Fix test_frame() on Python 3.13 beta 1 (#98)

Author: vstinner

.github/workflows/build.yml

@@ -29,8 +29,7 @@ jobs:
           - "3.12"
           # CPython 3.13 final is scheduled for October 2024:
           # https://peps.python.org/pep-0719/
-          # TODO: Reenable 3.13 once fixed.
-          #- "3.13"
+          - "3.13"
 
           # PyPy versions:
           # - https://github.com/actions/setup-python/blob/main/docs/advanced-usage.md

tests/test_pythoncapi_compat_cext.c

@@ -255,7 +255,10 @@ test_frame(PyObject *Py_UNUSED(module), PyObject* Py_UNUSED(ignored))
     // test PyFrame_GetLocals()
     PyObject *locals = PyFrame_GetLocals(frame);
     assert(locals != _Py_NULL);
+    // Python 3.13 creates a local proxy
+#if PY_VERSION_HEX < 0x030D0000
     assert(PyDict_Check(locals));
+#endif
 
     // test PyFrame_GetGlobals()
     PyObject *globals = PyFrame_GetGlobals(frame);