test_merge_base_supercharge.py
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| 1 | """Supercharge tests for ``muse merge-base``. |
| 2 | |
| 3 | Coverage tiers |
| 4 | -------------- |
| 5 | - JSON envelope: exit_code and duration_ms present on found and not-found outcomes |
| 6 | - Error payload: errors go to stdout as JSON in --json mode, no dual stderr prose |
| 7 | - Data integrity: symmetry (A,B)==(B,A); merge-commit as input; deep DAG |
| 8 | - TypedDicts: _MergeBaseFoundJson and _MergeBaseErrorJson with required annotations |
| 9 | - Docstring: module docstring covers exit_code and duration_ms |
| 10 | - No-prose pollution: no emoji / prose leaks into JSON stdout |
| 11 | - Stress: 100-commit linear chain resolves correctly |
| 12 | """ |
| 13 | from __future__ import annotations |
| 14 | from collections.abc import Mapping |
| 15 | |
| 16 | import argparse |
| 17 | import datetime |
| 18 | import json |
| 19 | import pathlib |
| 20 | from typing import get_type_hints |
| 21 | |
| 22 | from muse.core.types import fake_id |
| 23 | from muse.core.ids import hash_commit as compute_commit_id, hash_snapshot as compute_snapshot_id |
| 24 | from muse.core.commits import ( |
| 25 | CommitRecord, |
| 26 | write_commit, |
| 27 | ) |
| 28 | from muse.core.snapshots import ( |
| 29 | SnapshotRecord, |
| 30 | write_snapshot, |
| 31 | ) |
| 32 | from muse.core.paths import head_path, muse_dir, ref_path |
| 33 | from tests.cli_test_helper import CliRunner, InvokeResult |
| 34 | |
| 35 | runner = CliRunner() |
| 36 | |
| 37 | _DT = datetime.datetime(2026, 1, 1, tzinfo=datetime.timezone.utc) |
| 38 | |
| 39 | |
| 40 | # --------------------------------------------------------------------------- |
| 41 | # Helpers |
| 42 | # --------------------------------------------------------------------------- |
| 43 | |
| 44 | |
| 45 | def _init_repo(tmp_path: pathlib.Path) -> pathlib.Path: |
| 46 | muse = muse_dir(tmp_path) |
| 47 | for sub in ("objects", "commits", "snapshots", "refs/heads"): |
| 48 | (muse / sub).mkdir(parents=True) |
| 49 | (muse / "HEAD").write_text("ref: refs/heads/main", encoding="utf-8") |
| 50 | (muse / "repo.json").write_text( |
| 51 | json.dumps({"repo_id": "supercharge-test", "domain": "code"}), |
| 52 | encoding="utf-8", |
| 53 | ) |
| 54 | return tmp_path |
| 55 | |
| 56 | |
| 57 | def _env(root: pathlib.Path) -> Mapping[str, str]: |
| 58 | return {"MUSE_REPO_ROOT": str(root)} |
| 59 | |
| 60 | |
| 61 | def _snap(root: pathlib.Path) -> str: |
| 62 | sid = compute_snapshot_id({}) |
| 63 | write_snapshot(root, SnapshotRecord(snapshot_id=sid, manifest={}, created_at=_DT)) |
| 64 | return sid |
| 65 | |
| 66 | |
| 67 | def _commit( |
| 68 | root: pathlib.Path, |
| 69 | msg: str, |
| 70 | *, |
| 71 | parent: str | None = None, |
| 72 | parent2: str | None = None, |
| 73 | branch: str = "main", |
| 74 | ) -> str: |
| 75 | sid = _snap(root) |
| 76 | parent_ids = [p for p in [parent, parent2] if p is not None] |
| 77 | cid = compute_commit_id( |
| 78 | parent_ids=parent_ids, |
| 79 | snapshot_id=sid, |
| 80 | message=msg, |
| 81 | committed_at_iso=_DT.isoformat(), |
| 82 | ) |
| 83 | write_commit(root, CommitRecord( |
| 84 | commit_id=cid, |
| 85 | branch=branch, |
| 86 | snapshot_id=sid, |
| 87 | message=msg, |
| 88 | committed_at=_DT, |
| 89 | parent_commit_id=parent, |
| 90 | parent2_commit_id=parent2, |
| 91 | )) |
| 92 | return cid |
| 93 | |
| 94 | |
| 95 | def _set_branch(root: pathlib.Path, branch: str, cid: str) -> None: |
| 96 | ref = ref_path(root, branch) |
| 97 | ref.parent.mkdir(parents=True, exist_ok=True) |
| 98 | ref.write_text(cid, encoding="utf-8") |
| 99 | (head_path(root)).write_text(f"ref: refs/heads/{branch}", encoding="utf-8") |
| 100 | |
| 101 | |
| 102 | def _mb(root: pathlib.Path, *args: str) -> InvokeResult: |
| 103 | from muse.cli.app import main as cli |
| 104 | return runner.invoke(cli, ["merge-base", *args], env=_env(root)) |
| 105 | |
| 106 | |
| 107 | def _mbj(root: pathlib.Path, *args: str) -> InvokeResult: |
| 108 | """Like _mb but always passes --json.""" |
| 109 | return _mb(root, "--json", *args) |
| 110 | |
| 111 | |
| 112 | def _diverged_repo(root: pathlib.Path) -> tuple[str, str, str]: |
| 113 | """Create base → left and base → right. Returns (base, left, right).""" |
| 114 | base = _commit(root, "base") |
| 115 | left = _commit(root, "left", parent=base, branch="left") |
| 116 | right = _commit(root, "right", parent=base, branch="right") |
| 117 | _set_branch(root, "left", left) |
| 118 | _set_branch(root, "right", right) |
| 119 | return base, left, right |
| 120 | |
| 121 | |
| 122 | def _unrelated_repo(root: pathlib.Path) -> tuple[str, str]: |
| 123 | """Two commits with no shared history.""" |
| 124 | c1 = _commit(root, "unrelated-c1") |
| 125 | c2 = _commit(root, "unrelated-c2") |
| 126 | return c1, c2 |
| 127 | |
| 128 | |
| 129 | # --------------------------------------------------------------------------- |
| 130 | # JSON envelope — exit_code |
| 131 | # --------------------------------------------------------------------------- |
| 132 | |
| 133 | |
| 134 | class TestJsonEnvelopeExitCode: |
| 135 | """exit_code is present and correct on all merge-base outcomes.""" |
| 136 | |
| 137 | def test_found_has_exit_code(self, tmp_path: pathlib.Path) -> None: |
| 138 | root = _init_repo(tmp_path) |
| 139 | base, left, right = _diverged_repo(root) |
| 140 | r = _mbj(root, left, right) |
| 141 | assert r.exit_code == 0 |
| 142 | d = json.loads(r.output) |
| 143 | assert "exit_code" in d, "exit_code missing when merge base is found" |
| 144 | assert d["exit_code"] == 0 |
| 145 | |
| 146 | def test_not_found_has_exit_code(self, tmp_path: pathlib.Path) -> None: |
| 147 | root = _init_repo(tmp_path) |
| 148 | c1, c2 = _unrelated_repo(root) |
| 149 | r = _mbj(root, c1, c2) |
| 150 | assert r.exit_code == 0 |
| 151 | d = json.loads(r.output) |
| 152 | assert "exit_code" in d, "exit_code missing when no common ancestor" |
| 153 | assert d["exit_code"] == 0 |
| 154 | |
| 155 | def test_same_commit_has_exit_code(self, tmp_path: pathlib.Path) -> None: |
| 156 | root = _init_repo(tmp_path) |
| 157 | cid = _commit(root, "solo") |
| 158 | r = _mbj(root, cid, cid) |
| 159 | d = json.loads(r.output) |
| 160 | assert "exit_code" in d |
| 161 | assert d["exit_code"] == 0 |
| 162 | |
| 163 | |
| 164 | # --------------------------------------------------------------------------- |
| 165 | # JSON envelope — duration_ms |
| 166 | # --------------------------------------------------------------------------- |
| 167 | |
| 168 | |
| 169 | class TestJsonEnvelopeDurationMs: |
| 170 | """duration_ms is present and non-negative on all merge-base outcomes.""" |
| 171 | |
| 172 | def test_found_has_duration_ms(self, tmp_path: pathlib.Path) -> None: |
| 173 | root = _init_repo(tmp_path) |
| 174 | base, left, right = _diverged_repo(root) |
| 175 | r = _mbj(root, left, right) |
| 176 | d = json.loads(r.output) |
| 177 | assert "duration_ms" in d, "duration_ms missing when merge base is found" |
| 178 | assert isinstance(d["duration_ms"], float) |
| 179 | assert d["duration_ms"] >= 0.0 |
| 180 | |
| 181 | def test_not_found_has_duration_ms(self, tmp_path: pathlib.Path) -> None: |
| 182 | root = _init_repo(tmp_path) |
| 183 | c1, c2 = _unrelated_repo(root) |
| 184 | r = _mbj(root, c1, c2) |
| 185 | d = json.loads(r.output) |
| 186 | assert "duration_ms" in d, "duration_ms missing when no common ancestor" |
| 187 | assert isinstance(d["duration_ms"], float) |
| 188 | |
| 189 | def test_same_commit_has_duration_ms(self, tmp_path: pathlib.Path) -> None: |
| 190 | root = _init_repo(tmp_path) |
| 191 | cid = _commit(root, "dur-solo") |
| 192 | r = _mbj(root, cid, cid) |
| 193 | d = json.loads(r.output) |
| 194 | assert "duration_ms" in d |
| 195 | assert isinstance(d["duration_ms"], float) |
| 196 | |
| 197 | |
| 198 | # --------------------------------------------------------------------------- |
| 199 | # Error payload — errors route to stdout as JSON in --json mode |
| 200 | # --------------------------------------------------------------------------- |
| 201 | |
| 202 | |
| 203 | class TestErrorPayload: |
| 204 | """In --json mode, all errors appear on stdout as JSON — no stderr prose.""" |
| 205 | |
| 206 | def test_bad_ref_error_is_json_on_stdout(self, tmp_path: pathlib.Path) -> None: |
| 207 | root = _init_repo(tmp_path) |
| 208 | r = _mbj(root, "no-such-branch", "also-missing") |
| 209 | assert r.exit_code != 0 |
| 210 | # Error JSON must go to stdout: stderr should be empty. |
| 211 | assert not r.stderr.strip(), f"unexpected stderr: {r.stderr!r}" |
| 212 | d = json.loads(r.output) |
| 213 | assert d["status"] == "error" |
| 214 | |
| 215 | def test_bad_ref_error_has_status_error(self, tmp_path: pathlib.Path) -> None: |
| 216 | root = _init_repo(tmp_path) |
| 217 | r = _mbj(root, "ghost", "phantom") |
| 218 | d = json.loads(r.output) |
| 219 | assert d["status"] == "error" |
| 220 | |
| 221 | def test_bad_ref_error_has_exit_code(self, tmp_path: pathlib.Path) -> None: |
| 222 | root = _init_repo(tmp_path) |
| 223 | r = _mbj(root, "ghost", "phantom") |
| 224 | d = json.loads(r.output) |
| 225 | assert "exit_code" in d |
| 226 | assert d["exit_code"] != 0 |
| 227 | |
| 228 | def test_bad_ref_error_has_error_field(self, tmp_path: pathlib.Path) -> None: |
| 229 | root = _init_repo(tmp_path) |
| 230 | r = _mbj(root, "ghost", "phantom") |
| 231 | d = json.loads(r.output) |
| 232 | assert "error" in d |
| 233 | assert d["error"] # non-empty message |
| 234 | |
| 235 | def test_no_duplicate_stderr_prose(self, tmp_path: pathlib.Path) -> None: |
| 236 | """In --json mode, errors must not also print ❌ prose to stderr.""" |
| 237 | root = _init_repo(tmp_path) |
| 238 | r = _mbj(root, "no-such", "branch") |
| 239 | assert "❌" not in r.stderr |
| 240 | |
| 241 | def test_second_bad_ref_error_is_json_on_stdout(self, tmp_path: pathlib.Path) -> None: |
| 242 | """Error on second ref (commit_b) also goes to stdout, not stderr.""" |
| 243 | root = _init_repo(tmp_path) |
| 244 | cid = _commit(root, "real-commit") |
| 245 | r = _mbj(root, cid, "nonexistent") |
| 246 | assert r.exit_code != 0 |
| 247 | assert not r.stderr.strip(), f"unexpected stderr: {r.stderr!r}" |
| 248 | d = json.loads(r.output) |
| 249 | assert d["status"] == "error" |
| 250 | |
| 251 | |
| 252 | # --------------------------------------------------------------------------- |
| 253 | # Data integrity |
| 254 | # --------------------------------------------------------------------------- |
| 255 | |
| 256 | |
| 257 | class TestDataIntegrity: |
| 258 | """Correctness properties that must hold across all inputs.""" |
| 259 | |
| 260 | def test_symmetry(self, tmp_path: pathlib.Path) -> None: |
| 261 | """merge-base(A, B) == merge-base(B, A).""" |
| 262 | root = _init_repo(tmp_path) |
| 263 | base, left, right = _diverged_repo(root) |
| 264 | r_ab = json.loads(_mbj(root, left, right).output) |
| 265 | r_ba = json.loads(_mbj(root, right, left).output) |
| 266 | assert r_ab["merge_base"] == r_ba["merge_base"] |
| 267 | |
| 268 | def test_merge_commit_as_input(self, tmp_path: pathlib.Path) -> None: |
| 269 | """A merge commit (two parents) is handled correctly as input.""" |
| 270 | root = _init_repo(tmp_path) |
| 271 | base, left, right = _diverged_repo(root) |
| 272 | # Simulate a merge commit that has both left and right as parents |
| 273 | merge_commit = _commit(root, "merge", parent=left, parent2=right, branch="main") |
| 274 | _set_branch(root, "main", merge_commit) |
| 275 | # merge-base of the merge commit with right should be right (right is ancestor of merge) |
| 276 | r = _mbj(root, merge_commit, right) |
| 277 | assert r.exit_code == 0 |
| 278 | d = json.loads(r.output) |
| 279 | assert d["merge_base"] == right |
| 280 | |
| 281 | def test_found_merge_base_is_correct(self, tmp_path: pathlib.Path) -> None: |
| 282 | """merge_base field equals the actual LCA commit ID.""" |
| 283 | root = _init_repo(tmp_path) |
| 284 | base, left, right = _diverged_repo(root) |
| 285 | d = json.loads(_mbj(root, left, right).output) |
| 286 | assert d["merge_base"] == base |
| 287 | |
| 288 | def test_commit_a_and_b_echoed_correctly(self, tmp_path: pathlib.Path) -> None: |
| 289 | """commit_a and commit_b in the response match what was requested.""" |
| 290 | root = _init_repo(tmp_path) |
| 291 | base, left, right = _diverged_repo(root) |
| 292 | d = json.loads(_mbj(root, left, right).output) |
| 293 | assert d["commit_a"] == left |
| 294 | assert d["commit_b"] == right |
| 295 | |
| 296 | def test_not_found_merge_base_is_null(self, tmp_path: pathlib.Path) -> None: |
| 297 | """merge_base is null (not absent) when no common ancestor.""" |
| 298 | root = _init_repo(tmp_path) |
| 299 | c1, c2 = _unrelated_repo(root) |
| 300 | d = json.loads(_mbj(root, c1, c2).output) |
| 301 | assert "merge_base" in d |
| 302 | assert d["merge_base"] is None |
| 303 | |
| 304 | |
| 305 | # --------------------------------------------------------------------------- |
| 306 | # No-prose pollution |
| 307 | # --------------------------------------------------------------------------- |
| 308 | |
| 309 | |
| 310 | class TestNoProsePollution: |
| 311 | """JSON stdout must be valid, parseable JSON on all non-error paths.""" |
| 312 | |
| 313 | def test_found_stdout_is_valid_json(self, tmp_path: pathlib.Path) -> None: |
| 314 | root = _init_repo(tmp_path) |
| 315 | base, left, right = _diverged_repo(root) |
| 316 | r = _mbj(root, left, right) |
| 317 | json.loads(r.output) # must not raise |
| 318 | |
| 319 | def test_not_found_stdout_is_valid_json(self, tmp_path: pathlib.Path) -> None: |
| 320 | root = _init_repo(tmp_path) |
| 321 | c1, c2 = _unrelated_repo(root) |
| 322 | json.loads(_mbj(root, c1, c2).output) # must not raise |
| 323 | |
| 324 | def test_no_emoji_in_found_json(self, tmp_path: pathlib.Path) -> None: |
| 325 | root = _init_repo(tmp_path) |
| 326 | base, left, right = _diverged_repo(root) |
| 327 | r = _mbj(root, left, right) |
| 328 | assert "✅" not in r.output |
| 329 | assert "❌" not in r.output |
| 330 | |
| 331 | |
| 332 | # --------------------------------------------------------------------------- |
| 333 | # TypedDicts |
| 334 | # --------------------------------------------------------------------------- |
| 335 | |
| 336 | |
| 337 | class TestTypedDicts: |
| 338 | def test_merge_base_found_json_typeddict_exists(self) -> None: |
| 339 | from muse.cli.commands.merge_base import _MergeBaseFoundJson |
| 340 | assert _MergeBaseFoundJson is not None |
| 341 | |
| 342 | def test_merge_base_error_json_typeddict_exists(self) -> None: |
| 343 | from muse.cli.commands.merge_base import _MergeBaseErrorJson |
| 344 | assert _MergeBaseErrorJson is not None |
| 345 | |
| 346 | def test_merge_base_found_json_has_exit_code_annotation(self) -> None: |
| 347 | from muse.cli.commands.merge_base import _MergeBaseFoundJson |
| 348 | hints = get_type_hints(_MergeBaseFoundJson) |
| 349 | assert "exit_code" in hints |
| 350 | |
| 351 | def test_merge_base_found_json_has_duration_ms_annotation(self) -> None: |
| 352 | from muse.cli.commands.merge_base import _MergeBaseFoundJson |
| 353 | hints = get_type_hints(_MergeBaseFoundJson) |
| 354 | assert "duration_ms" in hints |
| 355 | |
| 356 | def test_merge_base_error_json_has_required_fields(self) -> None: |
| 357 | from muse.cli.commands.merge_base import _MergeBaseErrorJson |
| 358 | hints = get_type_hints(_MergeBaseErrorJson) |
| 359 | for field in ("status", "error", "exit_code"): |
| 360 | assert field in hints, f"Missing annotation: {field!r}" |
| 361 | |
| 362 | |
| 363 | # --------------------------------------------------------------------------- |
| 364 | # Docstring coverage |
| 365 | # --------------------------------------------------------------------------- |
| 366 | |
| 367 | |
| 368 | class TestDocstring: |
| 369 | def _doc(self) -> str: |
| 370 | import muse.cli.commands.merge_base as mod |
| 371 | return mod.__doc__ or "" |
| 372 | |
| 373 | def test_docstring_documents_exit_code(self) -> None: |
| 374 | assert "exit_code" in self._doc() |
| 375 | |
| 376 | def test_docstring_documents_duration_ms(self) -> None: |
| 377 | assert "duration_ms" in self._doc() |
| 378 | |
| 379 | |
| 380 | # --------------------------------------------------------------------------- |
| 381 | # Stress |
| 382 | # --------------------------------------------------------------------------- |
| 383 | |
| 384 | |
| 385 | class TestStress: |
| 386 | def test_100_commit_linear_chain(self, tmp_path: pathlib.Path) -> None: |
| 387 | """100-commit chain: merge-base of tip and midpoint is the midpoint.""" |
| 388 | root = _init_repo(tmp_path) |
| 389 | commits: list[str] = [] |
| 390 | for i in range(100): |
| 391 | parent = commits[-1] if commits else None |
| 392 | cid = _commit(root, f"chain-{i:03d}", parent=parent) |
| 393 | commits.append(cid) |
| 394 | mid = commits[49] |
| 395 | tip = commits[-1] |
| 396 | r = _mbj(root, tip, mid) |
| 397 | assert r.exit_code == 0 |
| 398 | d = json.loads(r.output) |
| 399 | assert d["merge_base"] == mid |
| 400 | assert "duration_ms" in d |
| 401 | assert "exit_code" in d |
| 402 | |
| 403 | |
| 404 | class TestRegisterFlags: |
| 405 | def _parse(self, *args: str) -> "argparse.Namespace": |
| 406 | import argparse |
| 407 | from muse.cli.commands.merge_base import register |
| 408 | p = argparse.ArgumentParser() |
| 409 | subs = p.add_subparsers() |
| 410 | register(subs) |
| 411 | return p.parse_args(["merge-base", fake_id("a"), fake_id("b"), *args]) |
| 412 | |
| 413 | def test_json_short_flag(self) -> None: |
| 414 | args = self._parse("-j") |
| 415 | assert args.json_out is True |
| 416 | |
| 417 | def test_json_long_flag(self) -> None: |
| 418 | args = self._parse("--json") |
| 419 | assert args.json_out is True |
| 420 | |
| 421 | def test_default_no_json(self) -> None: |
| 422 | args = self._parse() |
| 423 | assert args.json_out is False |