move lsof warning to something ignorable and ignore it

pyproject.toml

@@ -403,6 +403,9 @@ filterwarnings = [
     "ignore:VendorImporter\\.find_spec\\(\\) not found; falling back to find_module\\(\\):ImportWarning",
     # https://github.com/pytest-dev/execnet/pull/127
     "ignore:isSet\\(\\) is deprecated, use is_set\\(\\) instead:DeprecationWarning",
+    # https://github.com/pytest-dev/pytest/issues/2366
+    # https://github.com/pytest-dev/pytest/pull/13057
+    "default:.*:pytest.PytestFDWarning",
 ]
 pytester_example_dir = "testing/example_scripts"
 markers = [

src/_pytest/pytester.py

@@ -65,7 +65,7 @@
 from _pytest.reports import CollectReport
 from _pytest.reports import TestReport
 from _pytest.tmpdir import TempPathFactory
-from _pytest.warning_types import PytestWarning
+from _pytest.warning_types import PytestFDWarning
 
 
 if TYPE_CHECKING:
@@ -188,7 +188,7 @@ def pytest_runtest_protocol(self, item: Item) -> Generator[None, object, object]
                     "*** function {}:{}: {} ".format(*item.location),
                     "See issue #2366",
                 ]
-                item.warn(PytestWarning("\n".join(error)))
+                item.warn(PytestFDWarning("\n".join(error)))
 
 
 # used at least by pytest-xdist plugin

src/_pytest/warning_types.py

@@ -123,6 +123,11 @@ def format(self, **kwargs: Any) -> _W:
         return self.category(self.template.format(**kwargs))
 
 
+@final
+class PytestFDWarning(PytestWarning):
+    pass
+
+
 def warn_explicit_for(method: FunctionType, message: PytestWarning) -> None:
     """
     Issue the warning :param:`message` for the definition of the given :param:`method`

src/pytest/__init__.py

@@ -77,6 +77,7 @@
 from _pytest.warning_types import PytestConfigWarning
 from _pytest.warning_types import PytestDeprecationWarning
 from _pytest.warning_types import PytestExperimentalApiWarning
+from _pytest.warning_types import PytestFDWarning
 from _pytest.warning_types import PytestRemovedIn9Warning
 from _pytest.warning_types import PytestUnhandledThreadExceptionWarning
 from _pytest.warning_types import PytestUnknownMarkWarning
@@ -124,6 +125,7 @@
     "PytestConfigWarning",
     "PytestDeprecationWarning",
     "PytestExperimentalApiWarning",
+    "PytestFDWarning",
     "PytestPluginManager",
     "PytestRemovedIn9Warning",
     "PytestUnhandledThreadExceptionWarning",