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test(install): speed up bun-install-git-deps.test.ts and tighten its assertions - #39737
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…assertions Build each fixture repo with one git fast-import instead of a checkout, add, commit and push per branch, build the shared 16-branch repo once in beforeAll for the tests that only read it, and build the tarball fixtures in memory with Bun.Archive. The file spawns 13 fixture processes instead of 139. Every install now checks bun's stdout line by line (the commit or tarball each package resolved to), its stderr, the installed markers and the bun.lock rows as whole objects, and the tarball tests check that each tarball is downloaded once.
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Status: test-only change, ready for review. PR: #39737 (branch Measured with the old and the new file run alternately on the same machine. Windows 11 aarch64: 21s to 22s before, 11.6s to 11.9s after with a debug build ( Commits: f33a5e5 is the rewrite. c0dd54e sorts the expected lines (review). 635fe1f, from a self-review, gives the helpers the shapes that #38816, #38681 (in #39403) and #35566 need, so those PRs rebase onto this one without a second rewrite of their fixtures. |
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Included review availability: Your plan provides up to 5 included reviews per hour; 2 remain after this review. WalkthroughThe test fixture now shares Git repository, archive, project, output, installation, and lockfile helpers. Tests cover tarball, GitHub, Git, frozen-lockfile, moved-branch, ChangesGit dependency install test coverage
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Inline comments:
In `@test/cli/install/bun-install-git-deps.test.ts`:
- Around line 195-204: Update expectInstalled to sort the resolution names
alphabetically before mapping them to expected “+ name@resolution” lines, while
preserving the existing count and output assertions.
- Around line 214-219: Update installedVersionOf to compare the installed file’s
complete text directly with the fixture generator output from indexJs, rather
than extracting and JSON-parsing a substring. Preserve the null return when the
file is absent, and make the comparison identify the package/file and expected
versus actual contents when it fails.
- Around line 80-94: Update commitTo so non-extend commits cannot target an
already-existing branch: before emitting each commit, detect the branch’s prior
existence and reject that fixture state explicitly, while preserving extend
commits’ existing from refs/heads/<branch>^0 behavior.
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test/cli/install/bun-install-git-deps.test.ts
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LGTM — test-only refactor that speeds up fixture setup and strictly tightens assertions.
What was reviewed:
- Shared
beforeAllfixture is read-only; the two branch-mutating tests correctly build their own repo, sotest.concurrentcan't race on it. git fast-importstream construction (byte-lengthdatablocks,from refs/heads/<branch>^0for extend) andinfo/refsparsing match git's format.Bun.Archivewrites the leading${dir}/entry as a regular-file header, but the GitHub extractor reads only the first path component of the first entry regardless of type (TarballStream.rs:744-770), so the resolved-tag path is preserved.- Every assertion is stronger than before (exact stdout/stderr/bun.lock/download-count vs
not.toContain); no existing coverage weakened.afterAllcleans up server + tempdir with?.guards.
Extended reasoning...
Overview
This PR refactors a single test file, test/cli/install/bun-install-git-deps.test.ts. It replaces per-branch git checkout/add/commit/push fixture creation (~139 subprocesses) with a single git fast-import per repo (~13 subprocesses total), moves the read-only 16-branch repo into a beforeAll shared across three tests, and replaces tar -czf subprocess calls with in-memory Bun.Archive. Every install now asserts exact stdout (per-package resolution lines), stderr (inline snapshot of task counts), installed markers, and bun.lock rows — replacing the previous bare not.toContain("error:") + exit-code checks. No production code is touched.
Security risks
None. Test-only change; no auth, crypto, or user-facing surface. The local Bun.serve fixtures serve only from a per-test temp directory or an in-memory map keyed by regex-matched letter.
Level of scrutiny
Medium — the diff is ~300 lines, but it is test infrastructure with no runtime impact. The scenarios exercised are explicitly unchanged (16 branches, 11 duplicated specs, two cold attempts, both linkers), and the PR description documents 10/10 passing runs on Linux debug+ASAN plus Windows aarch64 timings. The main things worth checking were (a) concurrent-test safety of the shared fixture, (b) that the Bun.Archive-built tarballs still satisfy the GitHub extractor's first-entry contract, and (c) that assertion order (Object.keys insertion order) matches bun install's name-sorted output. All three hold.
Other factors
The change follows repo test guidance closely: tempDir/bunEnv/normalizeBunSnapshot from harness, port: 0, per-test cache dirs, await using for servers, exit-code asserted last, no external network. Assertions are strictly tightened rather than loosened (aligned with the "assert the strongest invariant" rule), and the download-dedup check adds new coverage for the property the tests exist to protect. If any of the new inline snapshots are off they will fail loudly in CI, which is easily revertible. No prior review comments exist on the timeline.
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LGTM — test-only refactor that halves the file's wall time and replaces bare exit-code checks with exact stdout/stderr/bun.lock/marker assertions.
What was reviewed:
- Shared
beforeAllfixture withtest.concurrent: the three tests readingsharedBare/sharedServerare read-only; the moved-branch tests build their own repo, so no cross-test interference. git fast-importstream construction (commitTo,fastImportDatabyte-length prefix,from refs/heads/<branch>^0for extend) — matches git's documented format.- Removed per-attempt
rm -rf cache-N: each attempt uses a fresh cache path inside a freshtempDir, so the old removal was a no-op. downloadsarray mutation from the serve handler is single-threaded;.sort()before comparing tolettershandles request ordering.
Extended reasoning...
Overview
Single-file change to test/cli/install/bun-install-git-deps.test.ts. The fixture layer is rewritten: makeSharedRepo now writes all branches with one git fast-import instead of a checkout/add/commit/push per branch, tarballs are built in memory with Bun.Archive instead of shelling to tar, and the 16-branch repo is built once in beforeAll and shared read-only across the three tests that don't mutate it. Every install now asserts stdout (per-package resolution lines), stderr (inline snapshot with task count), the installed markers as one object, and the bun.lock packages rows. The tarball tests additionally assert each tarball is downloaded exactly once. Test scenarios (16 branches, 11 duplicated specs, two cold attempts, both linkers) are unchanged. No production code is touched.
Security risks
None. Test-only; no auth, crypto, or permissions code. The fixtures are local (port: 0 servers, bare repos in tempDir, git+file:// to a local path).
Level of scrutiny
Medium — it's a ~400-line test refactor, not a config tweak, but the blast radius is one test file. The author verified 10/10 passes on Linux debug+ASAN and on Windows 11 aarch64 (debug and release), with measured before/after timings. All three CodeRabbit nits are resolved (one applied in c0dd54e, two declined with sound reasoning — git already rejects the invalid state, and installedVersionOf is unchanged from the old file).
Other factors
I traced the shared-fixture concurrency: sharedBare/sharedServer are only read (dumb-HTTP static file serving and git clone); the moved-branch tests call makeSharedRepo on their own tempDir. Each test uses its own project dir and cache dir, so test.concurrent is safe. The git+file:// test now points at sharedBare and depends only on pkg-b, which has no transitive dependencies, so the [2] task count and single lock row are correct. toMatchInlineSnapshot inside the two-attempt loop compares against an already-populated literal both times, which is fine when both attempts produce identical output. The PR description notes that open PR #35566 will need to switch from the removed work tree to moveBranch/commitTo on rebase — that's disclosed and expected for a fixture refactor. No CODEOWNERS entry covers this path.
…pen PRs use BranchPackage gets the optional name and files fields and makeSharedRepo the repoName parameter that #38816 and #38681 add (both are in #39403). Commit names its ref in full and takes an explicit parent, so a commit can land on a tag or start a branch from another one, which is what the cases in #35566 need. The tarball builder is split so that the GitHub shaped part has the signature of the githubTarball helper in #39115.
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LGTM — test-only refactor that speeds up fixture setup and strictly tightens assertions.
What was reviewed:
- Fixture correctness:
git fast-importstream (byte-lengthdataprefix,from ref^0, fixed committer date),Bun.Archivewithcompress: "gzip"and trailing-/directory entry,Bun.JSONC.parse— all match documented/existing usage. - Shared
beforeAllfixture is read-only for the concurrent tests that use it; the two mutating tests build their own repo;afterAllguards with?.. - Every assertion is stronger than before (full stdout/stderr/bun.lock/download-count vs. old
not.toContain+ exit code); no coverage weakened. - All three review threads resolved (sort applied in c0dd54e; two withdrawn).
Extended reasoning...
Overview
This PR rewrites test/cli/install/bun-install-git-deps.test.ts to (1) build fixture repos via a single git fast-import instead of ~139 individual checkout/add/commit/push processes, (2) build tarballs in memory with Bun.Archive instead of shelling out to tar, (3) hoist a read-only 16-branch repo + static server into beforeAll for the three tests that only read it, and (4) replace bare not.toContain("error:") + exit-code checks with full assertions on stdout (+ name@resolution lines), stderr (inline snapshot), installed markers, bun.lock rows, and per-tarball download counts. Measured: 22s→12s Windows debug, 20s→11s Windows release, 5.0s→4.0s Linux ASAN; 139→13 fixture processes. Verified 10/10 Linux + 8 Windows runs.
Security risks
None. Test-only change; no production code, auth, or crypto touched. All servers are local Bun.serve({ port: 0 }); no external network.
Level of scrutiny
Medium-low. It's a test refactor, but a substantial one (~400 lines net) touching regression coverage for five install-race issues (#35420, #10915, #8501, #11348, #28284). The key question is whether coverage was preserved — it was, and every assertion is now strictly stronger: exact stderr snapshots, exact stdout resolution lines (sorted, per c0dd54e), full bun.lock package rows including integrity hashes, and download-dedup counts that directly test the behavior the tests exist for. The scenarios (16 branches, 11 duplicated specs, two cold attempts, both linkers, moved-branch) are unchanged.
Other factors
- The shared fixture is safe under
test.concurrent: it's a stateless static-file server over a read-only bare repo; the two tests that mutate a repo (moveBranch) build their own.afterAlluses?.to handle partialbeforeAllfailure. - The
fast-importstream is correct:data <byteLength>usesBuffer.byteLength, committer date is fixed at0 +0000for deterministic SHAs (though tests still read them frominfo/refs), andfrom ref^0correctly resolves against the repo per git docs. Bun.Archive({ compress: "gzip" }).bytes()andBun.JSONC.parseare documented APIs used elsewhere intest/;.bytes()is async and correctly awaited.- All three CodeRabbit threads are resolved: the
expectInstalledsort landed in c0dd54e; thecommitToguard andinstalledVersionOfparsing suggestions were withdrawn with sound reasoning (git already rejects the invalid state; the helper is unchanged and callers get a keyed diff). - Commit 635fe1f keeps helper signatures compatible with three open PRs (#38816, #35566, #38681) that add cases to this file.
Problem
checkout,add,commitandpushper branch, a repo per test.Fix
makeSharedRepowrites all branches with onegit fast-import. The 16-branch repo is built once inbeforeAllfor the three tests that only read it. The two that move a branch build their own.Bun.Archivebuilds the tarballs. 13 fixture processes remain.name?,files?andrepoName(install: keep file: folder paths declared by git and tarball packages relative to the package #38816 and install: name folder, tarball and git packages without a package.json name after their source #38681, in install: fold the open bun install / pm / pack+publish PRs into one branch (171 PRs) #39403), and aCommitwith an explicit ref and parent (the tag cases of install: fetch new tags/branches when updating a cached git dependency #35566). Checks in Notes.bun bd test test/cli/install/bun-install-git-deps.test.ts, 15 of 15 Linux runs. Windows 11 aarch64: 22s to 12s debug, 20s to 11s release (Notes).Background
update-server-infowritesinfo/refs, the branch tips the tests read as expected commits.git fast-importwrites a stream of commits, file contents inline, to any refs in one process.from <ref>^0parents a commit on the ref as the repo has it.github:dependency bun reads the resolved committish off the tarball's first entry, the<owner>-<repo>-<committish>directory.Bun.Archivewrites a key ending in/as that entry.Notes
Open PRs that touch this file. This PR can land before or after them. What each order costs:
name?,files?andrepoName, five tests, atarbasedpackTarballand awriteProjectidentical to the one here. Merging it onto this PR conflicts in the helper region (take this PR's) and duplicateswriteProject(delete one). Checked: this PR's helpers with the fold's five tests appended run all 12 tests. This PR's 7 pass. The fold's 5 build their fixtures (thefilesof thefile:test, the unnamed package, theodd@repo.gitname) and fail only on the assertions its source changes make pass, for example the lockfile nameodd@repo.git@...instead ofunnamed-package@....commitOn,pushRefandinstalledFromBranch, which drive a work tree that no longer exists, plus 8 tests. On this PR they becomemoveBranchorcommitTocalls andgit tag/git branchin the bare repo. Checked with a scratch test:git tag v1 main, a commit that onlyrefs/tags/v2reaches,refs/heads/release/2.0started frommain, andv1moved to a new commit, in 3fast-importruns.mainkept its commit, andbun installof#main,#v2,#release/2.0and#v1installedmain,main-v2,release-2.0andv1-moved.githubTarball(rootDir, files)to the harness, built the same way.tarballOfhere has that signature, so whichever PR lands second deletes the local copy.Timings. The old and the new file were run alternately on the same machine.
bun bd): old 22.2s, 21.0s, 21.8s. New 11.9s, 11.9s, 11.6s. Same machine, release canary (USE_SYSTEM_BUN=1, what the CI lanes run): old 19.8s, 19.9s, 20.1s, 20.4s. New 10.4s, 10.6s, 11.2s, 11.5s. All runs passed. The 16-branch test alone went from 20.4s to 10.1s and is now the whole wall time of the file. A cold install of it makesbun installspawn about 60gitprocesses (one bare clone, thenclone --no-checkoutandcheckoutper package, and onegit logper dependency edge), and the test does two of them on purpose.bun bd test: old 4.8s, 5.0s, 5.0s. New 4.0s, 4.0s, 4.1s (the final revision: 4.1s to 4.4s on a busier machine). A test file that only imports the harness takes 2.3s on this build, so the work of the file went from about 2.7s to about 1.7s. CPU time (user+sys, children included): 8.9s to 7.8s.gitandtarshims on PATH. Old: 299. The fixtures spawned 139 of them (10init, 25checkout, 23add, 25commit, 25push, 7update-server-info, 24tar) andbun install160 (54clone, 106git -C). New: 173 in each of 5 runs. The fixtures spawn 13 (3init, 5fast-import, 5update-server-info) andbun installthe same 160. Eachgit pushalso forkedreceive-packandpack-objects, which the shims do not see. The Linux numbers therefore understate the gain, and the Linux timings understate it more, because process creation is cheap there.Assertion changes, per test.
[17]tasks: one clone, 16 checkouts), stdout with the commit each of the 16 branches resolved to, the 16 installed markers as one object, the 16 bun.lock rows including pkg-a's dependencies, exit code. Before: twonot.toContainon stderr, the markers, exit code.github:(2 attempts each): the same, with[32]and[16]tasks (download and extract per package), bun.lock rows with the integrity of the served bytes (and, for GitHub, the resolved tagscope-pkg-x-0000000), stdout with#0000000for GitHub, and each tarball downloaded exactly once per attempt although 11 (GitHub: 7) of them are depended on twice.moveBranchthe test checks thatpkg-mpoints at a new commit andpkg-ndoes not. The cold install checks stdout (the locked commits, not the new tip), empty stderr, markers and unchanged bun.lock. Before:not.toContain("error:"), markers, exit code.git+file://: stderr snapshot ([2]), stdout with the commit, marker, bun.lock row, exit code. Before:not.toContain, marker, exit code.Fixture details.
fast-importwrites loose objects (fastimport.unpackLimit), the same layout the oldpushproduced. A pack would work too, becauseupdate-server-infolists it inobjects/info/packsfor dumb HTTP clients.info/refsinstead of hard-coding them.tar -czfof a directory, so they also started with the directory entry. The bun.lock integrity is the sha512 of the tarball bytes, which the test computes from the bytes it serves.bun installprints the+lines in name order (a package's dependencies are sorted when its package.json is parsed,src/install/lockfile/Package.rs).expectInstalledsorts its expectations the same way.test/expected-durations.jsonis not touched. CI regenerates it.