H1K0
f6ce2a41d3
_encode_prefix now handles hold ('.') and no-chord ('NC') tokens
alongside chord symbols, and returns (ids, n_positions) so that
pos_in_bar is tracked correctly regardless of token type.
Fixes ChordParseError when dots were passed in --prefix.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
59 lines
2.0 KiB
Python
59 lines
2.0 KiB
Python
"""Tests for src/generate.py — prefix encoding and position tracking."""
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import pytest
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from src.generate import _encode_prefix, _HOLD, _NC, _ROOT_START, _BASS_START, _BASS_END
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from src.tokenizer import TOKEN_TO_ID
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def test_encode_prefix_chord_only():
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# "Cmaj7" in C major (shift=0) → ROOT_C QUAL_maj7 EXT_none BASS_root
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ids, n_pos = _encode_prefix(["Cmaj7"], shift=0)
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assert len(ids) == 4
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assert n_pos == 1
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assert ids[0] == TOKEN_TO_ID["ROOT_C"]
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assert ids[3] == TOKEN_TO_ID["BASS_root"]
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def test_encode_prefix_hold():
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ids, n_pos = _encode_prefix(["."], shift=0)
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assert ids == [_HOLD]
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assert n_pos == 1
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def test_encode_prefix_nc():
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ids, n_pos = _encode_prefix(["NC"], shift=0)
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assert ids == [_NC]
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assert n_pos == 1
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def test_encode_prefix_mixed():
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# "Abmaj7 . Fm7 . Db . Bbm ." — what the user tried and got a parse error on
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symbols = ["Abmaj7", ".", "Fm7", ".", "Db", ".", "Bbm", "."]
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# Ab major → shift to canonical C major = (0 - 8) % 12 = 4
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shift = (0 - 8) % 12
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ids, n_pos = _encode_prefix(symbols, shift=shift)
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assert n_pos == 8 # 8 bar positions
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# Dots become single HOLD tokens; chords become 4-token groups
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# Total tokens: 4 chords × 4 + 4 holds × 1 = 20
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assert len(ids) == 20
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# Every dot position must be a HOLD
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hold_positions = [1, 3, 5, 7] # indices in the symbol list
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# Reconstruct expected token positions: chord at 0→tokens 0-3, dot→token 4, etc.
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token_idx = 0
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for sym in symbols:
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if sym == ".":
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assert ids[token_idx] == _HOLD
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token_idx += 1
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else:
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assert _ROOT_START <= ids[token_idx] <= TOKEN_TO_ID["ROOT_B"]
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assert _BASS_START <= ids[token_idx + 3] <= _BASS_END
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token_idx += 4
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def test_encode_prefix_position_count_with_holds():
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# Mixed prefix: 2 chords and 2 holds = 4 positions
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ids, n_pos = _encode_prefix(["Am", ".", "G", "."], shift=0)
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assert n_pos == 4
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assert len(ids) == 2 * 4 + 2 * 1 # 10 tokens
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