Make `test_c_subclass_of_heap_ctype_with_tpdealloc_decrefs_once` and `test_c_subclass_of_heap_ctype_with_del_modifying_dunder_class_only_decrefs_once` behavioral tests

Feature or enhancement

Proposal:

The test_c_subclass_of_heap_ctype_with_tpdealloc_decrefs_once and test_c_subclass_of_heap_ctype_with_del_modifying_dunder_class_only_decrefs_once tests were added to verify that we don't decref a type object too many times when destroying an instance of the type in certain scenarios. The tests currently verify this by checking reference counts. This is sensitive to implementation details and likely to break in the future. To make this more robust, we'd like to refactor the tests and supporting C code to verify that we don't crash (a symptom of decrefing too many times).

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

搜索 test_c_subclass_of_heap_ctype_with_tpdealloc_decrefs_once 和 test_c_subclass_of_heap_ctype_with_del_modifying_dunder_class_only_decrefs_once，然后检查这些测试所使用的辅助 C 代码。重构测试和 C 支持代码，使其验证这些场景不会崩溃，而不是检查引用计数；运行受影响的测试以确认此行为。