Fix a bug where a tox.ini file with pylint configuration was igno…

…red and it exists in the current directory.

Closes pylint-dev#9727

doc/whatsnew/fragments/9727.bugfix

@@ -0,0 +1,3 @@
+Fix a bug where a ``tox.ini`` file with pylint configuration was ignored and it exists in the current directory.
+
+Closes #9727

pylint/config/find_default_config_files.py

@@ -22,7 +22,8 @@
     Path(".pylintrc.toml"),
 )
 PYPROJECT_NAME = Path("pyproject.toml")
-CONFIG_NAMES = (*RC_NAMES, PYPROJECT_NAME, Path("setup.cfg"))
+TOX_NAME = Path("tox.ini")
+CONFIG_NAMES = (*RC_NAMES, PYPROJECT_NAME, Path("setup.cfg"), TOX_NAME)
 
 
 def _find_pyproject() -> Path:
@@ -71,7 +72,7 @@ def _yield_default_files() -> Iterator[Path]:
             if config_name.is_file():
                 if config_name.suffix == ".toml" and not _toml_has_config(config_name):
                     continue
-                if config_name.suffix == ".cfg" and not _cfg_has_config(config_name):
+                if config_name.suffix in (".cfg", ".ini") and not _cfg_has_config(config_name):
                     continue
 
                 yield config_name.resolve()

tests/config/test_find_default_config_files.py

@@ -307,13 +307,18 @@ def test_toml_has_config(content: str, expected: bool, tmp_path: Path) -> None:
         ],
     ],
 )
-def test_cfg_has_config(content: str, expected: bool, tmp_path: Path) -> None:
-    """Test that a cfg file has a pylint config."""
+def test_has_config(content: str, expected: bool, tmp_path: Path) -> None:
+    """Test that a .cfg file or .ini file has a pylint config."""
     fake_cfg = tmp_path / "fake.cfg"
     with open(fake_cfg, "w", encoding="utf8") as f:
         f.write(content)
     assert _cfg_has_config(fake_cfg) == expected
 
+    fake_ini = tmp_path / "tox.ini"
+    with open(fake_ini, "w", encoding="utf8") as f:
+        f.write(content)
+    assert _cfg_has_config(fake_ini) == expected
+
 
 def test_non_existent_home() -> None:
     """Test that we handle a non-existent home directory.