Add test_report_builtins_internals_keys

Author: rwgk

tests/test_gil_scoped.py

@@ -1,9 +1,21 @@
+import builtins
 import multiprocessing
 import threading
 
+import pytest
+
 from pybind11_tests import gil_scoped as m
 
 
+def get_pybind11_internals_keys():
+    keys = []
+    for key in sorted(dir(builtins)):
+        if key.startswith("__pybind11_internals_"):
+            assert key.endswith("__")
+            keys.append(key)
+    return tuple(keys)
+
+
 def _run_in_process(target, *args, **kwargs):
     """Runs target in process and returns its exitcode after 10s (None if still alive)."""
     process = multiprocessing.Process(target=target, args=args, kwargs=kwargs)
@@ -110,6 +122,14 @@ def test_cross_module_gil_acquired():
     m.test_cross_module_gil_acquired()  # Should not raise a SIGSEGV
 
 
+def test_report_builtins_internals_keys():
+    """For reporting, not an actual test."""
+    m.test_cross_module_gil_released()  # Any test that imports cross_module_gil_utils
+    keys = get_pybind11_internals_keys()
+    assert len(keys) != 0
+    pytest.skip("builtins internals keys: %s" % ", ".join(keys))
+
+
 def test_cross_module_gil_inner_custom_released():
     """Makes sure that the GIL can be acquired/released by another module
     from a GIL-released state using custom locking logic."""