import pytest
from registry import normalize_tool

def test_normalization_rejects_extra_fields():
    raw = {"name": "test", "description": "desc", "parameters": {"type": "object"}, "extra_field": "bad"}
    with pytest.raises(ValueError, match="unexpected fields"):
        normalize_tool(raw)

def test_normalization_rejects_empty_name():
    raw = {"name": "", "description": "desc", "parameters": {"type": "object"}}
    with pytest.raises(ValueError, match="non-empty string"):
        normalize_tool(raw)