"""CPU-only YuE2 worker regression tests; never import torch or run inference."""
import importlib.util
from pathlib import Path
import unittest

spec = importlib.util.spec_from_file_location('yue2_worker', Path(__file__).parents[1] / 'scripts/yue2-worker.py')
worker = importlib.util.module_from_spec(spec)
spec.loader.exec_module(worker)


class WorkerTests(unittest.TestCase):
    def test_lyrics_preserve_words_and_normalize_ui_headings(self):
        self.assertEqual(worker.normalize_lyrics('[Pre-Chorus]\nEvery word stays\n[Outro]\n'), '[prechorus]\nEvery word stays\n\n')
        self.assertEqual(worker.normalize_lyrics('[Verse 1]\nHello'), '[verse1]\nHello\n\n')
        for lyrics in ['', 'No heading', '[Verse]\nA\n[Chorus]\nB']:
            with self.assertRaises(ValueError):
                worker.normalize_lyrics(lyrics)


if __name__ == '__main__':
    unittest.main()