Fix key formating divergence when inspecting plugin dictionary.

Fix #27806

Co-authored-by: Loïc Estève <[email protected]>

Author: fcharras

src/_pytest/config/__init__.py

@@ -639,7 +639,9 @@ def _rget_with_confmod(
     def _importconftest(
         self, conftestpath: Path, importmode: Union[str, ImportMode], rootpath: Path
     ) -> types.ModuleType:
-        existing = self.get_plugin(str(conftestpath))
+        conftest_registration_name = os.path.normcase(os.path.normpath(conftestpath))
+
+        existing = self.get_plugin(conftest_registration_name)
         if existing is not None:
             return cast(types.ModuleType, existing)
 
@@ -664,7 +666,7 @@ def _importconftest(
                     assert mod not in mods
                     mods.append(mod)
         self.trace(f"loading conftestmodule {mod!r}")
-        self.consider_conftest(mod)
+        self.consider_conftest(mod, name=conftest_registration_name)
         return mod
 
     def _check_non_top_pytest_plugins(
@@ -744,9 +746,9 @@ def consider_pluginarg(self, arg: str) -> None:
                     del self._name2plugin["pytest_" + name]
             self.import_plugin(arg, consider_entry_points=True)
 
-    def consider_conftest(self, conftestmodule: types.ModuleType) -> None:
+    def consider_conftest(self, conftestmodule: types.ModuleType, name: str) -> None:
         """:meta private:"""
-        self.register(conftestmodule, name=conftestmodule.__file__)
+        self.register(conftestmodule, name=name)
 
     def consider_env(self) -> None:
         """:meta private:"""

testing/test_conftest.py

@@ -212,12 +212,12 @@ def test_setinitial_conftest_subdirs(pytester: Pytester, name: str) -> None:
     subconftest.touch()
     pm = PytestPluginManager()
     conftest_setinitial(pm, [sub.parent], confcutdir=pytester.path)
-    key = subconftest.resolve()
+    key = os.path.normcase(os.path.normpath(subconftest.resolve()))
     if name not in ("whatever", ".dotdir"):
-        assert pm.has_plugin(str(key))
+        assert pm.has_plugin(key)
         assert len(set(pm.get_plugins()) - {pm}) == 1
     else:
-        assert not pm.has_plugin(str(key))
+        assert not pm.has_plugin(key)
         assert len(set(pm.get_plugins()) - {pm}) == 0
 
 

testing/test_pluginmanager.py

@@ -368,7 +368,7 @@ 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, name=str(mod.__file__))
 
 
 class TestPytestPluginManagerBootstrapming: