import pytest
import numpy as np
import cv2
from app import YOLOv8Model
import pandas as pd

def test_model_initialization():
    try:
        model = YOLOv8Model()
        assert model is not None, "YOLOv8 model failed to initialize"
    except Exception as e:
        pytest.fail(f"YOLO model initialization failed: {e}")

def test_inference():
    frame = np.zeros((640, 640, 3), dtype=np.uint8)
    model = YOLOv8Model()
    result = model.predict(frame)
    assert isinstance(result, pd.DataFrame), "Expected results in DataFrame format"
    assert "name" in result.columns, "Violation class (name) missing in results"