import pytest
from rag_store import search_knowledge
# Note: We are testing the import and basic function existence.
# Testing FAISS requires mocking or a real index.

def test_search_knowledge_empty():
    # If no index exists or empty query, what happens?
    # This assumes dependencies are installed.
    # We expect a list (maybe empty) or error if no index.
    try:
        results = search_knowledge("test query")
        assert isinstance(results, list)
    except Exception as e:
        # If index not found, that's also a valid "state" for a unit test to catch
        assert "index" in str(e).lower() or "not found" in str(e).lower()