test_muse_rerere.py
python
| 1 | """Tests for Muse Rerere — reuse recorded resolutions. |
| 2 | |
| 3 | Verifies: |
| 4 | - record_conflict stores the conflict fingerprint hash correctly. |
| 5 | - record_resolution stores the postimage. |
| 6 | - apply_rerere returns the applied count and resolution on cache hit. |
| 7 | - apply_rerere returns (0, None) on cache miss. |
| 8 | - list_rerere returns all cached hashes. |
| 9 | - forget_rerere removes a single hash. |
| 10 | - clear_rerere empties the entire cache. |
| 11 | - Fingerprint is transposition-invariant (same shape at different pitches → same hash). |
| 12 | """ |
| 13 | from __future__ import annotations |
| 14 | |
| 15 | import json |
| 16 | from pathlib import Path |
| 17 | |
| 18 | import pytest |
| 19 | |
| 20 | from maestro.contracts.json_types import JSONObject |
| 21 | from maestro.services.muse_rerere import ( |
| 22 | ConflictDict, |
| 23 | apply_rerere, |
| 24 | clear_rerere, |
| 25 | forget_rerere, |
| 26 | list_rerere, |
| 27 | record_conflict, |
| 28 | record_resolution, |
| 29 | ) |
| 30 | |
| 31 | |
| 32 | # --------------------------------------------------------------------------- |
| 33 | # Fixtures |
| 34 | # --------------------------------------------------------------------------- |
| 35 | |
| 36 | |
| 37 | @pytest.fixture() |
| 38 | def repo_root(tmp_path: Path) -> Path: |
| 39 | """Return a temporary directory that looks like a Muse repo root.""" |
| 40 | muse_dir = tmp_path / ".muse" |
| 41 | muse_dir.mkdir() |
| 42 | return tmp_path |
| 43 | |
| 44 | |
| 45 | def _make_conflicts(region_id: str = "region-1", pitch: int = 60) -> list[ConflictDict]: |
| 46 | """Helper: build a minimal conflict list.""" |
| 47 | return [ |
| 48 | ConflictDict( |
| 49 | region_id=region_id, |
| 50 | type="note", |
| 51 | description=f"Both sides modified note at pitch={pitch} beat=1.0", |
| 52 | ) |
| 53 | ] |
| 54 | |
| 55 | |
| 56 | # --------------------------------------------------------------------------- |
| 57 | # record_conflict |
| 58 | # --------------------------------------------------------------------------- |
| 59 | |
| 60 | |
| 61 | def test_record_conflict_stores_hash_correctly(repo_root: Path) -> None: |
| 62 | """record_conflict returns a consistent hex SHA-256 hash.""" |
| 63 | conflicts = _make_conflicts() |
| 64 | h = record_conflict(repo_root, conflicts) |
| 65 | |
| 66 | assert isinstance(h, str) |
| 67 | assert len(h) == 64 # SHA-256 hex digest |
| 68 | assert (repo_root / ".muse" / "rr-cache" / h / "conflict").exists() |
| 69 | |
| 70 | |
| 71 | def test_record_conflict_is_idempotent(repo_root: Path) -> None: |
| 72 | """Calling record_conflict twice with the same conflicts yields the same hash.""" |
| 73 | conflicts = _make_conflicts() |
| 74 | h1 = record_conflict(repo_root, conflicts) |
| 75 | h2 = record_conflict(repo_root, conflicts) |
| 76 | assert h1 == h2 |
| 77 | |
| 78 | |
| 79 | def test_record_conflict_transposition_invariant(repo_root: Path) -> None: |
| 80 | """Conflicts at pitch=60 and pitch=72 (same interval pattern) → same hash.""" |
| 81 | c_at_c4 = _make_conflicts(pitch=60) |
| 82 | c_at_c5 = _make_conflicts(pitch=72) |
| 83 | h1 = record_conflict(repo_root, c_at_c4) |
| 84 | h2 = record_conflict(repo_root, c_at_c5) |
| 85 | # Both have a single conflict with relative pitch offset 0 → same fingerprint. |
| 86 | assert h1 == h2 |
| 87 | |
| 88 | |
| 89 | def test_record_conflict_different_structure_gives_different_hash(repo_root: Path) -> None: |
| 90 | """Structurally different conflict sets produce different hashes.""" |
| 91 | c1 = _make_conflicts(region_id="region-1") |
| 92 | c2 = _make_conflicts(region_id="region-2") |
| 93 | h1 = record_conflict(repo_root, c1) |
| 94 | h2 = record_conflict(repo_root, c2) |
| 95 | assert h1 != h2 |
| 96 | |
| 97 | |
| 98 | # --------------------------------------------------------------------------- |
| 99 | # record_resolution |
| 100 | # --------------------------------------------------------------------------- |
| 101 | |
| 102 | |
| 103 | def test_record_resolution_stores_postimage(repo_root: Path) -> None: |
| 104 | """record_resolution writes the postimage file for an existing conflict hash.""" |
| 105 | conflicts = _make_conflicts() |
| 106 | h = record_conflict(repo_root, conflicts) |
| 107 | resolution: JSONObject = {"strategy": "ours", "region_id": "region-1"} |
| 108 | |
| 109 | record_resolution(repo_root, h, resolution) |
| 110 | |
| 111 | postimage = repo_root / ".muse" / "rr-cache" / h / "postimage" |
| 112 | assert postimage.exists() |
| 113 | stored = json.loads(postimage.read_text()) |
| 114 | assert stored == resolution |
| 115 | |
| 116 | |
| 117 | def test_record_resolution_raises_for_unknown_hash(repo_root: Path) -> None: |
| 118 | """record_resolution raises FileNotFoundError for an unrecognised hash.""" |
| 119 | with pytest.raises(FileNotFoundError, match="not found in rr-cache"): |
| 120 | record_resolution(repo_root, "a" * 64, {"foo": "bar"}) |
| 121 | |
| 122 | |
| 123 | # --------------------------------------------------------------------------- |
| 124 | # apply_rerere |
| 125 | # --------------------------------------------------------------------------- |
| 126 | |
| 127 | |
| 128 | def test_apply_rerere_returns_applied_count_on_cache_hit(repo_root: Path) -> None: |
| 129 | """apply_rerere returns (len(conflicts), resolution) when a postimage exists.""" |
| 130 | conflicts = _make_conflicts() |
| 131 | h = record_conflict(repo_root, conflicts) |
| 132 | resolution: JSONObject = {"strategy": "ours"} |
| 133 | record_resolution(repo_root, h, resolution) |
| 134 | |
| 135 | applied, returned_resolution = apply_rerere(repo_root, conflicts) |
| 136 | |
| 137 | assert applied == len(conflicts) |
| 138 | assert returned_resolution == resolution |
| 139 | |
| 140 | |
| 141 | def test_apply_rerere_returns_zero_on_cache_miss(repo_root: Path) -> None: |
| 142 | """apply_rerere returns (0, None) when no postimage is cached.""" |
| 143 | conflicts = _make_conflicts() |
| 144 | # Record conflict but NOT the resolution → no postimage. |
| 145 | record_conflict(repo_root, conflicts) |
| 146 | |
| 147 | applied, resolution = apply_rerere(repo_root, conflicts) |
| 148 | |
| 149 | assert applied == 0 |
| 150 | assert resolution is None |
| 151 | |
| 152 | |
| 153 | def test_apply_rerere_returns_zero_for_unknown_conflicts(repo_root: Path) -> None: |
| 154 | """apply_rerere returns (0, None) for conflicts with no rr-cache entry at all.""" |
| 155 | conflicts = _make_conflicts(region_id="never-seen-region") |
| 156 | applied, resolution = apply_rerere(repo_root, conflicts) |
| 157 | assert applied == 0 |
| 158 | assert resolution is None |
| 159 | |
| 160 | |
| 161 | def test_apply_rerere_empty_conflicts_returns_zero(repo_root: Path) -> None: |
| 162 | """apply_rerere short-circuits and returns (0, None) when conflict list is empty.""" |
| 163 | applied, resolution = apply_rerere(repo_root, []) |
| 164 | assert applied == 0 |
| 165 | assert resolution is None |
| 166 | |
| 167 | |
| 168 | # --------------------------------------------------------------------------- |
| 169 | # list_rerere |
| 170 | # --------------------------------------------------------------------------- |
| 171 | |
| 172 | |
| 173 | def test_list_rerere_returns_all_cached_hashes(repo_root: Path) -> None: |
| 174 | """list_rerere returns a sorted list of all conflict hashes in the cache.""" |
| 175 | h1 = record_conflict(repo_root, _make_conflicts(region_id="r1")) |
| 176 | h2 = record_conflict(repo_root, _make_conflicts(region_id="r2")) |
| 177 | |
| 178 | hashes = list_rerere(repo_root) |
| 179 | |
| 180 | assert sorted([h1, h2]) == hashes |
| 181 | |
| 182 | |
| 183 | def test_list_rerere_empty_cache(repo_root: Path) -> None: |
| 184 | """list_rerere returns an empty list when the cache is empty.""" |
| 185 | assert list_rerere(repo_root) == [] |
| 186 | |
| 187 | |
| 188 | # --------------------------------------------------------------------------- |
| 189 | # forget_rerere |
| 190 | # --------------------------------------------------------------------------- |
| 191 | |
| 192 | |
| 193 | def test_forget_rerere_removes_one_hash(repo_root: Path) -> None: |
| 194 | """forget_rerere removes exactly the specified entry.""" |
| 195 | h1 = record_conflict(repo_root, _make_conflicts(region_id="r1")) |
| 196 | h2 = record_conflict(repo_root, _make_conflicts(region_id="r2")) |
| 197 | |
| 198 | removed = forget_rerere(repo_root, h1) |
| 199 | |
| 200 | assert removed is True |
| 201 | hashes = list_rerere(repo_root) |
| 202 | assert h1 not in hashes |
| 203 | assert h2 in hashes |
| 204 | |
| 205 | |
| 206 | def test_forget_rerere_returns_false_for_unknown_hash(repo_root: Path) -> None: |
| 207 | """forget_rerere returns False (not an error) for an unknown hash.""" |
| 208 | assert forget_rerere(repo_root, "b" * 64) is False |
| 209 | |
| 210 | |
| 211 | # --------------------------------------------------------------------------- |
| 212 | # clear_rerere |
| 213 | # --------------------------------------------------------------------------- |
| 214 | |
| 215 | |
| 216 | def test_clear_rerere_empties_cache(repo_root: Path) -> None: |
| 217 | """clear_rerere removes all entries from the rr-cache.""" |
| 218 | record_conflict(repo_root, _make_conflicts(region_id="r1")) |
| 219 | record_conflict(repo_root, _make_conflicts(region_id="r2")) |
| 220 | record_conflict(repo_root, _make_conflicts(region_id="r3")) |
| 221 | |
| 222 | removed = clear_rerere(repo_root) |
| 223 | |
| 224 | assert removed == 3 |
| 225 | assert list_rerere(repo_root) == [] |
| 226 | |
| 227 | |
| 228 | def test_clear_rerere_empty_cache_returns_zero(repo_root: Path) -> None: |
| 229 | """clear_rerere on an already empty cache returns 0.""" |
| 230 | assert clear_rerere(repo_root) == 0 |