from rally_follow import video_cmd


def test_video_cmd_without_preview_has_no_kmssink():
    cmd = video_cmd("/dev/rally", 1920, 1080, 30, 8, preview=None)
    s = " ".join(cmd)
    assert "kmssink" not in s
    assert "tee" not in cmd
    assert "fdsink" in cmd
    assert "fd=8" in cmd
    assert "device=/dev/rally" in s