"""Phase 10 invariant tests (RED) — sites 2+3: _delete_gemini_cache_result.

Sites 2 (L1680) and 3 (L1692): both are
    try: _gemini_client.caches.delete(name=_gemini_cache.name)
    except Exception as e: _append_comms("OUT", "request", {"message": f"[CACHE DELETE WARN] {e}"})

Migrate via single helper _delete_gemini_cache_result() -> Result[None].
"""
import sys
sys.path.insert(0, ".")


def test_phase10_site23_delete_gemini_cache_result_exists():
    import src.ai_client
    assert hasattr(src.ai_client, "_delete_gemini_cache_result"), \
        "_delete_gemini_cache_result helper missing"


def test_phase10_site23_delete_gemini_cache_result_returns_result():
    """The helper must return Result[None]."""
    import src.ai_client
    import inspect
    fn = src.ai_client._delete_gemini_cache_result
    sig = inspect.signature(fn)
    assert "Result" in str(sig.return_annotation), \
        f"_delete_gemini_cache_result return must be Result, got {sig.return_annotation}"