Pre-change TDD tests for the std::list -> std::vector container swap:
- tests/unit/entity_collection_mutation_test.py pins observable behavior:
positive/negative indexing, out-of-range IndexError, slicing (returns a
fresh list; slice wrappers are not cache-identity), in-order iteration,
RuntimeError on size change during iteration, and grid.step() immunity to
mid-step entity self-removal.
- tests/regression/issue_329_entity_index_perf_test.py guards against a
regression to O(n) indexed access / O(n^2) full-scan.
Both pass against the pre-swap std::list implementation, locking in the
public contract before the internal container change.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
