import pytest
from unittest.mock import patch, MagicMock
import sys
import os
from typing import Any

# Ensure project root is in path for imports
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))

from gui_2 import App

def test_diagnostics_panel_initialization(app_instance: Any) -> None:
 assert "Diagnostics" in app_instance.show_windows
 assert "frame_time" in app_instance.perf_history
 assert len(app_instance.perf_history["frame_time"]) == 100

def test_diagnostics_history_updates(app_instance: Any) -> None:
 """
 Verifies that the internal performance history is updated correctly.
 This logic is inside the render loop in gui_2.py, but we can test
 the data structure and initialization.
 """
 assert "fps" in app_instance.perf_history
 assert len(app_instance.perf_history["fps"]) == 100