import unittest
import time
from performance_monitor import PerformanceMonitor

class TestPerformanceMonitor(unittest.TestCase):
    def setUp(self):
        self.monitor = PerformanceMonitor()

    def test_frame_time_collection(self):
        # Simulate frames for 1.1 seconds to trigger FPS calculation
        start = time.time()
        while time.time() - start < 1.1:
            self.monitor.start_frame()
            time.sleep(0.01)  # ~100 FPS
            self.monitor.end_frame()
        
        metrics = self.monitor.get_metrics()
        self.assertAlmostEqual(metrics['last_frame_time_ms'], 10, delta=10)
        self.assertGreater(metrics['fps'], 0)

    def test_cpu_usage_collection(self):
        metrics = self.monitor.get_metrics()
        self.assertIn('cpu_percent', metrics)
        self.assertIsInstance(metrics['cpu_percent'], float)

if __name__ == '__main__':
    unittest.main()