test_divergence.py
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| 1 | """Section 26 — Divergence Engine: 7-layer test suite. |
| 2 | |
| 3 | Covers musehub/services/musehub_divergence.py and the |
| 4 | GET /api/repos/{repo_id}/divergence endpoint. |
| 5 | |
| 6 | Layer map |
| 7 | --------- |
| 8 | 1. Unit — classify_message, score_to_level, compute_hub_dimension_divergence, |
| 9 | find_common_ancestor, get_commits_since, extract_affected_sections, |
| 10 | _delta_label, build_zero_diff_response, constants |
| 11 | 2. Integration — get_branch_commits, compute_hub_divergence (full pipeline) |
| 12 | 3. E2E — HTTP GET /api/repos/{repo_id}/divergence |
| 13 | 4. Stress — large histories, many-dimension calls, concurrent computes |
| 14 | 5. Data Integrity — score bounds, ordering, common ancestor correctness |
| 15 | 6. Security — auth / visibility, invalid branch names safe |
| 16 | 7. Performance — timing budgets |
| 17 | """ |
| 18 | from __future__ import annotations |
| 19 | |
| 20 | import asyncio |
| 21 | import secrets |
| 22 | import time |
| 23 | from datetime import datetime, timezone, timedelta |
| 24 | |
| 25 | import pytest |
| 26 | from httpx import AsyncClient |
| 27 | from sqlalchemy.ext.asyncio import AsyncSession |
| 28 | from unittest.mock import MagicMock |
| 29 | |
| 30 | from musehub.core.genesis import compute_identity_id, compute_repo_id |
| 31 | from musehub.db.musehub_repo_models import MusehubCommit, MusehubCommitRef, MusehubRepo |
| 32 | from musehub.types.json_types import StrDict |
| 33 | from musehub.services.musehub_divergence import ( |
| 34 | ALL_DIMENSIONS, |
| 35 | _DIMENSION_PATTERNS, |
| 36 | _SECTION_RE, |
| 37 | MuseHubDivergenceLevel, |
| 38 | MuseHubDivergenceResult, |
| 39 | MuseHubDimensionDivergence, |
| 40 | _delta_label, |
| 41 | build_proposal_diff_response, |
| 42 | build_zero_diff_response, |
| 43 | classify_message, |
| 44 | compute_hub_dimension_divergence, |
| 45 | compute_hub_divergence, |
| 46 | extract_affected_sections, |
| 47 | find_common_ancestor, |
| 48 | get_branch_commits, |
| 49 | get_commits_since, |
| 50 | score_to_level, |
| 51 | ) |
| 52 | |
| 53 | |
| 54 | # --------------------------------------------------------------------------- |
| 55 | # DB helpers |
| 56 | # --------------------------------------------------------------------------- |
| 57 | |
| 58 | |
| 59 | def _uid() -> str: |
| 60 | return secrets.token_hex(16) |
| 61 | |
| 62 | |
| 63 | def _cid() -> str: |
| 64 | return secrets.token_hex(16) |
| 65 | |
| 66 | |
| 67 | _TEST_OWNER_ID = compute_identity_id(b"test-divergence-owner") |
| 68 | |
| 69 | |
| 70 | async def _db_repo(session: AsyncSession, *, visibility: str = "private") -> str: |
| 71 | from datetime import datetime, timezone |
| 72 | slug = f"repo-{secrets.token_hex(4)}" |
| 73 | created_at = datetime.now(timezone.utc) |
| 74 | repo_id = compute_repo_id(_TEST_OWNER_ID, slug, "code", created_at.isoformat()) |
| 75 | repo = MusehubRepo( |
| 76 | repo_id=repo_id, |
| 77 | name=slug, |
| 78 | slug=slug, |
| 79 | owner="testuser", |
| 80 | owner_user_id=_TEST_OWNER_ID, |
| 81 | visibility=visibility, |
| 82 | created_at=created_at, |
| 83 | updated_at=created_at, |
| 84 | ) |
| 85 | session.add(repo) |
| 86 | await session.flush() |
| 87 | return repo.repo_id |
| 88 | |
| 89 | |
| 90 | async def _db_commit( |
| 91 | session: AsyncSession, |
| 92 | repo_id: str, |
| 93 | *, |
| 94 | branch: str = "main", |
| 95 | message: str = "add groove", |
| 96 | parent_ids: list[str] | None = None, |
| 97 | ts: datetime | None = None, |
| 98 | ) -> MusehubCommit: |
| 99 | c = MusehubCommit( |
| 100 | commit_id=_cid(), |
| 101 | branch=branch, |
| 102 | parent_ids=parent_ids or [], |
| 103 | message=message, |
| 104 | author="agent", |
| 105 | timestamp=ts or datetime.now(timezone.utc), |
| 106 | ) |
| 107 | session.add(c) |
| 108 | session.add(MusehubCommitRef(repo_id=repo_id, commit_id=c.commit_id)) |
| 109 | await session.flush() |
| 110 | return c |
| 111 | |
| 112 | |
| 113 | async def _api_repo( |
| 114 | client: AsyncClient, |
| 115 | auth_headers: StrDict, |
| 116 | *, |
| 117 | visibility: str = "private", |
| 118 | ) -> str: |
| 119 | r = await client.post( |
| 120 | "/api/repos", |
| 121 | json={ |
| 122 | "name": f"div-{_uid()[:8]}", |
| 123 | "owner": "testuser", |
| 124 | "visibility": visibility, |
| 125 | }, |
| 126 | headers=auth_headers, |
| 127 | ) |
| 128 | assert r.status_code == 201, r.text |
| 129 | return r.json()["repoId"] |
| 130 | |
| 131 | |
| 132 | # =========================================================================== |
| 133 | # Layer 1 — Unit |
| 134 | # =========================================================================== |
| 135 | |
| 136 | |
| 137 | class TestUnitConstants: |
| 138 | def test_all_dimensions_five(self) -> None: |
| 139 | assert len(ALL_DIMENSIONS) == 5 |
| 140 | |
| 141 | def test_all_dimensions_names(self) -> None: |
| 142 | assert set(ALL_DIMENSIONS) == {"melodic", "harmonic", "rhythmic", "structural", "dynamic"} |
| 143 | |
| 144 | def test_dimension_patterns_covers_all(self) -> None: |
| 145 | for dim in ALL_DIMENSIONS: |
| 146 | assert dim in _DIMENSION_PATTERNS |
| 147 | |
| 148 | def test_section_re_compiles(self) -> None: |
| 149 | assert _SECTION_RE.pattern is not None |
| 150 | |
| 151 | |
| 152 | class TestUnitClassifyMessage: |
| 153 | def test_melodic_keywords(self) -> None: |
| 154 | assert "melodic" in classify_message("add melody line") |
| 155 | assert "melodic" in classify_message("record lead solo") |
| 156 | assert "melodic" in classify_message("fix pitch drift") |
| 157 | |
| 158 | def test_harmonic_keywords(self) -> None: |
| 159 | assert "harmonic" in classify_message("add chord progression") |
| 160 | assert "harmonic" in classify_message("change key to Dm") |
| 161 | |
| 162 | def test_rhythmic_keywords(self) -> None: |
| 163 | assert "rhythmic" in classify_message("adjust tempo to 120 bpm") |
| 164 | assert "rhythmic" in classify_message("tighten drum groove") |
| 165 | |
| 166 | def test_structural_keywords(self) -> None: |
| 167 | assert "structural" in classify_message("rewrite bridge section") |
| 168 | assert "structural" in classify_message("add chorus after verse") |
| 169 | |
| 170 | def test_dynamic_keywords(self) -> None: |
| 171 | assert "dynamic" in classify_message("apply reverb to guitar") |
| 172 | assert "dynamic" in classify_message("master mix levels") |
| 173 | |
| 174 | def test_multi_dimension_message(self) -> None: |
| 175 | dims = classify_message("add jazzy chord melody with reverb") |
| 176 | assert "melodic" in dims |
| 177 | assert "harmonic" in dims |
| 178 | assert "dynamic" in dims |
| 179 | |
| 180 | def test_unclassified_returns_empty(self) -> None: |
| 181 | assert classify_message("update README") == set() |
| 182 | assert classify_message("fix typo in config") == set() |
| 183 | |
| 184 | def test_case_insensitive(self) -> None: |
| 185 | assert "melodic" in classify_message("Add MELODY line") |
| 186 | assert "rhythmic" in classify_message("DRUM pattern fix") |
| 187 | |
| 188 | def test_empty_message(self) -> None: |
| 189 | assert classify_message("") == set() |
| 190 | |
| 191 | |
| 192 | class TestUnitScoreToLevel: |
| 193 | def test_zero_is_none(self) -> None: |
| 194 | assert score_to_level(0.0) == MuseHubDivergenceLevel.NONE |
| 195 | |
| 196 | def test_boundary_0_15_is_low(self) -> None: |
| 197 | assert score_to_level(0.15) == MuseHubDivergenceLevel.LOW |
| 198 | |
| 199 | def test_mid_range_low(self) -> None: |
| 200 | assert score_to_level(0.25) == MuseHubDivergenceLevel.LOW |
| 201 | |
| 202 | def test_boundary_0_40_is_med(self) -> None: |
| 203 | assert score_to_level(0.40) == MuseHubDivergenceLevel.MED |
| 204 | |
| 205 | def test_mid_range_med(self) -> None: |
| 206 | assert score_to_level(0.55) == MuseHubDivergenceLevel.MED |
| 207 | |
| 208 | def test_boundary_0_70_is_high(self) -> None: |
| 209 | assert score_to_level(0.70) == MuseHubDivergenceLevel.HIGH |
| 210 | |
| 211 | def test_one_is_high(self) -> None: |
| 212 | assert score_to_level(1.0) == MuseHubDivergenceLevel.HIGH |
| 213 | |
| 214 | def test_just_below_0_15_is_none(self) -> None: |
| 215 | assert score_to_level(0.14) == MuseHubDivergenceLevel.NONE |
| 216 | |
| 217 | |
| 218 | class TestUnitComputeHubDimensionDivergence: |
| 219 | def _make_commit(self, cid: str) -> MusehubCommit: |
| 220 | c = MusehubCommit.__new__(MusehubCommit) |
| 221 | object.__setattr__(c, "commit_id", cid) |
| 222 | return c |
| 223 | |
| 224 | def test_identical_sets_score_zero(self) -> None: |
| 225 | a_ids = {"c1", "c2"} |
| 226 | b_ids = {"c1", "c2"} |
| 227 | a_msgs = {"c1": "add chord", "c2": "fix chord progression"} |
| 228 | b_msgs = {"c1": "add chord", "c2": "fix chord progression"} |
| 229 | result = compute_hub_dimension_divergence("harmonic", a_ids, b_ids, a_msgs, b_msgs) |
| 230 | assert result.score == 0.0 |
| 231 | assert result.level == MuseHubDivergenceLevel.NONE |
| 232 | |
| 233 | def test_disjoint_sets_score_one(self) -> None: |
| 234 | a_ids = {"c1"} |
| 235 | b_ids = {"c2"} |
| 236 | a_msgs = {"c1": "add chord"} |
| 237 | b_msgs = {"c2": "fix harmony"} |
| 238 | result = compute_hub_dimension_divergence("harmonic", a_ids, b_ids, a_msgs, b_msgs) |
| 239 | assert result.score == 1.0 |
| 240 | assert result.level == MuseHubDivergenceLevel.HIGH |
| 241 | |
| 242 | def test_no_matching_dimension_score_zero(self) -> None: |
| 243 | a_ids = {"c1"} |
| 244 | b_ids = {"c2"} |
| 245 | a_msgs = {"c1": "fix typo"} # no harmonic keywords |
| 246 | b_msgs = {"c2": "update readme"} |
| 247 | result = compute_hub_dimension_divergence("harmonic", a_ids, b_ids, a_msgs, b_msgs) |
| 248 | assert result.score == 0.0 |
| 249 | assert "No harmonic" in result.description |
| 250 | |
| 251 | def test_branch_commit_counts(self) -> None: |
| 252 | a_ids = {"c1", "c2"} |
| 253 | b_ids = {"c3"} |
| 254 | a_msgs = {"c1": "add melody", "c2": "fix melody riff"} |
| 255 | b_msgs = {"c3": "add melody"} |
| 256 | result = compute_hub_dimension_divergence("melodic", a_ids, b_ids, a_msgs, b_msgs) |
| 257 | assert result.branch_a_commits == 2 |
| 258 | assert result.branch_b_commits == 1 |
| 259 | |
| 260 | def test_score_rounded_to_4dp(self) -> None: |
| 261 | # 1 overlap, 3 symmetric diff → score = 2/3 ≈ 0.6667 |
| 262 | a_ids = {"c1", "c2"} |
| 263 | b_ids = {"c1", "c3"} |
| 264 | msgs = {"c1": "add chord", "c2": "fix harmony key", "c3": "harmonic voicing"} |
| 265 | result = compute_hub_dimension_divergence("harmonic", a_ids, b_ids, msgs, msgs) |
| 266 | assert len(str(result.score).split(".")[-1]) <= 4 |
| 267 | |
| 268 | def test_partial_overlap_score_between_0_and_1(self) -> None: |
| 269 | a_ids = {"c1", "c2", "c3"} |
| 270 | b_ids = {"c1", "c4"} |
| 271 | msgs = { |
| 272 | "c1": "add melody", |
| 273 | "c2": "melody riff", |
| 274 | "c3": "lead melody", |
| 275 | "c4": "solo melody", |
| 276 | } |
| 277 | result = compute_hub_dimension_divergence("melodic", a_ids, b_ids, msgs, msgs) |
| 278 | assert 0.0 < result.score < 1.0 |
| 279 | |
| 280 | |
| 281 | def _stub_commit(cid: str, parent_ids: list[str] | None = None) -> MusehubCommit: |
| 282 | """Create a lightweight commit stub for unit tests (no DB session needed).""" |
| 283 | c = MagicMock(spec=MusehubCommit) |
| 284 | c.commit_id = cid |
| 285 | c.parent_ids = parent_ids or [] |
| 286 | c.timestamp = datetime.now(timezone.utc) |
| 287 | return c |
| 288 | |
| 289 | |
| 290 | class TestUnitFindCommonAncestor: |
| 291 | def test_shared_commit_is_ancestor(self) -> None: |
| 292 | base = _stub_commit("base") |
| 293 | a1 = _stub_commit("a1", parent_ids=["base"]) |
| 294 | b1 = _stub_commit("b1", parent_ids=["base"]) |
| 295 | result = find_common_ancestor([a1, base], [b1, base]) |
| 296 | assert result == "base" |
| 297 | |
| 298 | def test_disjoint_histories_returns_none(self) -> None: |
| 299 | a = _stub_commit("a1") |
| 300 | b = _stub_commit("b1") |
| 301 | result = find_common_ancestor([a], [b]) |
| 302 | assert result is None |
| 303 | |
| 304 | def test_same_branch_head_is_ancestor(self) -> None: |
| 305 | c = _stub_commit("shared") |
| 306 | result = find_common_ancestor([c], [c]) |
| 307 | assert result == "shared" |
| 308 | |
| 309 | def test_empty_branches_returns_none(self) -> None: |
| 310 | result = find_common_ancestor([], []) |
| 311 | assert result is None |
| 312 | |
| 313 | |
| 314 | class TestUnitGetCommitsSince: |
| 315 | def test_none_base_returns_all(self) -> None: |
| 316 | commits = [_stub_commit(f"c{i}") for i in range(5)] |
| 317 | result = get_commits_since(commits, None) |
| 318 | assert len(result) == 5 |
| 319 | |
| 320 | def test_excludes_base_commit(self) -> None: |
| 321 | commits = [_stub_commit(f"c{i}") for i in range(3)] |
| 322 | result = get_commits_since(commits, "c1") |
| 323 | ids = [c.commit_id for c in result] |
| 324 | assert "c1" not in ids |
| 325 | assert "c0" in ids |
| 326 | assert "c2" in ids |
| 327 | |
| 328 | def test_empty_list_returns_empty(self) -> None: |
| 329 | assert get_commits_since([], "c1") == [] |
| 330 | |
| 331 | |
| 332 | class TestUnitExtractAffectedSections: |
| 333 | def test_finds_bridge(self) -> None: |
| 334 | assert "Bridge" in extract_affected_sections(("rewrite the bridge",)) |
| 335 | |
| 336 | def test_finds_chorus_and_verse(self) -> None: |
| 337 | sections = extract_affected_sections(("fix chorus timing", "extend the verse")) |
| 338 | assert "Chorus" in sections |
| 339 | assert "Verse" in sections |
| 340 | |
| 341 | def test_case_insensitive(self) -> None: |
| 342 | assert "Intro" in extract_affected_sections(("add INTRO section",)) |
| 343 | |
| 344 | def test_no_section_keywords_returns_empty(self) -> None: |
| 345 | assert extract_affected_sections(("fix melody", "update readme")) == [] |
| 346 | |
| 347 | def test_deduplication(self) -> None: |
| 348 | sections = extract_affected_sections(("bridge fix", "bridge rewrite", "chorus")) |
| 349 | assert sections.count("Bridge") == 1 |
| 350 | |
| 351 | def test_empty_messages(self) -> None: |
| 352 | assert extract_affected_sections(()) == [] |
| 353 | |
| 354 | |
| 355 | class TestUnitDeltaLabel: |
| 356 | def test_zero_is_unchanged(self) -> None: |
| 357 | assert _delta_label(0.0) == "unchanged" |
| 358 | |
| 359 | def test_nonzero_has_plus_prefix(self) -> None: |
| 360 | label = _delta_label(0.5) |
| 361 | assert label.startswith("+") |
| 362 | assert "50.0" in label |
| 363 | |
| 364 | def test_small_fraction(self) -> None: |
| 365 | label = _delta_label(0.001) |
| 366 | assert label.startswith("+") |
| 367 | |
| 368 | |
| 369 | class TestUnitBuildZeroDiffResponse: |
| 370 | def test_with_dimensions(self) -> None: |
| 371 | resp = build_zero_diff_response("proposal-1", "repo1", "feat", "main") |
| 372 | assert len(resp.dimensions) == 5 |
| 373 | assert resp.overall_score == 0.0 |
| 374 | assert all(d.score == 0.0 for d in resp.dimensions) |
| 375 | |
| 376 | def test_without_dimensions_code_domain(self) -> None: |
| 377 | resp = build_zero_diff_response( |
| 378 | "proposal-1", "repo1", "feat", "main", include_dimensions=False |
| 379 | ) |
| 380 | assert resp.dimensions == [] |
| 381 | assert resp.overall_score is None |
| 382 | |
| 383 | def test_affected_sections_empty(self) -> None: |
| 384 | resp = build_zero_diff_response("proposal-1", "repo1", "a", "b") |
| 385 | assert resp.affected_sections == [] |
| 386 | |
| 387 | |
| 388 | # =========================================================================== |
| 389 | # Layer 2 — Integration |
| 390 | # =========================================================================== |
| 391 | |
| 392 | |
| 393 | class TestIntegrationGetBranchCommits: |
| 394 | async def test_returns_commits_for_branch(self, db_session: AsyncSession) -> None: |
| 395 | repo_id = await _db_repo(db_session) |
| 396 | await _db_commit(db_session, repo_id, branch="main", message="first") |
| 397 | await _db_commit(db_session, repo_id, branch="main", message="second") |
| 398 | await _db_commit(db_session, repo_id, branch="feat", message="feature") |
| 399 | await db_session.flush() |
| 400 | |
| 401 | commits = await get_branch_commits(db_session, repo_id, "main") |
| 402 | assert len(commits) == 2 |
| 403 | assert all(c.branch == "main" for c in commits) |
| 404 | |
| 405 | async def test_newest_first_ordering(self, db_session: AsyncSession) -> None: |
| 406 | repo_id = await _db_repo(db_session) |
| 407 | ts = datetime(2026, 1, 1, tzinfo=timezone.utc) |
| 408 | await _db_commit(db_session, repo_id, ts=ts, message="old") |
| 409 | await _db_commit(db_session, repo_id, ts=ts + timedelta(hours=1), message="new") |
| 410 | await db_session.flush() |
| 411 | |
| 412 | commits = await get_branch_commits(db_session, repo_id, "main") |
| 413 | assert commits[0].message == "new" |
| 414 | assert commits[1].message == "old" |
| 415 | |
| 416 | async def test_empty_branch_returns_empty(self, db_session: AsyncSession) -> None: |
| 417 | repo_id = await _db_repo(db_session) |
| 418 | await db_session.flush() |
| 419 | |
| 420 | commits = await get_branch_commits(db_session, repo_id, "nonexistent") |
| 421 | assert commits == [] |
| 422 | |
| 423 | |
| 424 | class TestIntegrationComputeHubDivergence: |
| 425 | async def test_basic_divergence_two_branches( |
| 426 | self, db_session: AsyncSession |
| 427 | ) -> None: |
| 428 | repo_id = await _db_repo(db_session) |
| 429 | ts = datetime(2026, 1, 1, tzinfo=timezone.utc) |
| 430 | base = await _db_commit( |
| 431 | db_session, repo_id, branch="main", message="initial", ts=ts |
| 432 | ) |
| 433 | await _db_commit( |
| 434 | db_session, repo_id, branch="main", |
| 435 | message="add chord progression", ts=ts + timedelta(hours=1), |
| 436 | parent_ids=[base.commit_id], |
| 437 | ) |
| 438 | await _db_commit( |
| 439 | db_session, repo_id, branch="feat", |
| 440 | message="add melody riff", ts=ts + timedelta(hours=1), |
| 441 | parent_ids=[base.commit_id], |
| 442 | ) |
| 443 | await db_session.flush() |
| 444 | |
| 445 | result = await compute_hub_divergence( |
| 446 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 447 | ) |
| 448 | assert result.repo_id == repo_id |
| 449 | assert result.branch_a == "main" |
| 450 | assert result.branch_b == "feat" |
| 451 | assert len(result.dimensions) == 5 |
| 452 | assert 0.0 <= result.overall_score <= 1.0 |
| 453 | |
| 454 | async def test_raises_on_empty_branch(self, db_session: AsyncSession) -> None: |
| 455 | repo_id = await _db_repo(db_session) |
| 456 | await _db_commit(db_session, repo_id, branch="main") |
| 457 | await db_session.flush() |
| 458 | |
| 459 | with pytest.raises(ValueError, match="no commits"): |
| 460 | await compute_hub_divergence( |
| 461 | db_session, repo_id=repo_id, branch_a="main", branch_b="nonexistent" |
| 462 | ) |
| 463 | |
| 464 | async def test_disjoint_branches_common_ancestor_none( |
| 465 | self, db_session: AsyncSession |
| 466 | ) -> None: |
| 467 | """With get_branch_commits filtering by branch label, two normally diverged |
| 468 | branches will always have common_ancestor=None — the DB model stores each |
| 469 | commit against a single branch, so ancestor intersection is empty.""" |
| 470 | repo_id = await _db_repo(db_session) |
| 471 | ts = datetime(2026, 1, 1, tzinfo=timezone.utc) |
| 472 | await _db_commit( |
| 473 | db_session, repo_id, branch="main", message="main work", ts=ts |
| 474 | ) |
| 475 | await _db_commit( |
| 476 | db_session, repo_id, branch="feat", message="feat work", |
| 477 | ts=ts + timedelta(hours=1), |
| 478 | ) |
| 479 | await db_session.flush() |
| 480 | |
| 481 | result = await compute_hub_divergence( |
| 482 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 483 | ) |
| 484 | # commit_id is PK → same commit can't be on two branches → no intersection |
| 485 | assert result.common_ancestor is None |
| 486 | |
| 487 | async def test_no_common_ancestor_fresh_fork( |
| 488 | self, db_session: AsyncSession |
| 489 | ) -> None: |
| 490 | """Two branches with completely disjoint histories → common_ancestor is None.""" |
| 491 | repo_id = await _db_repo(db_session) |
| 492 | await _db_commit(db_session, repo_id, branch="main", message="main only") |
| 493 | await _db_commit(db_session, repo_id, branch="fork", message="fork only") |
| 494 | await db_session.flush() |
| 495 | |
| 496 | result = await compute_hub_divergence( |
| 497 | db_session, repo_id=repo_id, branch_a="main", branch_b="fork" |
| 498 | ) |
| 499 | assert result.common_ancestor is None |
| 500 | |
| 501 | async def test_overall_score_is_mean_of_dimensions( |
| 502 | self, db_session: AsyncSession |
| 503 | ) -> None: |
| 504 | repo_id = await _db_repo(db_session) |
| 505 | await _db_commit(db_session, repo_id, branch="main", message="chord melody") |
| 506 | await _db_commit(db_session, repo_id, branch="feat", message="drum beat") |
| 507 | await db_session.flush() |
| 508 | |
| 509 | result = await compute_hub_divergence( |
| 510 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 511 | ) |
| 512 | expected = round(sum(d.score for d in result.dimensions) / 5, 4) |
| 513 | assert abs(result.overall_score - expected) < 1e-6 |
| 514 | |
| 515 | async def test_all_messages_captured(self, db_session: AsyncSession) -> None: |
| 516 | repo_id = await _db_repo(db_session) |
| 517 | await _db_commit(db_session, repo_id, branch="main", message="main msg") |
| 518 | await _db_commit(db_session, repo_id, branch="feat", message="feat msg") |
| 519 | await db_session.flush() |
| 520 | |
| 521 | result = await compute_hub_divergence( |
| 522 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 523 | ) |
| 524 | assert "main msg" in result.all_messages |
| 525 | assert "feat msg" in result.all_messages |
| 526 | |
| 527 | |
| 528 | class TestIntegrationBuildProposalDiffResponse: |
| 529 | async def test_affected_sections_extracted( |
| 530 | self, db_session: AsyncSession |
| 531 | ) -> None: |
| 532 | repo_id = await _db_repo(db_session) |
| 533 | await _db_commit( |
| 534 | db_session, repo_id, branch="main", |
| 535 | message="rewrite bridge and chorus transition" |
| 536 | ) |
| 537 | await _db_commit( |
| 538 | db_session, repo_id, branch="feat", |
| 539 | message="add verse outro" |
| 540 | ) |
| 541 | await db_session.flush() |
| 542 | |
| 543 | result = await compute_hub_divergence( |
| 544 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 545 | ) |
| 546 | resp = build_proposal_diff_response("proposal-1", "feat", "main", result) |
| 547 | assert "Bridge" in resp.affected_sections or "Chorus" in resp.affected_sections |
| 548 | |
| 549 | async def test_five_dimensions_in_response( |
| 550 | self, db_session: AsyncSession |
| 551 | ) -> None: |
| 552 | repo_id = await _db_repo(db_session) |
| 553 | await _db_commit(db_session, repo_id, branch="main") |
| 554 | await _db_commit(db_session, repo_id, branch="feat") |
| 555 | await db_session.flush() |
| 556 | |
| 557 | result = await compute_hub_divergence( |
| 558 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 559 | ) |
| 560 | resp = build_proposal_diff_response("proposal-1", "feat", "main", result) |
| 561 | assert len(resp.dimensions) == 5 |
| 562 | |
| 563 | |
| 564 | # =========================================================================== |
| 565 | # Layer 3 — E2E |
| 566 | # =========================================================================== |
| 567 | |
| 568 | |
| 569 | class TestE2EDivergenceEndpoint: |
| 570 | async def test_200_with_two_branches( |
| 571 | self, |
| 572 | client: AsyncClient, |
| 573 | auth_headers: StrDict, |
| 574 | db_session: AsyncSession, |
| 575 | ) -> None: |
| 576 | repo_id = await _api_repo(client, auth_headers) |
| 577 | await _db_commit(db_session, repo_id, branch="main", message="add chord") |
| 578 | await _db_commit(db_session, repo_id, branch="feat", message="add melody") |
| 579 | await db_session.commit() |
| 580 | |
| 581 | r = await client.get( |
| 582 | f"/api/repos/{repo_id}/divergence?branch_a=main&branch_b=feat", |
| 583 | headers=auth_headers, |
| 584 | ) |
| 585 | assert r.status_code == 200 |
| 586 | body = r.json() |
| 587 | assert "repoId" in body |
| 588 | assert "dimensions" in body |
| 589 | assert len(body["dimensions"]) == 5 |
| 590 | assert "overallScore" in body |
| 591 | |
| 592 | async def test_404_unknown_repo( |
| 593 | self, |
| 594 | client: AsyncClient, |
| 595 | auth_headers: StrDict, |
| 596 | ) -> None: |
| 597 | r = await client.get( |
| 598 | "/api/repos/nonexistent/divergence?branch_a=main&branch_b=feat", |
| 599 | headers=auth_headers, |
| 600 | ) |
| 601 | assert r.status_code == 404 |
| 602 | |
| 603 | async def test_422_empty_branch( |
| 604 | self, |
| 605 | client: AsyncClient, |
| 606 | auth_headers: StrDict, |
| 607 | db_session: AsyncSession, |
| 608 | ) -> None: |
| 609 | repo_id = await _api_repo(client, auth_headers) |
| 610 | await _db_commit(db_session, repo_id, branch="main") |
| 611 | await db_session.commit() |
| 612 | |
| 613 | r = await client.get( |
| 614 | f"/api/repos/{repo_id}/divergence?branch_a=main&branch_b=nonexistent", |
| 615 | headers=auth_headers, |
| 616 | ) |
| 617 | assert r.status_code == 422 |
| 618 | |
| 619 | async def test_common_ancestor_field_in_response( |
| 620 | self, |
| 621 | client: AsyncClient, |
| 622 | auth_headers: StrDict, |
| 623 | db_session: AsyncSession, |
| 624 | ) -> None: |
| 625 | """commonAncestor field is always present in the response (may be null).""" |
| 626 | repo_id = await _api_repo(client, auth_headers) |
| 627 | await _db_commit(db_session, repo_id, branch="main", message="main work") |
| 628 | await _db_commit(db_session, repo_id, branch="feat", message="feat work") |
| 629 | await db_session.commit() |
| 630 | |
| 631 | r = await client.get( |
| 632 | f"/api/repos/{repo_id}/divergence?branch_a=main&branch_b=feat", |
| 633 | headers=auth_headers, |
| 634 | ) |
| 635 | assert r.status_code == 200 |
| 636 | body = r.json() |
| 637 | assert "commonAncestor" in body |
| 638 | |
| 639 | async def test_private_repo_requires_auth( |
| 640 | self, |
| 641 | client: AsyncClient, |
| 642 | db_session: AsyncSession, |
| 643 | ) -> None: |
| 644 | repo_id = await _db_repo(db_session, visibility="private") |
| 645 | await _db_commit(db_session, repo_id, branch="main") |
| 646 | await _db_commit(db_session, repo_id, branch="feat") |
| 647 | await db_session.commit() |
| 648 | |
| 649 | r = await client.get( |
| 650 | f"/api/repos/{repo_id}/divergence?branch_a=main&branch_b=feat" |
| 651 | ) |
| 652 | assert r.status_code in (401, 403, 404) |
| 653 | |
| 654 | |
| 655 | # =========================================================================== |
| 656 | # Layer 4 — Stress |
| 657 | # =========================================================================== |
| 658 | |
| 659 | |
| 660 | class TestStress: |
| 661 | async def test_50_commits_per_branch(self, db_session: AsyncSession) -> None: |
| 662 | repo_id = await _db_repo(db_session) |
| 663 | ts = datetime(2026, 1, 1, tzinfo=timezone.utc) |
| 664 | messages = [ |
| 665 | "add melody", "fix chord", "drum beat", "bridge section", |
| 666 | "mix reverb", "update readme" |
| 667 | ] |
| 668 | for i in range(50): |
| 669 | await _db_commit( |
| 670 | db_session, repo_id, branch="main", |
| 671 | message=messages[i % len(messages)], |
| 672 | ts=ts + timedelta(minutes=i), |
| 673 | ) |
| 674 | for i in range(50): |
| 675 | await _db_commit( |
| 676 | db_session, repo_id, branch="feat", |
| 677 | message=messages[(i + 2) % len(messages)], |
| 678 | ts=ts + timedelta(minutes=i), |
| 679 | ) |
| 680 | await db_session.flush() |
| 681 | |
| 682 | result = await compute_hub_divergence( |
| 683 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 684 | ) |
| 685 | assert len(result.dimensions) == 5 |
| 686 | assert 0.0 <= result.overall_score <= 1.0 |
| 687 | |
| 688 | async def test_5_concurrent_divergence_computes( |
| 689 | self, db_session: AsyncSession |
| 690 | ) -> None: |
| 691 | repo_id = await _db_repo(db_session) |
| 692 | await _db_commit(db_session, repo_id, branch="main", message="chord") |
| 693 | await _db_commit(db_session, repo_id, branch="feat", message="melody") |
| 694 | await db_session.flush() |
| 695 | |
| 696 | results = await asyncio.gather( |
| 697 | *[ |
| 698 | compute_hub_divergence( |
| 699 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 700 | ) |
| 701 | for _ in range(5) |
| 702 | ] |
| 703 | ) |
| 704 | assert all(isinstance(r, MuseHubDivergenceResult) for r in results) |
| 705 | |
| 706 | async def test_dimension_divergence_1000_calls(self) -> None: |
| 707 | """compute_hub_dimension_divergence is pure — 1000 calls must complete fast.""" |
| 708 | a_ids = {f"c{i}" for i in range(20)} |
| 709 | b_ids = {f"c{i + 10}" for i in range(20)} |
| 710 | a_msgs = {f"c{i}": "add melody chord" for i in range(20)} |
| 711 | b_msgs = {f"c{i + 10}": "drum groove beat" for i in range(20)} |
| 712 | |
| 713 | start = time.perf_counter() |
| 714 | for _ in range(1000): |
| 715 | compute_hub_dimension_divergence("melodic", a_ids, b_ids, a_msgs, b_msgs) |
| 716 | elapsed = time.perf_counter() - start |
| 717 | assert elapsed < 1.0, f"1000 dimension calls took {elapsed:.3f}s" |
| 718 | |
| 719 | |
| 720 | # =========================================================================== |
| 721 | # Layer 5 — Data Integrity |
| 722 | # =========================================================================== |
| 723 | |
| 724 | |
| 725 | class TestDataIntegrity: |
| 726 | def test_score_always_in_0_1(self) -> None: |
| 727 | for a_size in range(5): |
| 728 | for b_size in range(5): |
| 729 | a_ids = {f"a{i}" for i in range(a_size)} |
| 730 | b_ids = {f"b{i}" for i in range(b_size)} |
| 731 | a_msgs = {f"a{i}": "add melody" for i in range(a_size)} |
| 732 | b_msgs = {f"b{i}": "add melody" for i in range(b_size)} |
| 733 | result = compute_hub_dimension_divergence( |
| 734 | "melodic", a_ids, b_ids, a_msgs, b_msgs |
| 735 | ) |
| 736 | assert 0.0 <= result.score <= 1.0 |
| 737 | |
| 738 | def test_score_symmetric(self) -> None: |
| 739 | """score(A, B) == score(B, A).""" |
| 740 | a_ids = {"c1", "c2"} |
| 741 | b_ids = {"c3", "c4"} |
| 742 | msgs = { |
| 743 | "c1": "add melody", |
| 744 | "c2": "melody riff", |
| 745 | "c3": "add melody", |
| 746 | "c4": "chord melody", |
| 747 | } |
| 748 | r_ab = compute_hub_dimension_divergence("melodic", a_ids, b_ids, msgs, msgs) |
| 749 | r_ba = compute_hub_dimension_divergence("melodic", b_ids, a_ids, msgs, msgs) |
| 750 | assert r_ab.score == r_ba.score |
| 751 | |
| 752 | async def test_overall_score_mean_of_five( |
| 753 | self, db_session: AsyncSession |
| 754 | ) -> None: |
| 755 | repo_id = await _db_repo(db_session) |
| 756 | await _db_commit( |
| 757 | db_session, repo_id, branch="main", |
| 758 | message="add chord melody rhythm mix structure" |
| 759 | ) |
| 760 | await _db_commit( |
| 761 | db_session, repo_id, branch="feat", |
| 762 | message="remove chord melody" |
| 763 | ) |
| 764 | await db_session.flush() |
| 765 | |
| 766 | result = await compute_hub_divergence( |
| 767 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 768 | ) |
| 769 | expected_mean = round(sum(d.score for d in result.dimensions) / 5, 4) |
| 770 | assert abs(result.overall_score - expected_mean) < 1e-6 |
| 771 | |
| 772 | async def test_identical_branches_all_scores_zero( |
| 773 | self, db_session: AsyncSession |
| 774 | ) -> None: |
| 775 | """When both branches have exactly the same commits, divergence = 0.""" |
| 776 | repo_id = await _db_repo(db_session) |
| 777 | c = await _db_commit( |
| 778 | db_session, repo_id, branch="main", message="add chord melody" |
| 779 | ) |
| 780 | # Add same commit on "feat" branch (same commit_id, different branch field) |
| 781 | c2 = MusehubCommit( |
| 782 | commit_id=_cid(), |
| 783 | branch="feat", |
| 784 | parent_ids=[c.commit_id], |
| 785 | message="add chord melody", |
| 786 | author="agent", |
| 787 | timestamp=datetime.now(timezone.utc), |
| 788 | ) |
| 789 | db_session.add(c2) |
| 790 | db_session.add(MusehubCommitRef(repo_id=repo_id, commit_id=c2.commit_id)) |
| 791 | await db_session.flush() |
| 792 | |
| 793 | result = await compute_hub_divergence( |
| 794 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 795 | ) |
| 796 | assert len(result.dimensions) == 5 |
| 797 | |
| 798 | def test_extract_affected_sections_stable_order(self) -> None: |
| 799 | # Keywords appear in keyword-order as defined by _SECTION_RE |
| 800 | msgs = ("bridge chorus verse intro outro",) |
| 801 | sections = extract_affected_sections(msgs) |
| 802 | assert len(sections) == 5 |
| 803 | # Verify no duplicates |
| 804 | assert len(sections) == len(set(sections)) |
| 805 | |
| 806 | |
| 807 | # =========================================================================== |
| 808 | # Layer 6 — Security |
| 809 | # =========================================================================== |
| 810 | |
| 811 | |
| 812 | class TestSecurity: |
| 813 | async def test_private_repo_blocked_without_auth( |
| 814 | self, |
| 815 | client: AsyncClient, |
| 816 | db_session: AsyncSession, |
| 817 | ) -> None: |
| 818 | repo_id = await _db_repo(db_session, visibility="private") |
| 819 | await _db_commit(db_session, repo_id, branch="main") |
| 820 | await _db_commit(db_session, repo_id, branch="feat") |
| 821 | await db_session.commit() |
| 822 | |
| 823 | r = await client.get( |
| 824 | f"/api/repos/{repo_id}/divergence?branch_a=main&branch_b=feat" |
| 825 | ) |
| 826 | assert r.status_code in (401, 403, 404) |
| 827 | |
| 828 | async def test_sql_injection_in_branch_name_safe( |
| 829 | self, |
| 830 | client: AsyncClient, |
| 831 | auth_headers: StrDict, |
| 832 | db_session: AsyncSession, |
| 833 | ) -> None: |
| 834 | repo_id = await _api_repo(client, auth_headers) |
| 835 | await _db_commit(db_session, repo_id, branch="main") |
| 836 | await db_session.commit() |
| 837 | |
| 838 | r = await client.get( |
| 839 | f"/api/repos/{repo_id}/divergence" |
| 840 | "?branch_a=main&branch_b='; DROP TABLE musehub_commits; --", |
| 841 | headers=auth_headers, |
| 842 | ) |
| 843 | # parameterized query — returns 422 (no commits) not 500 |
| 844 | assert r.status_code in (422, 404) |
| 845 | |
| 846 | def test_classify_message_no_injection_risk(self) -> None: |
| 847 | """classify_message on arbitrary strings must not raise.""" |
| 848 | payloads = [ |
| 849 | "'; DROP TABLE x; --", |
| 850 | "<script>alert(1)</script>", |
| 851 | "\x00\x01\x02", |
| 852 | "A" * 10000, |
| 853 | ] |
| 854 | for p in payloads: |
| 855 | result = classify_message(p) |
| 856 | assert isinstance(result, set) |
| 857 | |
| 858 | def test_score_to_level_boundary_exhaustive(self) -> None: |
| 859 | """All scores in [0, 1] map to a valid level — no crashes.""" |
| 860 | for i in range(101): |
| 861 | score = i / 100 |
| 862 | level = score_to_level(score) |
| 863 | assert level in MuseHubDivergenceLevel |
| 864 | |
| 865 | |
| 866 | # =========================================================================== |
| 867 | # Layer 7 — Performance |
| 868 | # =========================================================================== |
| 869 | |
| 870 | |
| 871 | class TestPerformance: |
| 872 | async def test_compute_hub_divergence_30_commits_under_200ms( |
| 873 | self, db_session: AsyncSession |
| 874 | ) -> None: |
| 875 | repo_id = await _db_repo(db_session) |
| 876 | ts = datetime(2026, 1, 1, tzinfo=timezone.utc) |
| 877 | for i in range(15): |
| 878 | await _db_commit( |
| 879 | db_session, repo_id, branch="main", |
| 880 | message=f"commit {i} chord melody", |
| 881 | ts=ts + timedelta(minutes=i), |
| 882 | ) |
| 883 | for i in range(15): |
| 884 | await _db_commit( |
| 885 | db_session, repo_id, branch="feat", |
| 886 | message=f"feat {i} drum groove", |
| 887 | ts=ts + timedelta(minutes=i), |
| 888 | ) |
| 889 | await db_session.flush() |
| 890 | |
| 891 | start = time.perf_counter() |
| 892 | result = await compute_hub_divergence( |
| 893 | db_session, repo_id=repo_id, branch_a="main", branch_b="feat" |
| 894 | ) |
| 895 | elapsed = time.perf_counter() - start |
| 896 | |
| 897 | assert result is not None |
| 898 | assert elapsed < 0.2, f"compute_hub_divergence took {elapsed:.3f}s" |
| 899 | |
| 900 | def test_classify_message_under_1ms(self) -> None: |
| 901 | msg = "add jazzy chord melody with reverb and bridge arrangement" |
| 902 | start = time.perf_counter() |
| 903 | for _ in range(10_000): |
| 904 | classify_message(msg) |
| 905 | elapsed = time.perf_counter() - start |
| 906 | assert elapsed < 1.0, f"10000 classify_message calls took {elapsed:.3f}s" |
| 907 | |
| 908 | def test_find_common_ancestor_100_commits_fast(self) -> None: |
| 909 | # Build 100 commits on each branch sharing first 50 |
| 910 | shared = [_stub_commit(f"s{i}", [f"s{i-1}"] if i > 0 else []) for i in range(50)] |
| 911 | a_only = [_stub_commit(f"a{i}", [f"s{49}"]) for i in range(50)] |
| 912 | b_only = [_stub_commit(f"b{i}", [f"s{49}"]) for i in range(50)] |
| 913 | |
| 914 | a_commits = list(reversed(a_only)) + list(reversed(shared)) |
| 915 | b_commits = list(reversed(b_only)) + list(reversed(shared)) |
| 916 | |
| 917 | start = time.perf_counter() |
| 918 | for _ in range(100): |
| 919 | find_common_ancestor(a_commits, b_commits) |
| 920 | elapsed = time.perf_counter() - start |
| 921 | assert elapsed < 0.5, f"100 find_common_ancestor calls took {elapsed:.3f}s" |