import pytest
from unittest.mock import MagicMock
import ai_client

def test_ai_client_event_emitter_exists():
    # This should fail initially because 'events' won't exist on ai_client
    assert hasattr(ai_client, 'events')
    assert ai_client.events is not None

def test_event_emission():
    # We'll expect these event names based on the spec
    mock_callback = MagicMock()
    ai_client.events.on("request_start", mock_callback)
    
    # Trigger something that should emit the event (once implemented)
    # For now, we just test the emitter itself if we were to call it manually
    ai_client.events.emit("request_start", payload={"model": "test"})
    
    mock_callback.assert_called_once_with(payload={"model": "test"})