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feedBack/tests/test_sloppak_drum_parts.py
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Python

"""Loader coverage for MULTIPLE drum parts (feedpak 1.17.0 "drums as
arrangements").
A drum part rides the manifest as a `type: drums` arrangement entry carrying
a per-arrangement `drum_tab` file pointer and NO note `file`. The loader:
- NEVER turns a pointer entry into a fretted Arrangement — that skip is
the grading invariant (an empty drum chart must not reach the fretted
pipeline, where note detection would grade it as garbage);
- resolves the parts into `LoadedSloppak.drum_parts`, primary FIRST: the
entry aliasing the song-level `drum_tab:` file contributes its id/name
but is never loaded twice (its payload IS `loaded.drum_tab`);
- loads each extra part's file with the same permissive posture as the
song-level tab (a bad part disables that part only, never the load);
- copes with a pointer-only pack (no song-level key): the first part
becomes the primary so every legacy consumer keeps working.
"""
from __future__ import annotations
import json
from pathlib import Path
import yaml
import sloppak as sloppak_mod
def _tab(name: str, hits: list[dict] | None = None) -> dict:
return {
"version": 1,
"name": name,
"kit": [{"id": "kick", "name": "Kick"}],
"hits": hits if hits is not None else [{"t": 1.0, "p": "kick", "v": 100}],
}
def _write_pak(root: Path, manifest_extras: dict, files: dict[str, dict | str]) -> Path:
"""A minimal directory-form sloppak with one Lead arrangement plus the
given extra files ({relpath: json-dict-or-raw-text})."""
pak = root / f"{root.name}.sloppak"
pak.mkdir()
arr_dir = pak / "arrangements"
arr_dir.mkdir()
arr = {
"name": "Lead", "tuning": [0, 0, 0, 0, 0, 0], "capo": 0,
"notes": [], "chords": [], "anchors": [], "handshapes": [],
"templates": [], "beats": [], "sections": [],
}
(arr_dir / "lead.json").write_text(json.dumps(arr))
manifest = {
"title": "Test", "artist": "Tester", "album": "", "year": 2026,
"duration": 10.0,
"arrangements": [
{"id": "lead", "name": "Lead", "file": "arrangements/lead.json"},
],
"stems": [{"id": "full", "file": "stems/full.ogg", "default": True}],
}
manifest.update(manifest_extras)
(pak / "manifest.yaml").write_text(yaml.safe_dump(manifest, sort_keys=False))
for rel, payload in files.items():
text = payload if isinstance(payload, str) else json.dumps(payload)
(pak / rel).write_text(text)
return pak
def _load(pak_path: Path, tmp_path: Path):
dlc_root = pak_path.parent
cache = tmp_path / "cache"
cache.mkdir()
return sloppak_mod.load_song(pak_path.name, dlc_root, cache)
def _two_part_manifest() -> dict:
"""The exact shape the editor writes: primary alias entry + one extra."""
return {
"drum_tab": "drum_tab.json",
"arrangements": [
{"id": "lead", "name": "Lead", "file": "arrangements/lead.json"},
{"id": "drums", "name": "Drums", "type": "drums",
"drum_tab": "drum_tab.json"},
{"id": "drums-2", "name": "Drums (Live)", "type": "drums",
"drum_tab": "drum_tab_drums-2.json"},
],
}
# ── The grading invariant ────────────────────────────────────────────────────
def test_pointer_entries_never_become_fretted_arrangements(tmp_path: Path):
pak = _write_pak(tmp_path, _two_part_manifest(), {
"drum_tab.json": _tab("Drums"),
"drum_tab_drums-2.json": _tab("Drums (Live)"),
})
loaded = _load(pak, tmp_path)
# Only the Lead chart is an Arrangement — neither drum part enters the
# fretted pipeline (song.arrangements is what note detection grades).
assert [a.name for a in loaded.song.arrangements] == ["Lead"]
# And the ids list stays parallel to song.arrangements (skipped entries
# contribute nothing) — a misalignment here would remap every chart edit.
assert loaded.arrangement_ids == ["lead"]
# ── Parts resolution ─────────────────────────────────────────────────────────
def test_two_parts_resolve_primary_first_with_alias_identity(tmp_path: Path):
pak = _write_pak(tmp_path, _two_part_manifest(), {
"drum_tab.json": _tab("Drums"),
"drum_tab_drums-2.json": _tab("Drums (Live)", [{"t": 2.0, "p": "kick", "v": 90}]),
})
loaded = _load(pak, tmp_path)
assert loaded.drum_parts is not None
assert [(p["id"], p["name"]) for p in loaded.drum_parts] == [
("drums", "Drums"), ("drums-2", "Drums (Live)"),
]
# The primary's payload IS the song-level tab — same object, loaded once.
assert loaded.drum_parts[0]["drum_tab"] is loaded.drum_tab
assert loaded.drum_parts[1]["drum_tab"]["hits"][0]["t"] == 2.0
def test_primary_pointer_equivalent_path_is_not_duplicated(tmp_path: Path):
manifest = {
"drum_tab": "drum_tab.json",
"arrangements": [
{"id": "lead", "name": "Lead", "file": "arrangements/lead.json"},
{"id": "kit", "name": "Live Kit", "type": "drums",
"drum_tab": "./drum_tab.json"},
],
}
pak = _write_pak(tmp_path, manifest, {"drum_tab.json": _tab("Drums")})
loaded = _load(pak, tmp_path)
assert loaded.drum_parts is not None
assert [(p["id"], p["name"]) for p in loaded.drum_parts] == [
("kit", "Live Kit"),
]
assert loaded.drum_parts[0]["drum_tab"] is loaded.drum_tab
def test_legacy_single_drum_pack_gets_a_one_part_list(tmp_path: Path):
pak = _write_pak(tmp_path, {"drum_tab": "drum_tab.json"}, {
"drum_tab.json": _tab("Drums"),
})
loaded = _load(pak, tmp_path)
assert loaded.drum_parts is not None and len(loaded.drum_parts) == 1
assert loaded.drum_parts[0]["id"] == "drums"
assert loaded.drum_parts[0]["drum_tab"] is loaded.drum_tab
def test_no_drums_means_no_parts(tmp_path: Path):
pak = _write_pak(tmp_path, {}, {})
loaded = _load(pak, tmp_path)
assert loaded.drum_parts is None
assert loaded.drum_tab is None
def test_pointer_only_pack_promotes_the_first_part_to_primary(tmp_path: Path):
# A writer that omitted the song-level alias: readers must cope (the
# spec keeps the alias, but a reader never crashes on its absence).
pak = _write_pak(tmp_path, {
"arrangements": [
{"id": "lead", "name": "Lead", "file": "arrangements/lead.json"},
{"id": "kit", "name": "Kit", "type": "drums",
"drum_tab": "drum_tab_kit.json"},
],
}, {"drum_tab_kit.json": _tab("Kit")})
loaded = _load(pak, tmp_path)
assert loaded.drum_parts is not None and len(loaded.drum_parts) == 1
# The part's tab becomes THE drum tab, so has_drum_tab / the default
# stream / the drum-only placeholder all keep working.
assert loaded.drum_tab is loaded.drum_parts[0]["drum_tab"]
assert loaded.drum_parts[0]["id"] == "kit"
# ── Permissive per-part failure ──────────────────────────────────────────────
def test_a_bad_extra_part_disables_that_part_only(tmp_path: Path):
manifest = _two_part_manifest()
manifest["arrangements"].append(
{"id": "drums-3", "name": "Broken", "type": "drums",
"drum_tab": "drum_tab_broken.json"})
pak = _write_pak(tmp_path, manifest, {
"drum_tab.json": _tab("Drums"),
"drum_tab_drums-2.json": _tab("Drums (Live)"),
"drum_tab_broken.json": "not json {{{",
})
loaded = _load(pak, tmp_path)
assert [p["id"] for p in loaded.drum_parts] == ["drums", "drums-2"]
def test_a_traversal_part_path_is_skipped(tmp_path: Path):
manifest = _two_part_manifest()
manifest["arrangements"][2]["drum_tab"] = "../outside.json"
(tmp_path / "outside.json").write_text(json.dumps(_tab("Evil")))
pak = _write_pak(tmp_path, manifest, {"drum_tab.json": _tab("Drums")})
loaded = _load(pak, tmp_path)
assert [p["id"] for p in loaded.drum_parts] == ["drums"]
def test_duplicate_pointer_rels_load_once(tmp_path: Path):
manifest = _two_part_manifest()
manifest["arrangements"].append(
{"id": "drums-dup", "name": "Dup", "type": "drums",
"drum_tab": "drum_tab_drums-2.json"})
pak = _write_pak(tmp_path, manifest, {
"drum_tab.json": _tab("Drums"),
"drum_tab_drums-2.json": _tab("Drums (Live)"),
})
loaded = _load(pak, tmp_path)
assert [p["id"] for p in loaded.drum_parts] == ["drums", "drums-2"]
def test_duplicate_part_ids_are_made_unique(tmp_path: Path):
manifest = _two_part_manifest()
manifest["arrangements"][2]["id"] = "drums"
manifest["arrangements"].append(
{"id": "drums-2", "name": "Aux", "type": "drums",
"drum_tab": "drum_tab_aux.json"})
pak = _write_pak(tmp_path, manifest, {
"drum_tab.json": _tab("Drums"),
"drum_tab_drums-2.json": _tab("Drums (Live)"),
"drum_tab_aux.json": _tab("Aux"),
})
loaded = _load(pak, tmp_path)
assert [p["id"] for p in loaded.drum_parts] == ["drums", "drums-2", "drums-3"]
def test_drum_pointer_with_wrong_type_logs_warning(tmp_path: Path, caplog):
pak = _write_pak(tmp_path, {
"arrangements": [
{"id": "lead", "name": "Lead", "file": "arrangements/lead.json"},
{"id": "typo", "type": "druns", "drum_tab": "drum_tab_typo.json"},
],
}, {"drum_tab_typo.json": _tab("Typo")})
loaded = _load(pak, tmp_path)
assert loaded.drum_parts is None
assert "has drum_tab" in caplog.text and "type='druns'" in caplog.text
# ── Drum-only pack with parts ────────────────────────────────────────────────
def test_drum_only_pack_with_pointer_entries_still_synthesizes_placeholder(tmp_path: Path):
# No pitched arrangements at all, drums via pointer entries only: the
# placeholder "Drums" arrangement must still appear so the highway WS
# proceeds and the tab reaches the drum highway.
pak = _write_pak(tmp_path, {
"arrangements": [
{"id": "kit", "name": "Kit", "type": "drums",
"drum_tab": "drum_tab_kit.json"},
],
}, {"drum_tab_kit.json": _tab("Kit", [{"t": 5.0, "p": "kick", "v": 100}])})
# Remove the Lead arrangement _write_pak added to the manifest.
manifest_path = pak / "manifest.yaml"
manifest = yaml.safe_load(manifest_path.read_text())
manifest["arrangements"] = [e for e in manifest["arrangements"] if e.get("id") != "lead"]
manifest.pop("duration", None)
manifest_path.write_text(yaml.safe_dump(manifest, sort_keys=False))
loaded = _load(pak, tmp_path)
assert [a.name for a in loaded.song.arrangements] == ["Drums"]
assert loaded.drum_parts is not None and loaded.drum_parts[0]["id"] == "kit"
# Song length derived from the last hit (the drum-only path's rule).
assert loaded.song.song_length > 5.0