Edit

[EDIT] FILE: test_func.py

import csv
import os
import pickle
import sys
from pathlib import Path

import pylint
import pytest

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "pylint_django.tests.settings")

HERE = Path(__file__).parent

try:
    # pylint 2.5: test_functional has been moved to pylint.testutils
    from pylint.testutils import FunctionalTestFile, LintModuleTest, lint_module_test

if "test" not in csv.list_dialects():

class test_dialect(csv.excel):
            delimiter = ":"
            lineterminator = "\n"

csv.register_dialect("test", test_dialect)

lint_module_test.PYLINTRC = HERE / "testing_pylint.rc"
except (ImportError, AttributeError):
    # specify directly the directory containing test_functional.py
    test_functional_dir = os.getenv("PYLINT_TEST_FUNCTIONAL_DIR", "")

# otherwise look for in in ~/pylint/tests - pylint 2.4
    # this is the pylint git checkout dir, not the pylint module dir
    if not os.path.isdir(test_functional_dir):
        test_functional_dir = os.path.join(os.getenv("HOME", "/home/travis"), "pylint", "tests")

# or site-packages/pylint/test/ - pylint before 2.4
    if not os.path.isdir(test_functional_dir):
        test_functional_dir = os.path.join(os.path.dirname(pylint.__file__), "test")

sys.path.append(test_functional_dir)

from test_functional import FunctionalTestFile, LintModuleTest

sys.path += [str(p.absolute()) for p in (HERE, HERE / "../../", HERE / "input")]

class PylintDjangoLintModuleTest(LintModuleTest):
    """
    Only used so that we can load this plugin into the linter!
    """

def __init__(self, test_file):
        # if hasattr(test_file, 'option_file') and test_file.option_file is None:
        super(PylintDjangoLintModuleTest, self).__init__(test_file)
        self._linter.load_plugin_modules(["pylint_django"])
        self._linter.load_plugin_configuration()

class PylintDjangoMigrationsTest(PylintDjangoLintModuleTest):
    """
    Only used so that we can load
    pylint_django.checkers.migrations into the linter!
    """

def __init__(self, test_file):
        super().__init__(test_file)
        self._linter.load_plugin_modules(["pylint_django.checkers.migrations"])
        self._linter.load_plugin_configuration()

def get_tests(input_dir="input", sort=False):
    def _file_name(test):
        return test.base

input_dir = HERE / input_dir

suite = []
    for fname in input_dir.iterdir():
        if fname.name != "__init__.py" and fname.name.endswith(".py"):
            suite.append(FunctionalTestFile(str(input_dir.absolute()), str(fname.absolute())))

# when testing the migrations plugin we need to sort by input file name
    # because the plugin reports the errors in close() which appends them to the
    # report for the last file in the list
    if sort:
        suite.sort(key=_file_name)

return suite

TESTS = get_tests()
TESTS.extend(get_tests("input/models"))
TESTS_NAMES = [t.base for t in TESTS]

@pytest.mark.parametrize("test_file", TESTS, ids=TESTS_NAMES)
def test_everything(test_file):
    # copied from pylint.tests.test_functional.test_functional
    LintTest = PylintDjangoLintModuleTest(test_file)
    LintTest.setUp()
    LintTest._runTest()

# NOTE: define tests for the migrations checker!
MIGRATIONS_TESTS = get_tests("input/migrations", True)
MIGRATIONS_TESTS_NAMES = [t.base for t in MIGRATIONS_TESTS]

@pytest.mark.parametrize("test_file", MIGRATIONS_TESTS, ids=MIGRATIONS_TESTS_NAMES)
def test_migrations_plugin(test_file):
    LintTest = PylintDjangoMigrationsTest(test_file)
    LintTest.setUp()
    LintTest._runTest()

@pytest.mark.parametrize("test_file", MIGRATIONS_TESTS[:1], ids=MIGRATIONS_TESTS_NAMES[:1])
def test_linter_should_be_pickleable_with_pylint_django_plugin_installed(test_file):
    LintTest = PylintDjangoMigrationsTest(test_file)
    LintTest.setUp()

# LintModuleTest sets reporter to instance of FunctionalTestReporter that is not picklable
    LintTest._linter.reporter = None
    pickle.dumps(LintTest._linter)

if __name__ == "__main__":
    sys.exit(pytest.main(sys.argv))

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