<commit_before>import pytest

@pytest.mark.xfail
def test_missing_file(audiomgr):
    sound = audiomgr.get_sound('/not/a/valid/file.ogg')
    assert sound is None<commit_msg>tests: Update audio test to recognize missing sounds as NullAudioSound<commit_after>import pytest

def test_missing_file(audiomgr):
    sound = audiomgr.get_sound('/not/a/valid/file.ogg')
    assert str(sound).startswith('NullAudioSound')
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{'dir': 'git-commits-cleaned', 'id': '7529240', 'n_tokens_mistral': 135, 'n_tokens_neox': 137, 'n_words': 27}