tests/unittest_raw_building.py

# Copyright (c) 2013 AndroWiiid <androwiiid@gmail.com>
# Copyright (c) 2014-2016, 2018-2020 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2014 Google, Inc.
# Copyright (c) 2015-2016 Ceridwen <ceridwenv@gmail.com>
# Copyright (c) 2018 Anthony Sottile <asottile@umich.edu>
# Copyright (c) 2018 Bryce Guinta <bryce.paul.guinta@gmail.com>
# Copyright (c) 2019 Ashley Whetter <ashley@awhetter.co.uk>
# Copyright (c) 2020-2021 hippo91 <guillaume.peillex@gmail.com>
# Copyright (c) 2020 David Gilman <davidgilman1@gmail.com>
# Copyright (c) 2021 Pierre Sassoulas <pierre.sassoulas@gmail.com>
# Copyright (c) 2021 Marc Mueller <30130371+cdce8p@users.noreply.github.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/main/LICENSE

import platform
import unittest

import _io

from astroid.builder import AstroidBuilder
from astroid.raw_building import (
    attach_dummy_node,
    build_class,
    build_from_import,
    build_function,
    build_module,
)


class RawBuildingTC(unittest.TestCase):
    def test_attach_dummy_node(self) -> None:
        node = build_module("MyModule")
        attach_dummy_node(node, "DummyNode")
        self.assertEqual(1, len(list(node.get_children())))

    def test_build_module(self) -> None:
        node = build_module("MyModule")
        self.assertEqual(node.name, "MyModule")
        self.assertEqual(node.pure_python, False)
        self.assertEqual(node.package, False)
        self.assertEqual(node.parent, None)

    def test_build_class(self) -> None:
        node = build_class("MyClass")
        self.assertEqual(node.name, "MyClass")
        self.assertEqual(node.doc, None)

    def test_build_function(self) -> None:
        node = build_function("MyFunction")
        self.assertEqual(node.name, "MyFunction")
        self.assertEqual(node.doc, None)

    def test_build_function_args(self) -> None:
        args = ["myArgs1", "myArgs2"]
        node = build_function("MyFunction", args)
        self.assertEqual("myArgs1", node.args.args[0].name)
        self.assertEqual("myArgs2", node.args.args[1].name)
        self.assertEqual(2, len(node.args.args))

    def test_build_function_defaults(self) -> None:
        defaults = ["defaults1", "defaults2"]
        node = build_function(name="MyFunction", args=None, defaults=defaults)
        self.assertEqual(2, len(node.args.defaults))

    def test_build_function_posonlyargs(self) -> None:
        node = build_function(name="MyFunction", posonlyargs=["a", "b"])
        self.assertEqual(2, len(node.args.posonlyargs))

    def test_build_function_kwonlyargs(self) -> None:
        node = build_function(name="MyFunction", kwonlyargs=["a", "b"])
        assert len(node.args.kwonlyargs) == 2
        assert node.args.kwonlyargs[0].name == "a"
        assert node.args.kwonlyargs[1].name == "b"

    def test_build_from_import(self) -> None:
        names = ["exceptions, inference, inspector"]
        node = build_from_import("astroid", names)
        self.assertEqual(len(names), len(node.names))

    @unittest.skipIf(platform.python_implementation() == "PyPy", "Only affects CPython")
    def test_io_is__io(self):
        # _io module calls itself io. This leads
        # to cyclic dependencies when astroid tries to resolve
        # what io.BufferedReader is. The code that handles this
        # is in astroid.raw_building.imported_member, which verifies
        # the true name of the module.
        builder = AstroidBuilder()
        module = builder.inspect_build(_io)
        buffered_reader = module.getattr("BufferedReader")[0]
        self.assertEqual(buffered_reader.root().name, "io")


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