"""Measured producer rate without camera hardware or wall-clock sleeps."""
import unittest
from unittest.mock import patch
from halloween.camera import CameraStream


class CameraRateTest(unittest.TestCase):
    def test_measured_rate_and_stale_frames(self):
        camera = CameraStream()
        with patch('halloween.camera.time.monotonic') as clock:
            clock.return_value = 10.
            self.assertEqual(camera.status()['fps'], 0)
            for i in range(60):
                clock.return_value = 10+i/15
                camera._publish(b'test')
            self.assertEqual(camera.status()['fps'], 15.)
            clock.return_value += 2
            self.assertEqual(camera.status()['fps'], 0)
        self.assertEqual(CameraStream(demo=True).status()['target_fps'], 5)