tests/test_regr.py

# Copyright (c) 2006-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
# Copyright (c) 2012 FELD Boris <lothiraldan@gmail.com>
# Copyright (c) 2014 Google, Inc.
# Copyright (c) 2014 Arun Persaud <arun@nubati.net>
# Copyright (c) 2015-2020 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2015 Ionel Cristian Maries <contact@ionelmc.ro>
# Copyright (c) 2016-2017 Derek Gustafson <degustaf@gmail.com>
# Copyright (c) 2018 Reverb C <reverbc@users.noreply.github.com>
# Copyright (c) 2019-2021 Pierre Sassoulas <pierre.sassoulas@gmail.com>
# Copyright (c) 2019 Ashley Whetter <ashley@awhetter.co.uk>
# Copyright (c) 2020 hippo91 <guillaume.peillex@gmail.com>
# Copyright (c) 2020 Damien Baty <damien.baty@polyconseil.fr>

# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/master/LICENSE

"""non regression tests for pylint, which requires a too specific configuration
to be incorporated in the automatic functional test framework
"""
# pylint: disable=redefined-outer-name

import os
import sys
from os.path import abspath, dirname, join

import astroid
import pytest

from pylint import testutils

REGR_DATA = join(dirname(abspath(__file__)), "regrtest_data")
sys.path.insert(1, REGR_DATA)


@pytest.fixture(scope="module")
def reporter():
    return testutils.GenericTestReporter


@pytest.fixture(scope="module")
def disable():
    return ["I"]


@pytest.fixture
def finalize_linter(linter):
    """call reporter.finalize() to cleanup
    pending messages if a test finished badly
    """
    yield linter
    linter.reporter.finalize()


def Equals(expected):
    return lambda got: got == expected


@pytest.mark.parametrize(
    "file_name, check",
    [
        ("package.__init__", Equals("")),
        ("precedence_test", Equals("")),
        ("import_package_subpackage_module", Equals("")),
        ("pylint.checkers.__init__", lambda x: "__path__" not in x),
        (join(REGR_DATA, "classdoc_usage.py"), Equals("")),
        (join(REGR_DATA, "module_global.py"), Equals("")),
        (join(REGR_DATA, "decimal_inference.py"), Equals("")),
        (join(REGR_DATA, "absimp", "string.py"), Equals("")),
        (join(REGR_DATA, "bad_package"), lambda x: "Unused import missing" in x),
    ],
)
def test_package(finalize_linter, file_name, check):
    finalize_linter.check(file_name)
    got = finalize_linter.reporter.finalize().strip()
    assert check(got)


@pytest.mark.parametrize(
    "file_name",
    [
        join(REGR_DATA, "import_assign.py"),
        join(REGR_DATA, "special_attr_scope_lookup_crash.py"),
        join(REGR_DATA, "try_finally_disable_msg_crash"),
    ],
)
def test_crash(finalize_linter, file_name):
    finalize_linter.check(file_name)


@pytest.mark.parametrize(
    "fname", [x for x in os.listdir(REGR_DATA) if x.endswith("_crash.py")]
)
def test_descriptor_crash(fname, finalize_linter):
    finalize_linter.check(join(REGR_DATA, fname))
    finalize_linter.reporter.finalize().strip()


@pytest.fixture
def modify_path():
    cwd = os.getcwd()
    sys.path.insert(0, "")
    yield
    sys.path.pop(0)
    os.chdir(cwd)


@pytest.mark.usefixtures("modify_path")
def test_check_package___init__(finalize_linter):
    filename = "package.__init__"
    finalize_linter.check(filename)
    checked = list(finalize_linter.stats["by_module"].keys())
    assert checked == [filename]

    os.chdir(join(REGR_DATA, "package"))
    finalize_linter.check("__init__")
    checked = list(finalize_linter.stats["by_module"].keys())
    assert checked == ["__init__"]


def test_pylint_config_attr():
    mod = astroid.MANAGER.ast_from_module_name("pylint.lint.pylinter")
    pylinter = mod["PyLinter"]
    expect = [
        "OptionsManagerMixIn",
        "object",
        "MessagesHandlerMixIn",
        "ReportsHandlerMixIn",
        "BaseTokenChecker",
        "BaseChecker",
        "OptionsProviderMixIn",
    ]
    assert [c.name for c in pylinter.ancestors()] == expect
    assert list(astroid.Instance(pylinter).getattr("config"))
    inferred = list(astroid.Instance(pylinter).igetattr("config"))
    assert len(inferred) == 1
    assert inferred[0].root().name == "optparse"
    assert inferred[0].name == "Values"