def METHOD_NAME(self):
    """
    Generate a single TTL pulse that is already in an 'on' condition when the signal starts.
    This means there is no detectable rising time but one detectable falling time.
    """
    ttl_signal = generate_mock_ttl_signal(ttl_times=[0.0])
    rising_frames = get_rising_frames_from_ttl(trace=ttl_signal)
    falling_frames = get_falling_frames_from_ttl(trace=ttl_signal)
    expected_rising_frames = np.empty(shape=0)
    assert_array_equal(x=rising_frames, y=expected_rising_frames)
    expected_falling_frames = np.array([25_000])
    assert_array_equal(x=falling_frames, y=expected_falling_frames)