def test_align_assigns_speaker_by_overlap():
    from alignment import align_segments
    whisper = [
        {"start": 0.0, "end": 2.0, "text": "Hallo"},
        {"start": 2.1, "end": 4.0, "text": "Wie geht es"},
    ]
    speakers = [
        (0.0, 2.5, "SPEAKER_00"),
        (2.5, 5.0, "SPEAKER_01"),
    ]
    result = align_segments(whisper, speakers)
    assert result[0] == ("SPEAKER_00", "Hallo")
    assert result[1] == ("SPEAKER_01", "Wie geht es")


def test_align_merges_consecutive_same_speaker():
    from alignment import align_segments
    whisper = [
        {"start": 0.0, "end": 1.0, "text": "Hallo"},
        {"start": 1.1, "end": 2.0, "text": "Welt"},
    ]
    speakers = [(0.0, 3.0, "SPEAKER_00")]
    result = align_segments(whisper, speakers)
    assert len(result) == 1
    assert result[0] == ("SPEAKER_00", "Hallo Welt")


def test_align_fallback_when_no_speaker_overlap():
    from alignment import align_segments
    whisper = [{"start": 0.0, "end": 1.0, "text": "Hallo"}]
    speakers = []
    result = align_segments(whisper, speakers)
    assert result[0][0] == "SPEAKER_00"