(wrapper)

            def staticmethod_wrapper(fn):
                def wrapper(*args, **kwargs):
                    return fn(*args, **kwargs)
                return staticmethod(wrapper)

            class SomeClass(object):
                @static_decorator()
                def static(node, cfg):
                    pass
                @classmethod_decorator()
                def classmethod(cls):
                    pass
                @static_decorator
                def not_so_static(node):
                    pass
                @classmethod_decorator
                def not_so_classmethod(node):
                    pass
                @classmethod_wrapper
                def classmethod_wrapped(cls):
                    pass
                @staticmethod_wrapper
                def staticmethod_wrapped():
                    pass
                @long_classmethod_decorator()
                def long_classmethod(cls):
                    pass
        """
        )
        node = astroid.locals["SomeClass"][0]
        self.assertEqual(node.locals["static"][0].type, "staticmethod")
        self.assertEqual(node.locals["classmethod"][0].type, "classmethod")
        self.assertEqual(node.locals["not_so_static"][0].type, "method")
        self.assertEqual(node.locals["not_so_classmethod"][0].type, "method")
        self.assertEqual(node.locals["classmethod_wrapped"][0].type, "classmethod")
        self.assertEqual(node.locals["staticmethod_wrapped"][0].type, "staticmethod")
        self.assertEqual(node.locals["long_classmethod"][0].type, "classmethod")

    def test_igetattr(self):
        func = builder.extract_node(
            """
        def test():
            pass
        """
        )
        func.instance_attrs["value"] = [nodes.Const(42)]
        value = func.getattr("value")
        self.assertEqual(len(value), 1)
        self.assertIsInstance(value[0], nodes.Const)
        self.assertEqual(value[0].value, 42)
        inferred = next(func.igetattr("value"))
        self.assertIsInstance(inferred, nodes.Const)
        self.assertEqual(inferred.value, 42)

    def test_return_annotation_is_not_the_last(self):
        func = builder.extract_node(
            """
        def test() -> bytes:
            pass
            pass
            return
        """
        )
        last_child = func.last_child()
        self.assertIsInstance(last_child, nodes.Return)
        self.assertEqual(func.tolineno, 5)

    def test_method_init_subclass(self):
        klass = builder.extract_node(
            """
        class MyClass:
            def __init_subclass__(cls):
                pass
        """
        )
        method = klass["__init_subclass__"]
        self.assertEqual([n.name for n in method.args.args], ["cls"])
        self.assertEqual(method.type, "classmethod")

    def test_dunder_class_local_to_method(self):
        node = builder.extract_node(
            """
        class MyClass:
            def test(self):
                __class__ #@
        """
        )
        inferred = next(node.infer())
        self.assertIsInstance(inferred, nodes.ClassDef)
        self.assertEqual(inferred.name, "MyClass")

    def test_dunder_class_local_to_function(self):
        node = builder.extract_node(
            """
        def test(self):
            __class__ #@
        """
        )
        with self.assertRaises(NameInferenceError):
            next(node.infer())

    def test_dunder_class_local_to_classmethod(self):
        node = builder.extract_node(
            """
        class MyClass:
            @classmethod
            def test(cls):
                __class__ #@
        """
        )
        inferred = next(node.infer())
        self.assertIsInstance(inferred, nodes.ClassDef)
        self.assertEqual(inferred.name, "MyClass")


class ClassNodeTest(ModuleLoader, unittest.TestCase):
    def test_dict_interface(self):
        _test_dict_interface(self, self.module["YOUPI"], "method")

    def test_cls_special_attributes_1(self):
        cls = self.module["YO"]
        self.assertEqual(len(cls.getattr("__bases__")), 1)
        self.assertEqual(len(cls.getattr("__name__")), 1)
        self.assertIsInstance(cls.getattr("__name__")[0], nodes.Const)
        self.assertEqual(cls.getattr("__name__")[0].value, "YO")
        self.assertEqual(len(cls.getattr("__doc__")), 1)
        self.assertIsInstance(cls.getattr("__doc__")[0], nodes.Const)
        self.assertEqual(cls.getattr("__doc__")[0].value, "hehe\n    haha")
        # YO is an old styled class for Python 2.7
        # May want to stop locals from referencing namespaced variables in the future
        module_attr_num = 4
        self.assertEqual(len(cls.getattr("__module__")), module_attr_num)
        self.assertIsInstance(cls.getattr("__module__")[0], nodes.Const)
        self.assertEqual(cls.getattr("__module__")[0].value, "data.module")
        self.assertEqual(len(cls.getattr("__dict__")), 1)
        if not cls.newstyle:
            self.assertRaises(AttributeInferenceError, cls.getattr, "__mro__")
        for cls in (nodes.List._proxied, nodes.Const(1)._proxied):
            self.assertEqual(len(cls.getattr("__bases__")), 1)
            self.assertEqual(len(cls.getattr("__name__")), 1)
            self.assertEqual(
                len(cls.getattr("__doc__")), 1, (cls, cls.getattr("__doc__"))
            )
            self.assertEqual(cls.getattr("__doc__")[0].value, cls.doc)
            self.assertEqual(len(cls.getattr("__module__")), 4)
            self.assertEqual(len(cls.getattr("__dict__")), 1)
            self.assertEqual(len(cls.getattr("__mro__")), 1)

    def test__mro__attribute(self):
        node = builder.extract_node(
            """
        class A(object): pass
        class B(object): pass
        class C(A, B): pass
        """
        )
        mro = node.getattr("__mro__")[0]
        self.assertIsInstance(mro, nodes.Tuple)
        self.assertEqual(mro.elts, node.mro())

    def test__bases__attribute(self):
        node = builder.extract_node(
            """
        class A(object): pass
        class B(object): pass
        class C(A, B): pass
        class D(C): pass
        """
        )
        bases = node.getattr("__bases__")[0]
        self.assertIsInstance(bases, nodes.Tuple)
        self.assertEqual(len(bases.elts), 1)
        self.assertIsInstance(bases.elts[0], nodes.ClassDef)
        self.assertEqual(bases.elts[0].name, "C")

    def test_cls_special_attributes_2(self):
        astroid = builder.parse(
            """
            class A(object): pass
            class B(object): pass

            A.__bases__ += (B,)
        """,
            __name__,
        )
        self.assertEqual(len(astroid["A"].getattr("__bases__")), 2)
        self.assertIsInstance(astroid["A"].getattr("__bases__")[1], nodes.Tuple)
        self.assertIsInstance(astroid["A"].getattr("__bases__")[0], nodes.AssignAttr)

    def test_instance_special_attributes(self):
        for inst in (Instance(self.module["YO"]), nodes.List(), nodes.Const(1)):
            self.assertRaises(AttributeInferenceError, inst.getattr, "__mro__")
            self.assertRaises(AttributeInferenceError, inst.getattr, "__bases__")
            self.assertRaises(AttributeInferenceError, inst.getattr, "__name__")
            self.assertEqual(len(inst.getattr("__dict__")), 1)
            self.assertEqual(len(inst.getattr("__doc__")), 1)

    def test_navigation(self):
        klass = self.module["YO"]
        self.assertEqual(klass.statement(), klass)
        l_sibling = klass.previous_sibling()
        self.assertTrue(isinstance(l_sibling, nodes.FunctionDef), l_sibling)
        self.assertEqual(l_sibling.name, "global_access")
        r_sibling = klass.next_sibling()
        self.assertIsInstance(r_sibling, nodes.ClassDef)
        self.assertEqual(r_sibling.name, "YOUPI")

    def test_local_attr_ancestors(self):
        module = builder.parse(
            """
        class A():
            def __init__(self): pass
        class B(A): pass
        class C(B): pass
        class D(object): pass
        class F(): pass
        class E(F, D): pass
        """
        )
        # Test old-style (Python 2) / new-style (Python 3+) ancestors lookups
        klass2 = module["C"]
        it = klass2.local_attr_ancestors("__init__")
        anc_klass = next(it)
        self.assertIsInstance(anc_klass, nodes.ClassDef)
        self.assertEqual(anc_klass.name, "A")
        anc_klass = next(it)
        self.assertIsInstance(anc_klass, nodes.ClassDef)
        self.assertEqual(anc_klass.name, "object")
        self.assertRaises(StopIteration, partial(next, it))

        it = klass2.local_attr_ancestors("method")
        self.assertRaises(StopIteration, partial(next, it))

        # Test mixed-style ancestor lookups
        klass2 = module["E"]
        it = klass2.local_attr_ancestors("__init__")
        anc_klass = next(it)
        self.assertIsInstance(anc_klass, nodes.ClassDef)
        self.assertEqual(anc_klass.name, "object")
        self.assertRaises(StopIteration, partial(next, it))

    def test_local_attr_mro(self):
        module = builder.parse(
            """
        class A(object):
            def __init__(self): pass
        class B(A):
            def __init__(self, arg, arg2): pass
        class C(A): pass
        class D(C, B): pass
        """
        )
        dclass = module["D"]
        init = dclass.local_attr("__init__")[0]
        self.assertIsInstance(init, nodes.FunctionDef)
        self.assertEqual(init.parent.name, "B")

        cclass = module["C"]
        init = cclass.local_attr("__init__")[0]
        self.assertIsInstance(init, nodes.FunctionDef)
        self.assertEqual(init.parent.name, "A")

        ancestors = list(dclass.local_attr_ancestors("__init__"))
        self.assertEqual([node.name for node in ancestors], ["B", "A", "object"])

    def test_instance_attr_ancestors(self):
        klass2 = self.module["YOUPI"]
        it = klass2.instance_attr_ancestors("yo")
        anc_klass = next(it)
        self.assertIsInstance(anc_klass, nodes.ClassDef)
        self.assertEqual(anc_klass.name, "YO")
        self.assertRaises(StopIteration, partial(next, it))
        klass2 = self.module["YOUPI"]
        it = klass2.instance_attr_ancestors("member")
        self.assertRaises(StopIteration, partial(next, it))

    def test_methods(self):
        expected_methods = {"__init__", "class_method", "method", "static_method"}
        klass2 = self.module["YOUPI"]
        methods = {m.name for m in klass2.methods()}
        self.assertTrue(methods.issuperset(expected_methods))
        methods = {m.name for m in klass2.mymethods()}
        self.assertSetEqual(expected_methods, methods)
        klass2 = self.module2["Specialization"]
        methods = {m.name for m in klass2.mymethods()}
        self.assertSetEqual(set(), methods)
        method_locals = klass2.local_attr("method")
        self.assertEqual(len(method_locals), 1)
        self.assertEqual(method_locals[0].name, "method")
        self.assertRaises(AttributeInferenceError, klass2.local_attr, "nonexistent")
        methods = {m.name for m in klass2.methods()}
        self.assertTrue(methods.issuperset(expected_methods))

    # def test_rhs(self):
    #    my_dict = self.module['MY_DICT']
    #    self.assertIsInstance(my_dict.rhs(), nodes.Dict)
    #    a = self.module['YO']['a']
    #    value = a.rhs()
    #    self.assertIsInstance(value, nodes.Const)
    #    self.assertEqual(value.value, 1)

    def test_ancestors(self):
        klass = self.module["YOUPI"]
        self.assertEqual(["YO", "object"], [a.name for a in klass.ancestors()])
        klass = self.module2["Specialization"]
        self.assertEqual(["YOUPI", "YO", "object"], [a.name for a in klass.ancestors()])

    def test_type(self):
        klass = self.module["YOUPI"]
        self.assertEqual(klass.type, "class")
        klass = self.module2["Metaclass"]
        self.assertEqual(klass.type, "metaclass")
        klass = self.module2["MyException"]
        self.assertEqual(klass.type, "exception")
        klass = self.module2["MyError"]
        self.assertEqual(klass.type, "exception")
        # the following class used to be detected as a metaclass
        # after the fix which used instance._proxied in .ancestors(),
        # when in fact it is a normal class
        klass = self.module2["NotMetaclass"]
        self.assertEqual(klass.type, "class")

    def test_inner_classes(self):
        eee = self.nonregr["Ccc"]["Eee"]
        self.assertEqual([n.name for n in eee.ancestors()], ["Ddd", "Aaa", "object"])

    def test_classmethod_attributes(self):
        data = """
            class WebAppObject(object):
                def registered(cls, application):
                    cls.appli = application
                    cls.schema = application.schema
                    cls.config = application.config
                    return cls
                registered = classmethod(registered)
        """
        astroid = builder.parse(data, __name__)
        cls = astroid["WebAppObject"]
        assert_keys = [
            "__module__",
            "__qualname__",
            "appli",
            "config",
            "registered",
            "schema",
        ]
        self.assertEqual(sorted(cls.locals.keys()), assert_keys)

    def test_class_getattr(self):
        data = """
            class WebAppObject(object):
                appli = application
                appli += 2
                del self.appli
        """
        astroid = builder.parse(data, __name__)
        cls = astroid["WebAppObject"]
        # test del statement not returned by getattr
        self.assertEqual(len(cls.getattr("appli")), 2)

    def test_instance_getattr(self):
        data = """
            class WebAppObject(object):
                def __init__(self, application):
                    self.appli = application
                    self.appli += 2
                    del self.appli
         """
        astroid = builder.parse(data)
        inst = Instance(astroid["WebAppObject"])
        # test del statement not returned by getattr
        self.assertEqual(len(inst.getattr("appli")), 2)

    def test_instance_getattr_with_class_attr(self):
        data = """
            class Parent:
                aa = 1
                cc = 1

            class Klass(Parent):
                aa = 0
                bb = 0

                def incr(self, val):
                    self.cc = self.aa
                    if val > self.aa:
                        val = self.aa
                    if val < self.bb:
                        val = self.bb
                    self.aa += val
        """
        astroid = builder.parse(data)
        inst = Instance(astroid["Klass"])
        self.assertEqual(len(inst.getattr("aa")), 3, inst.getattr("aa"))
        self.assertEqual(len(inst.getattr("bb")), 1, inst.getattr("bb"))
        self.assertEqual(len(inst.getattr("cc")), 2, inst.getattr("cc"))

    def test_getattr_method_transform(self):
        data = """
            class Clazz(object):

                def m1(self, value):
                    self.value = value
                m2 = m1

            def func(arg1, arg2):
                "function that will be used as a method"
                return arg1.value + arg2

            Clazz.m3 = func
            inst = Clazz()
            inst.m4 = func
        """
        astroid = builder.parse(data)
        cls = astroid["Clazz"]
        # test del statement not returned by getattr
        for method in ("m1", "m2", "m3"):
            inferred = list(cls.igetattr(method))
            self.assertEqual(len(inferred), 1)
            self.assertIsInstance(inferred[0], UnboundMethod)
            inferred = list(Instance(cls).igetattr(method))
            self.assertEqual(len(inferred), 1)
            self.assertIsInstance(inferred[0], BoundMethod)
        inferred = list(Instance(cls).igetattr("m4"))
        self.assertEqual(len(inferred), 1)
        self.assertIsInstance(inferred[0], nodes.FunctionDef)

    def test_getattr_from_grandpa(self):
        data = """
            class Future:
                attr = 1

            class Present(Future):
                pass

            class Past(Present):
                pass
        """
        astroid = builder.parse(data)
        past = astroid["Past"]
        attr = past.getattr("attr")
        self.assertEqual(len(attr), 1)
        attr1 = attr[0]
        self.assertIsInstance(attr1, nodes.AssignName)
        self.assertEqual(attr1.name, "attr")

    def test_function_with_decorator_lineno(self):
        data = """
            @f(a=2,
               b=3)
            def g1(x):
                print(x)

            @f(a=2,
               b=3)
            def g2():
                pass
        """
        astroid = builder.parse(data)
        self.assertEqual(astroid["g1"].fromlineno, 4)
        self.assertEqual(astroid["g1"].tolineno, 5)
        self.assertEqual(astroid["g2"].fromlineno, 9)
        self.assertEqual(astroid["g2"].tolineno, 10)

    def test_metaclass_error(self):
        astroid = builder.parse(
            """
            class Test(object):
                __metaclass__ = typ
        """
        )
        klass = astroid["Test"]
        self.assertFalse(klass.metaclass())

    def test_metaclass_yes_leak(self):
        astroid = builder.parse(
            """
            # notice `ab` instead of `abc`
            from ab import ABCMeta

            class Meta(object):
                __metaclass__ = ABCMeta
        """
        )
        klass = astroid["Meta"]
        self.assertIsNone(klass.metaclass())

    def test_metaclass_type(self):
        klass = builder.extract_node(
            """
            def with_metaclass(meta, base=object):
                return meta("NewBase", (base, ), {})

            class ClassWithMeta(with_metaclass(type)): #@
                pass
        """
        )
        self.assertEqual(
            ["NewBase", "object"], [base.name for base in klass.ancestors()]
        )

    def test_no_infinite_metaclass_loop(self):
        klass = builder.extract_node(
            """
            class SSS(object):

                class JJJ(object):
                    pass

                @classmethod
                def Init(cls):
                    cls.JJJ = type('JJJ', (cls.JJJ,), {})

            class AAA(SSS):
                pass

            class BBB(AAA.JJJ):
                pass
        """
        )
        self.assertFalse(scoped_nodes._is_metaclass(klass))
        ancestors = [base.name for base in klass.ancestors()]
        self.assertIn("object", ancestors)
        self.assertIn("JJJ", ancestors)

    def test_no_infinite_metaclass_loop_with_redefine(self):
        ast_nodes = builder.extract_node(
            """
            import datetime

            class A(datetime.date): #@
                @classmethod
                def now(cls):
                    return cls()

            class B(datetime.date): #@
                pass

            datetime.date = A
            datetime.date = B
        """
        )
        for klass in ast_nodes:
            self.assertEqual(None, klass.metaclass())

    @unittest.skipUnless(HAS_SIX, "These tests require the six library")
    def test_metaclass_generator_hack(self):
        klass = builder.extract_node(
            """
            import six

            class WithMeta(six.with_metaclass(type, object)): #@
                pass
        """
        )
        self.assertEqual(["object"], [base.name for base in klass.ancestors()])
        self.assertEqual("type", klass.metaclass().name)

    def test_add_metaclass(self):
        klass = builder.extract_node(
            """
        import abc

        class WithMeta(object, metaclass=abc.ABCMeta):
            pass
        """
        )
        inferred = next(klass.infer())
        metaclass = inferred.metaclass()
        self.assertIsInstance(metaclass, scoped_nodes.ClassDef)
        self.assertIn(metaclass.qname(), ("abc.ABCMeta", "_py_abc.ABCMeta"))

    @unittest.skipUnless(HAS_SIX, "These tests require the six library")
    def test_using_invalid_six_add_metaclass_call(self):
        klass = builder.extract_node(
            """
        import six
        @six.add_metaclass()
        class Invalid(object):
            pass
        """
        )
        inferred = next(klass.infer())
        self.assertIsNone(inferred.metaclass())

    def test_nonregr_infer_callresult(self):
        astroid = builder.parse(
            """
            class Delegate(object):
                def __get__(self, obj, cls):
                    return getattr(obj._subject, self.attribute)

            class CompositeBuilder(object):
                __call__ = Delegate()

            builder = CompositeBuilder(result, composite)
            tgts = builder()
        """
        )
        instance = astroid["tgts"]
        # used to raise "'_Yes' object is not iterable", see
        # https://bitbucket.org/logilab/astroid/issue/17
        self.assertEqual(list(instance.infer()), [util.Uninferable])

    def test_slots(self):
        astroid = builder.parse(
            """
            from collections import deque
            from textwrap import dedent

            class First(object): #@
                __slots__ = ("a", "b", 1)
            class Second(object): #@
                __slots__ = "a"
            class Third(object): #@
                __slots__ = deque(["a", "b", "c"])
            class Fourth(object): #@
                __slots__ = {"a": "a", "b": "b"}
            class Fifth(object): #@
                __slots__ = list
            class Sixth(object): #@
                __slots__ = ""
            class Seventh(object): #@
                __slots__ = dedent.__name__
            class Eight(object): #@
                __slots__ = ("parens")
            class Ninth(object): #@
                pass
            class Ten(object): #@
                __slots__ = dict({"a": "b", "c": "d"})
        """
        )
        expected = [
            ("First", ("a", "b")),
            ("Second", ("a",)),
            ("Third", None),
            ("Fourth", ("a", "b")),
            ("Fifth", None),
            ("Sixth", None),
            ("Seventh", ("dedent",)),
            ("Eight", ("parens",)),
            ("Ninth", None),
            ("Ten", ("a", "c")),
        ]
        for cls, expected_value in expected:
            slots = astroid[cls].slots()
            if expected_value is None:
                self.assertIsNone(slots)
            else:
                self.assertEqual(list(expected_value), [node.value for node in slots])

    def test_slots_for_dict_keys(self):
        module = builder.parse(
            """
        class Issue(object):
          SlotDefaults = {'id': 0, 'id1':1}
          __slots__ = SlotDefaults.keys()
        """
        )
        cls = module["Issue"]
        slots = cls.slots()
        self.assertEqual(len(slots), 2)
        self.assertEqual(slots[0].value, "id")
        self.assertEqual(slots[1].value, "id1")

    def test_slots_empty_list_of_slots(self):
        module = builder.parse(
            """
        class Klass(object):
            __slots__ = ()
        """
        )
        cls = module["Klass"]
        self.assertEqual(cls.slots(), [])

    def test_slots_taken_from_parents(self):
        module = builder.parse(
            """
        class FirstParent(object):
            __slots__ = ('a', 'b', 'c')
        class SecondParent(FirstParent):
            __slots__ = ('d', 'e')
        class Third(SecondParent):
            __slots__ = ('d', )
        """
        )
        cls = module["Third"]
        slots = cls.slots()
        self.assertEqual(
            sorted({slot.value for slot in slots}), ["a", "b", "c", "d", "e"]
        )

    def test_all_ancestors_need_slots(self):
        module = builder.parse(
            """
        class A(object):
            __slots__ = ('a', )
        class B(A): pass
        class C(B):
            __slots__ = ('a', )
        """
        )
        cls = module["C"]
        self.assertIsNone(cls.slots())
        cls = module["B"]
        self.assertIsNone(cls.slots())

    def test_slots_added_dynamically_still_inferred(self):
        code = """
        class NodeBase(object):
            __slots__ = "a", "b"

            if Options.isFullCompat():
                __slots__ += ("c",)

        """
        node = builder.extract_node(code)
        inferred = next(node.infer())
        slots = inferred.slots()
        assert len(slots) == 3, slots
        assert [slot.value for slot in slots] == ["a", "b", "c"]

    def assertEqualMro(self, klass, expected_mro):
        self.assertEqual([member.name for member in klass.mro()], expected_mro)

    def assertEqualMroQName(self, klass, expected_mro):
        self.assertEqual([member.qname() for member in klass.mro()], expected_mro)

    @unittest.skipUnless(HAS_SIX, "These tests require the six library")
    def test_with_metaclass_mro(self):
        astroid = builder.parse(
            """
        import six

        class C(object):
            pass
        class B(C):
            pass
        class A(six.with_metaclass(type, B)):
            pass
        """
        )
        self.assertEqualMro(astroid["A"], ["A", "B", "C", "object"])

    def test_mro(self):
        astroid = builder.parse(
            """
        class C(object): pass
        class D(dict, C): pass

        class A1(object): pass
        class B1(A1): pass
        class C1(A1): pass
        class D1(B1, C1): pass
        class E1(C1, B1): pass
        class F1(D1, E1): pass
        class G1(E1, D1): pass

        class Boat(object): pass
        class DayBoat(Boat): pass
        class WheelBoat(Boat): pass
        class EngineLess(DayBoat): pass
        class SmallMultihull(DayBoat): pass
        class PedalWheelBoat(EngineLess, WheelBoat): pass
        class SmallCatamaran(SmallMultihull): pass
        class Pedalo(PedalWheelBoat, SmallCatamaran): pass

        class OuterA(object):
            class Inner(object):
                pass
        class OuterB(OuterA):
            class Inner(OuterA.Inner):
                pass
        class OuterC(OuterA):
            class Inner(OuterA.Inner):
                pass
        class OuterD(OuterC):
            class Inner(OuterC.Inner, OuterB.Inner):
                pass
        class Duplicates(str, str): pass

        """
        )
        self.assertEqualMro(astroid["D"], ["D", "dict", "C", "object"])
        self.assertEqualMro(astroid["D1"], ["D1", "B1", "C1", "A1", "object"])
        self.assertEqualMro(astroid["E1"], ["E1", "C1", "B1", "A1", "object"])
        with self.assertRaises(InconsistentMroError) as cm:
            astroid["F1"].mro()
        A1 = astroid.getattr("A1")[0]
        B1 = astroid.getattr("B1")[0]
        C1 = astroid.getattr("C1")[0]
        object_ = builder.MANAGER.astroid_cache[BUILTINS].getattr("object")[0]
        self.assertEqual(
            cm.exception.mros, [[B1, C1, A1, object_], [C1, B1, A1, object_]]
        )
        with self.assertRaises(InconsistentMroError) as cm:
            astroid["G1"].mro()
        self.assertEqual(
            cm.exception.mros, [[C1, B1, A1, object_], [B1, C1, A1, object_]]
        )
        self.assertEqualMro(
            astroid["PedalWheelBoat"],
            ["PedalWheelBoat", "EngineLess", "DayBoat", "WheelBoat", "Boat", "object"],
        )

        self.assertEqualMro(
            astroid["SmallCatamaran"],
            ["SmallCatamaran", "SmallMultihull", "DayBoat", "Boat", "object"],
        )

        self.assertEqualMro(
            astroid["Pedalo"],
            [
                "Pedalo",
                "PedalWheelBoat",
                "EngineLess",
                "SmallCatamaran",
                "SmallMultihull",
                "DayBoat",
                "WheelBoat",
                "Boat",
                "object",
            ],
        )

        self.assertEqualMro(
            astroid["OuterD"]["Inner"], ["Inner", "Inner", "Inner", "Inner", "object"]
        )

        with self.assertRaises(DuplicateBasesError) as cm:
            astroid["Duplicates"].mro()
        Duplicates = astroid.getattr("Duplicates")[0]
        self.assertEqual(cm.exception.cls, Duplicates)
        self.assertIsInstance(cm.exception, MroError)
        self.assertIsInstance(cm.exception, ResolveError)

    def test_mro_with_factories(self):
        cls = builder.extract_node(
            """
        def MixinFactory(cls):
            mixin_name = '{}Mixin'.format(cls.__name__)
            mixin_bases = (object,)
            mixin_attrs = {}
            mixin = type(mixin_name, mixin_bases, mixin_attrs)
            return mixin
        class MixinA(MixinFactory(int)):
            pass
        class MixinB(MixinFactory(str)):
            pass
        class Base(object):
            pass
        class ClassA(MixinA, Base):
            pass
        class ClassB(MixinB, ClassA):
            pass
        class FinalClass(ClassB):
            def __init__(self):
                self.name = 'x'
        """
        )
        self.assertEqualMro(
            cls,
            [
                "FinalClass",
                "ClassB",
                "MixinB",
                "",
                "ClassA",
                "MixinA",
                "",
                "Base",
                "object",
            ],
        )

    def test_mro_with_attribute_classes(self):
        cls = builder.extract_node(
            """
        class A:
            pass
        class B:
            pass
        scope = object()
        scope.A = A
        scope.B = B
        class C(scope.A, scope.B):
            pass
        """
        )
        self.assertEqualMro(cls, ["C", "A", "B", "object"])

    @test_utils.require_version(minver="3.7")
    def test_mro_generic_1(self):
        cls = builder.extract_node(
            """
        import typing
        T = typing.TypeVar('T')
        class A(typing.Generic[T]): ...
        class B: ...
        class C(A[T], B): ...
        """
        )
        self.assertEqualMroQName(
            cls, [".C", ".A", "typing.Generic", ".B", "builtins.object"]
        )

    @test_utils.require_version(minver="3.7")
    def test_mro_generic_2(self):
        cls = builder.extract_node(
            """
        from typing import Generic, TypeVar
        T = TypeVar('T')
        class A: ...
        class B(Generic[T]): ...
        class C(Generic[T], A, B[T]): ...
        """
        )
        self.assertEqualMroQName(
            cls, [".C", ".A", ".B", "typing.Generic", "builtins.object"]
        )

    @test_utils.require_version(minver="3.7")
    def test_mro_generic_3(self):
        cls = builder.extract_node(
            """
        from typing import Generic, TypeVar
        T = TypeVar('T')
        class A: ...
        class B(A, Generic[T]): ...
        class C(Generic[T]): ...
        class D(B[T], C[T], Generic[T]): ...
        """
        )
        self.assertEqualMroQName(
            cls, [".D", ".B", ".A", ".C", "typing.Generic", "builtins.object"]
        )

    @test_utils.require_version(minver="3.7")
    def test_mro_generic_4(self):
        cls = builder.extract_node(
            """
        from typing import Generic, TypeVar
        T = TypeVar('T')
        class A: ...
        class B(Generic[T]): ...
        class C(A, Generic[T], B[T]): ...
        """
        )
        self.assertEqualMroQName(
            cls, [".C", ".A", ".B", "typing.Generic", "builtins.object"]
        )

    @test_utils.require_version(minver="3.7")
    def test_mro_generic_5(self):
        cls = builder.extract_node(
            """
        from typing import Generic, TypeVar
        T1 = TypeVar('T1')
        T2 = TypeVar('T2')
        class A(Generic[T1]): ...
        class B(Generic[T2]): ...
        class C(A[T1], B[T2]): ...
        """
        )
        self.assertEqualMroQName(
            cls, [".C", ".A", ".B", "typing.Generic", "builtins.object"]
        )

    @test_utils.require_version(minver="3.7")
    def test_mro_generic_6(self):
        cls = builder.extract_node(
            """
        from typing import Generic as TGeneric, TypeVar
        T = TypeVar('T')
        class Generic: ...
        class A(Generic): ...
        class B(TGeneric[T]): ...
        class C(A, B[T]): ...
        """
        )
        self.assertEqualMroQName(
            cls, [".C", ".A", ".Generic", ".B", "typing.Generic", "builtins.object"]
        )

    @test_utils.require_version(minver="3.7")
    def test_mro_generic_7(self):
        cls = builder.extract_node(
            """
        from typing import Generic, TypeVar
        T = TypeVar('T')
        class A(): ...
        class B(Generic[T]): ...
        class C(A, B[T]): ...
        class D: ...
        class E(C[str], D): ...
        """
        )
        self.assertEqualMroQName(
            cls, [".E", ".C", ".A", ".B", "typing.Generic", ".D", "builtins.object"]
        )

    @test_utils.require_version(minver="3.7")
    def test_mro_generic_error_1(self):
        cls = builder.extract_node(
            """
        from typing import Generic, TypeVar
        T1 = TypeVar('T1')
        T2 = TypeVar('T2')
        class A(Generic[T1], Generic[T2]): ...
        """
        )
        with self.assertRaises(DuplicateBasesError):
            cls.mro()

    @test_utils.require_version(minver="3.7")
    def test_mro_generic_error_2(self):
        cls = builder.extract_node(
            """
        from typing import Generic, TypeVar
        T = TypeVar('T')
        class A(Generic[T]): ...
        class B(A[T], A[T]): ...
        """
        )
        with self.assertRaises(DuplicateBasesError):
            cls.mro()

    def test_generator_from_infer_call_result_parent(self):
        func = builder.extract_node(
            """
        import contextlib

        @contextlib.contextmanager
        def test(): #@
            yield
        """
        )
        result = next(func.infer_call_result())
        self.assertIsInstance(result, Generator)
        self.assertEqual(result.parent, func)

    def test_type_three_arguments(self):
        classes = builder.extract_node(
            """
        type('A', (object, ), {"a": 1, "b": 2, missing: 3}) #@
        """
        )
        first = next(classes.infer())
        self.assertIsInstance(first, nodes.ClassDef)
        self.assertEqual(first.name, "A")
        self.assertEqual(first.basenames, ["object"])
        self.assertIsInstance(first["a"], nodes.Const)
        self.assertEqual(first["a"].value, 1)
        self.assertIsInstance(first["b"], nodes.Const)
        self.assertEqual(first["b"].value, 2)
        with self.assertRaises(AttributeInferenceError):
            first.getattr("missing")

    def test_implicit_metaclass(self):
        cls = builder.extract_node(
            """
        class A(object):
            pass
        """
        )
        type_cls = scoped_nodes.builtin_lookup("type")[1][0]
        self.assertEqual(cls.implicit_metaclass(), type_cls)

    def test_implicit_metaclass_lookup(self):
        cls = builder.extract_node(
            """
        class A(object):
            pass
        """
        )
        instance = cls.instantiate_class()
        func = cls.getattr("mro")
        self.assertEqual(len(func), 1)
        self.assertRaises(AttributeInferenceError, instance.getattr, "mro")

    def test_metaclass_lookup_using_same_class(self):
        # Check that we don't have recursive attribute access for metaclass
        cls = builder.extract_node(
            """
        class A(object): pass
        """
        )
        self.assertEqual(len(cls.getattr("mro")), 1)

    def test_metaclass_lookup_inference_errors(self):
        module = builder.parse(
            """
        class Metaclass(type):
            foo = lala

        class B(object, metaclass=Metaclass): pass
        """
        )
        cls = module["B"]
        self.assertEqual(util.Uninferable, next(cls.igetattr("foo")))

    def test_metaclass_lookup(self):
        module = builder.parse(
            """
        class Metaclass(type):
            foo = 42
            @classmethod
            def class_method(cls):
                pass
            def normal_method(cls):
                pass
            @property
            def meta_property(cls):
                return 42
            @staticmethod
            def static():
                pass

        class A(object, metaclass=Metaclass):
            pass
        """
        )
        acls = module["A"]
        normal_attr = next(acls.igetattr("foo"))
        self.assertIsInstance(normal_attr, nodes.Const)
        self.assertEqual(normal_attr.value, 42)

        class_method = next(acls.igetattr("class_method"))
        self.assertIsInstance(class_method, BoundMethod)
        self.assertEqual(class_method.bound, module["Metaclass"])

        normal_method = next(acls.igetattr("normal_method"))
        self.assertIsInstance(normal_method, BoundMethod)
        self.assertEqual(normal_method.bound, module["A"])

        # Attribute access for properties:
        #   from the metaclass is a property object
        #   from the class that uses the metaclass, the value
        #   of the property
        property_meta = next(module["Metaclass"].igetattr("meta_property"))
        self.assertIsInstance(property_meta, objects.Property)
        wrapping = scoped_nodes.get_wrapping_class(property_meta)
        self.assertEqual(wrapping, module["Metaclass"])

        property_class = next(acls.igetattr("meta_property"))
        self.assertIsInstance(property_class, nodes.Const)
        self.assertEqual(property_class.value, 42)

        static = next(acls.igetattr("static"))
        self.assertIsInstance(static, scoped_nodes.FunctionDef)

    def test_local_attr_invalid_mro(self):
        cls = builder.extract_node(
            """
        # A has an invalid MRO, local_attr should fallback
        # to using .ancestors.
        class A(object, object):
            test = 42
        class B(A): #@
            pass
        """
        )
        local = cls.local_attr("test")[0]
        inferred = next(local.infer())
        self.assertIsInstance(inferred, nodes.Const)
        self.assertEqual(inferred.value, 42)

    def test_has_dynamic_getattr(self):
        module = builder.parse(
            """
        class Getattr(object):
            def __getattr__(self, attrname):
                pass

        class Getattribute(object):
            def __getattribute__(self, attrname):
                pass

        class ParentGetattr(Getattr):
            pass
        """
        )
        self.assertTrue(module["Getattr"].has_dynamic_getattr())
        self.assertTrue(module["Getattribute"].has_dynamic_getattr())
        self.assertTrue(module["ParentGetattr"].has_dynamic_getattr())

        # Test that objects analyzed through the live introspection
        # aren't considered to have dynamic getattr implemented.
        astroid_builder = builder.AstroidBuilder()
        module = astroid_builder.module_build(datetime)
        self.assertFalse(module["timedelta"].has_dynamic_getattr())

    def test_duplicate_bases_namedtuple(self):
        module = builder.parse(
            """
        import collections
        _A = collections.namedtuple('A', 'a')

        class A(_A): pass

        class B(A): pass
        """
        )
        names = ["B", "A", "A", "tuple", "object"]
        mro = module["B"].mro()
        class_names = [i.name for i in mro]
        self.assertEqual(names, class_names)

    def test_instance_bound_method_lambdas(self):
        ast_nodes = builder.extract_node(
            """
        class Test(object): #@
            lam = lambda self: self
            not_method = lambda xargs: xargs
        Test() #@
        """
        )
        cls = next(ast_nodes[0].infer())
        self.assertIsInstance(next(cls.igetattr("lam")), scoped_nodes.Lambda)
        self.assertIsInstance(next(cls.igetattr("not_method")), scoped_nodes.Lambda)

        instance = next(ast_nodes[1].infer())
        lam = next(instance.igetattr("lam"))
        self.assertIsInstance(lam, BoundMethod)
        not_method = next(instance.igetattr("not_method"))
        self.assertIsInstance(not_method, scoped_nodes.Lambda)

    def test_instance_bound_method_lambdas_2(self):
        """
        Test the fact that a method which is a lambda built from
        a factory is well inferred as a bound method (bug pylint 2594)
        """
        ast_nodes = builder.extract_node(
            """
        def lambda_factory():
            return lambda self: print("Hello world")

        class MyClass(object): #@
            f2 = lambda_factory()

        MyClass() #@
        """
        )
        cls = next(ast_nodes[0].infer())
        self.assertIsInstance(next(cls.igetattr("f2")), scoped_nodes.Lambda)

        instance = next(ast_nodes[1].infer())
        f2 = next(instance.igetattr("f2"))
        self.assertIsInstance(f2, BoundMethod)

    def test_class_extra_decorators_frame_is_not_class(self):
        ast_node = builder.extract_node(
            """
        def ala():
            def bala(): #@
                func = 42
        """
        )
        self.assertEqual(ast_node.extra_decorators, [])

    def test_class_extra_decorators_only_callfunc_are_considered(self):
        ast_node = builder.extract_node(
            """
        class Ala(object):
             def func(self): #@
                 pass
             func = 42
        """
        )
        self.assertEqual(ast_node.extra_decorators, [])

    def test_class_extra_decorators_only_assignment_names_are_considered(self):
        ast_node = builder.extract_node(
            """
        class Ala(object):
             def func(self): #@
                 pass
             def __init__(self):
                 self.func = staticmethod(func)

        """
        )
        self.assertEqual(ast_node.extra_decorators, [])

    def test_class_extra_decorators_only_same_name_considered(self):
        ast_node = builder.extract_node(
            """
        class Ala(object):
             def func(self): #@
                pass
             bala = staticmethod(func)
        """
        )
        self.assertEqual(ast_node.extra_decorators, [])
        self.assertEqual(ast_node.type, "method")

    def test_class_extra_decorators(self):
        static_method, clsmethod = builder.extract_node(
            """
        class Ala(object):
             def static(self): #@
                 pass
             def class_method(self): #@
                 pass
             class_method = classmethod(class_method)
             static = staticmethod(static)
        """
        )
        self.assertEqual(len(clsmethod.extra_decorators), 1)
        self.assertEqual(clsmethod.type, "classmethod")
        self.assertEqual(len(static_method.extra_decorators), 1)
        self.assertEqual(static_method.type, "staticmethod")

    def test_extra_decorators_only_class_level_assignments(self):
        node = builder.extract_node(
            """
        def _bind(arg):
            return arg.bind

        class A(object):
            @property
            def bind(self):
                return 42
            def irelevant(self):
                # This is important, because it used to trigger
                # a maximum recursion error.
                bind = _bind(self)
                return bind
        A() #@
        """
        )
        inferred = next(node.infer())
        bind = next(inferred.igetattr("bind"))
        self.assertIsInstance(bind, nodes.Const)
        self.assertEqual(bind.value, 42)
        parent = bind.scope()
        self.assertEqual(len(parent.extra_decorators), 0)

    def test_class_keywords(self):
        data = """
            class TestKlass(object, metaclass=TestMetaKlass,
                    foo=42, bar='baz'):
                pass
        """
        astroid = builder.parse(data, __name__)
        cls = astroid["TestKlass"]
        self.assertEqual(len(cls.keywords), 2)
        self.assertEqual([x.arg for x in cls.keywords], ["foo", "bar"])
        children = list(cls.get_children())
        assert len(children) == 4
        assert isinstance(children[1], nodes.Keyword)
        assert isinstance(children[2], nodes.Keyword)
        assert children[1].arg == "foo"
        assert children[2].arg == "bar"

    def test_kite_graph(self):
        data = """
        A = type('A', (object,), {})

        class B1(A): pass

        class B2(A): pass

        class C(B1, B2): pass

        class D(C):
            def update(self):
                self.hello = 'hello'
        """
        # Should not crash
        builder.parse(data)


def test_metaclass_cannot_infer_call_yields_an_instance():
    node = builder.extract_node(
        """
    from undefined import Undefined
    class Meta(type):
        __call__ = Undefined
    class A(metaclass=Meta):
        pass
    A()
    """
    )
    inferred = next(node.infer())
    assert isinstance(inferred, Instance)


@pytest.mark.parametrize(
    "func",
    [
        textwrap.dedent(
            """
    def func(a, b, /, d, e):
        pass
    """
        ),
        textwrap.dedent(
            """
    def func(a, b=None, /, d=None, e=None):
        pass
    """
        ),
        textwrap.dedent(
            """
    def func(a, other, other, b=None, /, d=None, e=None):
        pass
    """
        ),
        textwrap.dedent(
            """
    def func(a, other, other, b=None, /, d=None, e=None, **kwargs):
        pass
    """
        ),
        textwrap.dedent(
            """
    def name(p1, p2, /, p_or_kw, *, kw):
        pass
    """
        ),
        textwrap.dedent(
            """
    def __init__(self, other=(), /, **kw):
        pass
    """
        ),
        textwrap.dedent(
            """
    def __init__(self: int, other: float, /, **kw):
        pass
    """
        ),
    ],
)
@test_utils.require_version("3.8")
def test_posonlyargs_python_38(func):
    ast_node = builder.extract_node(func)
    assert ast_node.as_string().strip() == func.strip()


@test_utils.require_version("3.8")
def test_posonlyargs_default_value():
    ast_node = builder.extract_node(
        """
    def func(a, b=1, /, c=2): pass
    """
    )
    last_param = ast_node.args.default_value("c")
    assert isinstance(last_param, nodes.Const)
    assert last_param.value == 2

    first_param = ast_node.args.default_value("b")
    assert isinstance(first_param, nodes.Const)
    assert first_param.value == 1


if __name__ == "__main__":
    unittest.main()