Fix

Author: lesteve

src/_pytest/config/__init__.py

@@ -63,6 +63,7 @@
 from _pytest.pathlib import safe_exists
 from _pytest.stash import Stash
 from _pytest.warning_types import PytestConfigWarning
+from _pytest.warning_types import PytestDeprecationWarning
 from _pytest.warning_types import warn_explicit_for
 
 if TYPE_CHECKING:
@@ -634,10 +635,8 @@ def _rget_with_confmod(
     def _importconftest(
         self, conftestpath: Path, importmode: Union[str, ImportMode], rootpath: Path
     ) -> types.ModuleType:
-        # Avoid inconsistent path issues on Windows, see
-        # https://github.com/pytest-dev/pytest/issues/9765
-        normalized_conftestpath = os.path.normcase(conftestpath)
-        existing = self.get_plugin(normalized_conftestpath)
+        conftestpath_str = str(conftestpath)
+        existing = self.get_plugin(conftestpath_str)
         if existing is not None:
             return cast(types.ModuleType, existing)
 
@@ -662,7 +661,7 @@ def _importconftest(
                     assert mod not in mods
                     mods.append(mod)
         self.trace(f"loading conftestmodule {mod!r}")
-        self.consider_conftest(mod, registration_name=normalized_conftestpath)
+        self.consider_conftest(mod, registration_name=conftestpath_str)
         return mod
 
     def _check_non_top_pytest_plugins(
@@ -743,18 +742,17 @@ def consider_pluginarg(self, arg: str) -> None:
             self.import_plugin(arg, consider_entry_points=True)
 
     def consider_conftest(
-        self, conftestmodule: types.ModuleType, registration_name: str | None = None
+        self, conftestmodule: types.ModuleType, registration_name: Optional[str] = None
     ) -> None:
         """:meta private:"""
         if registration_name is None:
-            # Avoid inconsistent path issues on Windows, see
-            # https://github.com/pytest-dev/pytest/issues/9765
-            registration_name = conftestmodule.__file__
-            registration_name = (
-                registration_name
-                if registration_name is None
-                else os.path.normcase(registration_name)
+            warnings.warn(
+                "'consider_conftest' was called with registration_name=None, this will become an error in the future'",
+                PytestDeprecationWarning,
             )
+            # Keep Pytest < 8 previous behaviour
+            registration_name = conftestmodule.__file__
+
         self.register(conftestmodule, name=registration_name)
 
     def consider_env(self) -> None:

testing/test_pluginmanager.py

@@ -109,7 +109,6 @@ def test_conftestpath_case_sensitivity(self, pytester: Pytester) -> None:
         that does not depend on the case of the input path if the filesystem is
         case-insensitive.
         """
-
         config = pytester.parseconfig()
         pytester.makepyfile(**{"tests/conftest.py": ""})
 
@@ -399,7 +398,7 @@ def test_consider_conftest_deps(
             pytester.makepyfile("pytest_plugins='xyz'"), root=pytester.path
         )
         with pytest.raises(ImportError):
-            pytestpm.consider_conftest(mod)
+            pytestpm.consider_conftest(mod, registration_name="unused")
 
 
 class TestPytestPluginManagerBootstrapming: