From 48aa4b3af2394c76c177e90b9332ccdca39605ab Mon Sep 17 00:00:00 2001
From: Franck Charras <29153872+fcharras@users.noreply.github.com>
Date: Tue, 19 Dec 2023 13:47:30 +0100
Subject: [PATCH] Add a non regression test for 9765

---
 testing/test_pluginmanager.py | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/testing/test_pluginmanager.py b/testing/test_pluginmanager.py
index e5773412f..b01d36d1a 100644
--- a/testing/test_pluginmanager.py
+++ b/testing/test_pluginmanager.py
@@ -98,6 +98,37 @@ class TestPytestPluginInteractions:
         config.pluginmanager.register(A())
         assert len(values) == 2
 
+    @pytest.mark.skipif(
+        not sys.platform.startswith("win"),
+        reason="requires a case-insensitive file system",
+    )
+    def test_conftestpath_case_sensitivity(self, pytester: Pytester) -> None:
+        """Non-regression test for https://github.com/pytest-dev/pytest/issues/9765
+
+        Ensures that the conftests are registered in the plugin dictionary with a key
+        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": ""})
+
+        conftest = pytester.path.joinpath("tests/conftest.py")
+        conftest_lower = pytester.path.joinpath("TESTS/CONFTEST.PY")
+
+        mod = config.pluginmanager._importconftest(
+            conftest, importmode="prepend", rootpath=pytester.path
+        )
+
+        # Those two calls should succeed because the conftest should be registered
+        # independently of the casing of conftestpath.
+        assert mod is config.pluginmanager._importconftest(
+            conftest, importmode="prepend", rootpath=pytester.path
+        )
+        assert mod is config.pluginmanager._importconftest(
+            conftest_lower, importmode="prepend", rootpath=pytester.path
+        )
+
     def test_hook_tracing(self, _config_for_test: Config) -> None:
         pytestpm = _config_for_test.pluginmanager  # fully initialized with plugins
         saveindent = []