"""Phase 10 invariant tests (RED).

Site 1 (L1594): _list_gemini_models_result helper must exist + return Result[list[str]].
"""
import sys
sys.path.insert(0, ".")

from src.result_types import Result, ErrorInfo


def test_phase10_site1_list_gemini_models_result_exists():
    import src.ai_client
    assert hasattr(src.ai_client, "_list_gemini_models_result"), \
        "_list_gemini_models_result helper missing from src.ai_client"


def test_phase10_site1_list_gemini_models_result_returns_result():
    """The helper must return a Result[list[str]]."""
    import src.ai_client
    fn = getattr(src.ai_client, "_list_gemini_models_result", None)
    assert fn is not None
    import inspect
    sig = inspect.signature(fn)
    # Should have a return annotation of Result
    assert "Result" in str(sig.return_annotation), \
        f"_list_gemini_models_result return annotation must be Result, got {sig.return_annotation}"


def test_phase10_site1_list_gemini_models_legacy_obliterated():
    """Legacy _list_gemini_models wrapper OBLITERATED (cruft-removal Phase 4)."""
    import src.ai_client
    assert not hasattr(src.ai_client, "_list_gemini_models"), (
        "_list_gemini_models legacy wrapper must be DELETED; "
        "callers must use _list_gemini_models_result(...).ok directly."
    )