Improve coverage of ``argparse`` (#6332)

* Fix coverage of ``pylint/config/config_file_parser.py``
* Fix coverage of ``pylint/config/argument.py``

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/config/test_find_default_config_files.py b/tests/config/test_find_default_config_files.py
index 7d25b4e8b..373099f08 100644
--- a/tests/config/test_find_default_config_files.py
+++ b/tests/config/test_find_default_config_files.py
@@ -14,9 +14,11 @@ from collections.abc import Iterator
 from pathlib import Path
 
 import pytest
+from pytest import CaptureFixture
 
 from pylint import config, testutils
 from pylint.config.find_default_config_files import _cfg_has_config, _toml_has_config
+from pylint.lint.run import Run
 
 
 @pytest.fixture
@@ -143,6 +145,20 @@ def test_pylintrc_parentdir_no_package() -> None:
                 assert next(config.find_default_config_files(), None) == expected
 
 
+@pytest.mark.usefixtures("pop_pylintrc")
+def test_verbose_output_no_config(capsys: CaptureFixture) -> None:
+    """Test that we print a log message in verbose mode with no file."""
+    with tempdir() as chroot:
+        with fake_home():
+            chroot_path = Path(chroot)
+            testutils.create_files(["a/b/c/d/__init__.py"])
+            os.chdir(chroot_path / "a/b/c")
+            with pytest.raises(SystemExit):
+                Run(["--verbose"])
+            out = capsys.readouterr()
+            assert "No config file found, using default configuration" in out.err
+
+
 @pytest.mark.parametrize(
     "content,expected",
     [