def test_camera_stream_copy_seconds():
camera = mock.Mock()
encoder = mock.Mock()
camera._encoders = {1: encoder}
stream = PiCameraCircularIO(camera, size=10)
for data, frame in generate_frames('hkffkff'):
encoder.frame = frame
stream.write(data)
output = io.BytesIO()
stream.copy_to(output, seconds=1)
assert output.getvalue() == b''
stream.copy_to(output, seconds=10)
assert output.getvalue() == b'hkkffkkff'
