[test] Use an empty pylintrc so tests to not depend on system's conf

Closes #8342, but this does not fix the problem generically, all
tests should run independentely from the system's pylint configuration

tests/checkers/unittest_imports.py

@@ -193,20 +193,23 @@ def test_preferred_module(capsys: CaptureFixture[str]) -> None:
         assert len(errors) == 0
 
     @staticmethod
-    def test_allow_reexport_package(capsys: CaptureFixture[str]) -> None:
+    def test_allow_reexport_package(
+        empty_pylintrc: str, capsys: CaptureFixture[str]
+    ) -> None:
         """Test --allow-reexport-from-package option."""
 
         # Option disabled - useless-import-alias should always be emitted
         Run(
             [
                 f"{os.path.join(REGR_DATA, 'allow_reexport')}",
                 "--allow-reexport-from-package=no",
+                f"--rc-file={empty_pylintrc}",
                 "-sn",
             ],
             exit=False,
         )
         output, errors = capsys.readouterr()
-        assert len(output.split("\n")) == 5, f"Expected 5 line breaks in:{output}"
+        assert len(output.split("\n")) == 7, f"Expected 5 line breaks in:{output}"
         assert (
             "__init__.py:1:0: C0414: Import alias does not rename original package (useless-import-alias)"
             in output

tests/config/pylint_config/test_pylint_config_generate.py

@@ -162,7 +162,7 @@ def test_writing_to_output_file(
 
 
 def test_writing_minimal_file(
-    monkeypatch: MonkeyPatch, capsys: CaptureFixture[str]
+    empty_pylintrc: str, monkeypatch: MonkeyPatch, capsys: CaptureFixture[str]
 ) -> None:
     """Check that we can write a minimal file."""
     # Monkeypatch everything we don't want to check in this test
@@ -181,12 +181,22 @@ def test_writing_minimal_file(
     with warnings.catch_warnings():
         warnings.filterwarnings("ignore", message="NOTE:.*", category=UserWarning)
         # Check not minimal has comments
-        Run(["generate", "--interactive"], exit=False)
+        conf = f"--rc-file={empty_pylintrc}"
+        Run(["generate", "--interactive", conf], exit=False)
         captured = capsys.readouterr()
         assert any(line.startswith("#") for line in captured.out.splitlines())
 
         # Check minimal doesn't have comments and no default values
-        Run(["--accept-no-return-doc=y", "generate", "--interactive"], exit=False)
+        Run(
+            [
+                conf,
+                "--load-plugins=pylint.extensions.docparams",
+                "--accept-no-return-doc=y",
+                "generate",
+                "--interactive",
+            ],
+            exit=False,
+        )
         captured = capsys.readouterr()
         assert not any(i.startswith("#") for i in captured.out.split("\n"))
         assert "accept-no-return-doc" not in captured.out

tests/conftest.py

@@ -22,6 +22,11 @@
 HERE = Path(__file__).parent
 
 
+@pytest.fixture()
+def empty_pylintrc() -> str:
+    return str(HERE / "data/empty_pylintrc")
+
+
 @pytest.fixture()
 def tests_directory() -> Path:
     return HERE