Add test and improve docs

doc/en/reference/reference.rst

@@ -1151,9 +1151,10 @@ Consult the :ref:`internal-warnings` section in the documentation for more infor
 Configuration Options
 ---------------------
 
-Here is a list of builtin configuration options that may be written in a ``pytest.ini``, ``pyproject.toml``, ``tox.ini`` or ``setup.cfg``
+Here is a list of builtin configuration options that may be written in a ``pytest.ini`` (or ``.pytest.ini``),
-file, usually located at the root of your repository. To see each file format in details, see
+``pyproject.toml``, ``tox.ini``, or ``setup.cfg`` file, usually located at the root of your repository.
-:ref:`config file formats`.
+
+To see each file format in details, see :ref:`config file formats`.
 
 .. warning::
     Usage of ``setup.cfg`` is not recommended except for very simple use cases. ``.cfg``

testing/test_config.py

@@ -112,21 +112,26 @@ class TestParseIni:
 
     @pytest.mark.parametrize(
         "section, name",
-        [("tool:pytest", "setup.cfg"), ("pytest", "tox.ini"), ("pytest", "pytest.ini")],
+        [
+            ("tool:pytest", "setup.cfg"),
+            ("pytest", "tox.ini"),
+            ("pytest", "pytest.ini"),
+            ("pytest", ".pytest.ini"),
+        ],
     )
     def test_ini_names(self, pytester: Pytester, name, section) -> None:
         pytester.path.joinpath(name).write_text(
             textwrap.dedent(
                 """
             [{section}]
-            minversion = 1.0
+            minversion = 3.36
         """.format(
                     section=section
                 )
             )
         )
         config = pytester.parseconfig()
-        assert config.getini("minversion") == "1.0"
+        assert config.getini("minversion") == "3.36"
 
     def test_pyproject_toml(self, pytester: Pytester) -> None:
         pytester.makepyprojecttoml(