fix(test): pass --parallel so the full suite finishes instead of reading as hung - #2427
fix(test): pass --parallel so the full suite finishes instead of reading as hung#2427olddonkey wants to merge 3 commits into
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…ing as hung `bun run test` spawned `bun test --isolate ./tests/`. With `--isolate` and no `--parallel`, Bun re-evaluates the module graph once per file on a single core. Past ~900 files that stops looking slow and starts looking hung. Measured on this tree (902 files): without --parallel 1 h 29 m, zero output, ~57 % CPU, 8.5 MB RSS, killed with --parallel ~110-190 s, 10x PARALLEL The failure mode is what makes this worth fixing rather than documenting: there is no progress output, one core is pinned, and RSS stays tiny, so it reads as a deadlock. A contributor's reasonable conclusion is that the suite is broken. The stale "normally runs in about 210s" warning is updated for the same reason — that number predates the file count that made the flag necessary. `resolveBunTestArgs` is exported and pinned by tests so the flag cannot be dropped again silently, including the two easy-to-regress cases: a caller supplying `--parallel=N` must not be overridden, and an option-only argv such as `--timeout=30000` must still count as a full-suite run and keep `./tests/`. Gate: 14436 pass / 2 fail; both also fail on untouched upstream/dev at this commit (baseline: 4 fail, a superset). Zero regressions. Note on scope: this is the smallest change that makes the suite runnable. Two adjacent changes are deliberately left out and will be proposed separately — narrowing the exclusive-run lock to full-suite runs (a behavior change that lets two focused runs share one sandboxed HOME), and a `test:changed` script with the contributing-guide updates that go with it. Separately and not addressed here: `tests/key-login-live-update.test.ts` fails standalone and serially on a clean tree, so every full run is red by at least one test regardless of this change.
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📝 WalkthroughWalkthroughThe test runner centralizes Bun test argument construction. It adds default isolation and parallel execution, preserves caller options, targets ChangesBun test argument resolution
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The test command can silently skip the full test suite when Bun’s separated-value --timings option is used, because its value may be mistaken for a test filter. The PR is otherwise mergeable, but this argument-handling case should be fixed or explicitly accepted by the owner. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@scripts/test.ts`:
- Around line 67-69: Update isFullSuiteRun to recognize and skip values
belonging to supported space-separated options such as --timeout, --retry,
--preload, --reporter, and --test-name-pattern before classifying positional
filters, so ["--timeout", "30000"] remains a full-suite run and
resolveBunTestArgs preserves ./tests/. Add the corresponding regression case to
the test-runner tests.
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리뷰 · 우선순위 34 / 80설명: 이 PR 은 전체 시험이 멈춘 것처럼 보이게 만드는 한 칸을 넣는다. 지금 CURRENT 지금 HEAD 의 scripts/test.ts 144줄은 bun test 에 --isolate 만 붙이고 파일을 한 줄로 돌린다. --parallel 은 없다. 작성자가 이 나무에서 902 개 파일을 재었다. 칸이 없으면 1시간 29분, 출력 없음, 시피유 약 57 퍼센트, 메모리 8.5 메가에서 죽였고 끝나지 않았다. 칸이 있으면 약 110 초에서 190 초다. 느린 것이 아니라 멈춘 것처럼 보인다. 새로 온 사람이 스위트가 고장 났다고 생각하기 쉽다. 155줄 경고는 아직도 보통 210 초라고 적는다. 파일 수가 그 숫자를 밀어 냈다. 이 PR 은 resolveBunTestArgs 를 빼서 시험을 잠근다. 기본은 --isolate 와 --parallel 과 ./tests/ 이다. 호출자가 --parallel=N 을 주면 덮지 않는다. --timeout=30000 처럼 칸만 있는 인자도 전체 스위트로 본다. 파일 이름을 주면 ./tests/ 를 붙이지 않는다. 작성자가 일부러 빼 둔 것이 두 개다. 전체 스위트만 줄을 세우게 좁히는 것, 그리고 바뀐 파일만 도는 스크립트다. 둘 다 정책이라서 이번 범위가 아니다. 작성자 로컬은 14436 통과 2 실패이고, 그 실패는 손대지 않은 upstream/dev 에도 있다고 했다. tests/key-login-live-update.test.ts 는 혼자 돌려도 빨간다고 적었다. 칸이 스위트를 더 흔들었는지는, 칸 없이 전체가 끝나지 않아서 증명하지 못했다. CodeRabbit 은 칸과 값을 띄어 쓴 인자를 아직 잘못 볼 수 있다고 했다. isFullSuiteRun 은 빼기 기호로 시작하지 않는 값을 파일 필터로 본다. --timeout 30000 처럼 띄어 쓰면 30000 이 파일 이름이 되고 ./tests/ 를 안 붙인다. --parallel 4 도 같다. 지금 HEAD 의 144줄도 인자가 하나라도 있으면 ./tests/ 를 안 붙인다. 이 PR 은 등호 칸은 고치고, 띄어 쓴 칸은 그대로 둔다. 작성자는 olddonkey 이다. 드래프트다. bug 라벨만 있다. 체크리스트는 네 칸 중 영 칸이다. 위생은 통과다. Closes 가 없다. 사용자 길이로는 제품 구멍이 아니라 기여자 시험이 멈춘 것처럼 보이는 구멍이라서 34. 카탈로그 팁은 Ox Alpha x-preview-f-free + deepseek-v4-flash-vision-exp. Cursor 정적 카탈로그는 opus-4-8-fast / opus-5-fast. 2334 CursorCredentialRouter 는 여전히 src/providers/cursor-pool.ts 모듈+테스트만 있고 어댑터에 연결되지 않았다. 2332 H2 는 discovery 전용. 2320 overflow + 2342 는 이미 dev. 2188 사이드카는 이미 dev. 2382 데스크톱 앱 재시작은 이미 dev. 2292 는 아직 연다. scripts/test.ts 라인 144 - 지금 HEAD 는 --isolate 만 붙인다. --parallel 이 없어서 전체가 멈춘 것처럼 보인다 메인테이너의 판단이 필요한 지점
너의 추천 이 댓글은 grok-bot이 작성했습니다 |
Two review findings. hasCliFlag/isFullSuiteRun read the whole argv, so `test -- --parallel=2` suppressed the default --parallel even though everything after -- is passed through, and a bare - was classified as an option so `test -` was treated as a full-suite run. The tests also asserted only resolveBunTestArgs output: reverting the spawn call to a hardcoded argv left every assertion green. A spawn test now runs the wrapper against a non-matching filter and asserts bun reports PARALLEL.
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Updated after review — two findings, both real. Argv classification was wrong for two shapes. The tests could not catch the regression they exist for. They asserted only Gate: 14437 pass / 3 fail, all in the load-sensitive |
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Inline comments:
In `@tests/test-runner.test.ts`:
- Around line 107-123: Update the test identified by “the wrapper passes
parallel execution through to bun” to assert that result.exitCode is 0 before
validating the combined output contains “PARALLEL”.
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Two CodeRabbit findings, plus a regression the first attempt introduced. isFullSuiteRun read a space-separated option value as a file filter, so `bun run test --timeout 30000` silently stopped being a full-suite run and dropped ./tests/. Bun 1.4.0 accepts that form. The first fix over-corrected: treating every value-taking option as consuming the next argument swallowed the filter in ["--parallel", "tests/foo.test.ts"], so a focused run became a full-suite run — worse than the original bug, and silent. --parallel, --changed, --timings and --coverage take OPTIONAL values, which Bun expects attached with =. Now only required-value options consume the next argument, and all six boundary shapes are pinned as tests. The spawn test also asserted only that the output contained PARALLEL, so it could pass after a nonzero wrapper exit; it now asserts exitCode 0 first, against a real fixture file so a successful run is meaningful.
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Both CodeRabbit findings addressed — and the first attempt at the argv one introduced a worse regression, so this is worth spelling out. Space-separated option values. The over-correction. Treating every value-taking option as consuming the next argument then swallowed the filter in Only required-value options consume the next argument now. All six boundary shapes are pinned as tests and were verified by running the resolver directly:
The spawn test could pass after a failed run. It asserted only that the output contained Gate: 14438 pass / 2 fail, both inside the repo's load-sensitive flaky pool (built from five base runs on untouched |
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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
In `@scripts/test.ts`:
- Around line 71-138: Add "--timings" to BUN_TEST_OPTIONS_REQUIRING_VALUES
immediately after "--shard" so separated timing values are parsed as option
arguments and isFullSuiteRun still includes ./tests/. Add a regression assertion
in the test-runner test covering the separated-value form.
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| const BUN_TEST_OPTIONS_REQUIRING_VALUES = new Set([ | ||
| // Test options. | ||
| "--timeout", | ||
| "--rerun-each", | ||
| "--retry", | ||
| "--seed", | ||
| "--coverage-reporter", | ||
| "--coverage-dir", | ||
| "-t", | ||
| "--test-name-pattern", | ||
| "--grep", | ||
| "--reporter", | ||
| "--reporter-outfile", | ||
| "--max-concurrency", | ||
| "--path-ignore-patterns", | ||
| "--parallel-delay", | ||
| "--shard", | ||
| // Runtime options accepted by `bun test`. | ||
| "--watch-kill-signal", | ||
| "-r", | ||
| "--preload", | ||
| "--require", | ||
| "--import", | ||
| "--cpu-prof-name", | ||
| "--cpu-prof-dir", | ||
| "--cpu-prof-interval", | ||
| "--heap-prof-name", | ||
| "--heap-prof-dir", | ||
| "--heap-prof-interval", | ||
| "--install", | ||
| "-e", | ||
| "--eval", | ||
| "-p", | ||
| "--print", | ||
| "--port", | ||
| "--origin", | ||
| "--conditions", | ||
| "--fetch-preconnect", | ||
| "--max-http-header-size", | ||
| "--dns-result-order", | ||
| "--redirect-warnings", | ||
| "--disable-warning", | ||
| "--title", | ||
| "--unhandled-rejections", | ||
| "--console-depth", | ||
| "--user-agent", | ||
| "--cron-title", | ||
| "--cron-period", | ||
| "--trace-event-categories", | ||
| "--trace-event-file-pattern", | ||
| "--stack-trace-limit", | ||
| // Transpiler and base options accepted by `bun test`. | ||
| "--main-fields", | ||
| "--extension-order", | ||
| "--tsconfig-override", | ||
| "-d", | ||
| "--define", | ||
| "--drop", | ||
| "--feature", | ||
| "-l", | ||
| "--loader", | ||
| "--jsx-factory", | ||
| "--jsx-fragment", | ||
| "--jsx-import-source", | ||
| "--jsx-runtime", | ||
| "--env-file", | ||
| "--cwd", | ||
| ]); |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
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Bun 1.4.0 bun test --timings option separated value CLI documentation
💡 Result:
In Bun, the --timings CLI option is used to record and utilize the execution duration of test files to optimize test sharding and parallel execution [1][2]. It allows Bun to balance test workloads based on time rather than file count, preventing scenarios where one shard is disproportionately slower than others [1][3]. Key details regarding the --timings option: Usage: You can specify a path to a JSON file to read or write timing data, such as --timings=.bun-test-timings.json [1][2]. Recording Data: Use the --update-timings flag in conjunction with --timings to record or update the execution durations of test files after a run [1][2]. Balancing: When --timings is provided, Bun uses the recorded durations to divide test files into shards so that each shard has a similar total execution time [1][3]. Under --parallel, Bun also uses these timings to schedule the slowest files first, improving overall throughput [1][2]. Multiple Files: You can pass --timings multiple times to read from several files, which is useful in CI environments where different shards generate separate timing reports [1][2]. Data Format: The timing data is stored in a JSON file where keys are file paths (relative to the project root) and values are the wall-clock milliseconds required to execute the test file [1][2]. This functionality is particularly beneficial for large test suites in CI/CD pipelines, as it allows for efficient, time-balanced distribution of tests across multiple runners [1][4].
Citations:
- 1: https://bun.com/docs/test/parallel
- 2: https://bun.com/docs/test/parallel.md
- 3: https://bun.sh/docs/test
- 4: https://bun.com/docs/test
🌐 Web query:
site:github.com/oven-sh/bun "timings" "parse" "TestCommand" Bun
💡 Result:
In the context of the Bun runtime, TestCommand is an internal CLI component used to handle the bun test command [1][2]. The term timings does not refer to a standalone public command or flag, but rather relates to how the test runner generates performance data and handles execution duration during the test lifecycle [3]. There is no public-facing timings parse command. The timing information generated by bun test is part of the internal test reporting and cleanup process [3]. Specifically, when tests complete or bail (e.g., via the --bail flag), the Bun test runner writes summary and timing data as part of its teardown sequence, which may include formats like JUnit [3]. Key technical points regarding TestCommand and timing: - TestCommand serves as the primary entry point for the bun test subcommand, managing test discovery, execution options (such as --timeout and --parallel), and lifecycle management [4][5][2]. - Internal test execution involves managing the event loop to ensure timers and asynchronous tasks are properly accounted for before a test file finishes [6]. - Timing data is often managed internally by the runner and outputted as part of reporter formats (like JUnit) rather than parsed through a separate CLI utility [4][3]. If you are encountering errors or unexpected behavior related to timings, it is likely tied to internal state handling, such as fake timers (jest.useFakeTimers()) or event loop drainage, which are managed within TestCommand::run [6][7].
Citations:
- 1: https://github.com/oven-sh/bun/blob/7e57e529/src/cli/Arguments.zig
- 2: https://github.com/oven-sh/bun/blob/5a0b93523134ca0043ee7ae84f01003aa4b7ff69/src/cli.zig
- 3: bun test: exit through the VM teardown path when --bail stops a run oven-sh/bun#39010
- 4: https://github.com/oven-sh/bun/blob/1498d7b7/src/runtime/cli/Arguments.rs
- 5: https://github.com/oven-sh/bun/blob/7e57e529/src/cli.zig
- 6: bun test: drain the event loop for script files with no test() registrations oven-sh/bun#34862
- 7: bun test: reset fake timers and setSystemTime between test files oven-sh/bun#36398
🌐 Web query:
site:bun.com/docs/test/parallel "--timings" "update-timings"
💡 Result:
The --update-timings flag is a feature of the Bun test runner, used in conjunction with the --timings flag to optimize test parallelization [1]. When running tests, passing --timings=<file_path> and --update-timings instructs Bun to record the duration of each test file execution into a specified JSON file [1]. This data allows Bun to balance test shards more effectively by distributing tests based on their actual duration rather than just the number of files, preventing scenarios where a single shard receives all of the slowest tests [1]. Key behaviors include: - Without the --shard flag, --update-timings merges new timing data into the existing file, refreshing entries for files that were run while retaining previous data for other files [1]. - When using --shard, --update-timings only updates the records for the specific files executed within that shard [1]. - The resulting JSON file lists test files and their execution times in milliseconds, which Bun later uses to distribute workloads across workers more efficiently [1].
Citations:
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Bun 1.4.0 "--timings=" "--timings" bun test
💡 Result:
In Bun 1.4.0, the --timings flag for bun test is used to read and write per-file test execution durations to balance test shards by total time rather than file count [1][2]. Key details regarding the use of --timings: Functionality: By providing a path to a JSON file via --timings, you allow Bun to record how long each test file takes to run [1][2]. When used with --shard, this enables Bun to cut shards based on total expected duration, which is more accurate than dividing by file count [1][2]. When used with --parallel, the coordinator uses these durations to cut worker chunks by time, and each worker is instructed to start its slowest file first [1][2]. Usage: 1. To record durations, you can use: bun test --timings=.bun-test-timings.json --update-timings [1][2] 2. To use the recorded timings, you can include the flag: bun test --shard=2/8 --parallel --timings=.bun-test-timings.json [1][2] Important Notes: - Multiple --timings flags can be passed; Bun will read them as one merged table [1][2]. - When --update-timings is used, the results are written to the first path provided in the --timings argument [1][2]. - Durations are stored as wall-clock milliseconds for the entire file [1][2]. - Files without a pre-existing entry in the timings file are assumed to have a median duration [1][2]. - If --shard is used, --update-timings will only write data for the files that specific shard executed [1][2]. This functionality is designed to optimize CI performance by keeping execution times balanced across shards and workers while maintaining locality for module caching [3][1][2].
Citations:
- 1: https://bun.com/docs/test/parallel
- 2: https://bun.com/docs/test/parallel.md
- 3: https://bun.com/docs/test
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github oven-sh/bun src cli Arguments.zig timings update-timings
💡 Result:
The --update-timings flag is a feature of the Bun test runner, used to automatically record and update the execution durations of test files [1]. This flag is typically used in conjunction with parallel test execution, where Bun shards tests across multiple processes [1]. Each shard writes the duration of the files it executes, and these timings are then used in subsequent runs to optimize test distribution, ensuring a more balanced workload [1]. While Arguments.zig in the Bun source code defines various CLI arguments and parameters [2][3], the --update-timings flag specifically relates to the test runner's configuration and logic [4][1]. As of recent updates, Bun is undergoing a transition from Zig to Rust [5], but historically, the CLI argument parsing and test command logic have been managed within the Zig-based codebase [3][4][6]. To use --update-timings in a CI/CD environment (such as GitHub Actions), you typically provide a path where timing data should be stored or read from, often using the --timings flag to specify paths for timing files [1]. This helps Bun maintain a consistent and efficient testing performance across runs [1].
Citations:
- 1: https://bun.com/docs/test
- 2: https://github.com/oven-sh/bun/blob/7abe6c38/src/cli/Arguments.zig
- 3: https://github.com/oven-sh/bun/tree/main/src/cli
- 4: https://github.com/oven-sh/bun/blob/5a0b93523134ca0043ee7ae84f01003aa4b7ff69/src/cli.zig
- 5: https://bun.com/blog/bun-v1.4
- 6: https://github.com/oven-sh/bun/blob/b131639cc545af23e568feb68e7d5c14c2778b20/src/cli.zig
🏁 Script executed:
#!/bin/bash
set -euo pipefail
repo='https://api.github.com/repos/oven-sh/bun'
ref_json="$(curl -L -sS "$repo/git/ref/tags/bun-v1.4.0")"
printf '%s\n' '--- bun-v1.4.0 tag object ---'
printf '%s\n' "$ref_json" | jq -r '.object.type + " " + .object.sha'
type="$(printf '%s\n' "$ref_json" | jq -r '.object.type')"
sha="$(printf '%s\n' "$ref_json" | jq -r '.object.sha')"
if [ "$type" = tag ]; then
sha="$(curl -L -sS "$repo/git/tags/$sha" | jq -r '.object.sha')"
fi
printf '%s\n' '--- dereferenced commit ---'
printf '%s\n' "$sha"
curl -L -sS "$repo/commits/$sha" | jq -r '.sha'
tmpdir="$(mktemp -d)"
trap 'rm -rf "$tmpdir"' EXIT
for path in src/runtime/cli/Arguments.rs src/runtime/cli/test_command.rs src/runtime/cli/test/Timings.rs; do
out="$tmpdir/$(basename "$path")"
status="$(curl -L -sS -o "$out" -w '%{http_code}' "https://raw.githubusercontent.com/oven-sh/bun/$sha/$path")"
printf '%s %s\n' "$path" "$status"
if [ "$status" = 200 ]; then
rg -n -C 8 'timings|update-timings' "$out" || true
fi
doneRepository: lidge-jun/opencodex
Length of output: 16109
Add --timings to BUN_TEST_OPTIONS_REQUIRING_VALUES.
In scripts/test.ts:71-138, add "--timings" after "--shard". Bun 1.4.0 accepts --timings <STR>.... Without this entry, isFullSuiteRun treats .bun-test-timings/current.json as a test filter and omits ./tests/.
Add a regression assertion in tests/test-runner.test.ts for the separated-value form.
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In `@scripts/test.ts` around lines 71 - 138, Add "--timings" to
BUN_TEST_OPTIONS_REQUIRING_VALUES immediately after "--shard" so separated
timing values are parsed as option arguments and isFullSuiteRun still includes
./tests/. Add a regression assertion in the test-runner test covering the
separated-value form.
Ingwannu
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Ingwannu
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The --parallel direction is useful and the focused test-runner suite passes on the current head, but one Bun 1.4.0 argv boundary is still incomplete.
scripts/test.ts does not include --timings in BUN_TEST_OPTIONS_REQUIRING_VALUES. The repository and CI resolve Bun 1.4.0 from package.json, and Bun 1.4.0 declares --timings <STR>.... Therefore resolveBunTestArgs(["--timings", ".bun-test-timings/current.json"]) currently returns --isolate --parallel --timings .bun-test-timings/current.json without ./tests/: the timing file is misclassified as a positional test filter, so the wrapper can silently run no repository suite.
Please add --timings to the required-value set and add a separated-value regression alongside the existing --timeout case. Re-run tests/test-runner.test.ts on the updated exact head. I do not think the PR needs broader lock-policy or test:changed expansion; this is only completing the argv grammar the new resolver owns.
3 participants
The problem
bun run testspawnsbun test --isolate ./tests/. With--isolateand no--parallel, Bun re-evaluates the module graph once per file on a single core. Past ~900 files that stops looking slow and starts looking hung.Measured on this tree (902 test files):
--parallel--parallel10x PARALLEL)The failure mode is what makes this worth fixing rather than documenting: no progress output, one core pinned, RSS tiny. It reads as a deadlock, and the reasonable conclusion for someone new to the repo is that the test suite is broken. I hit this on a fresh worktree and spent the first hour and a half assuming the suite was simply large.
The stale
"normally runs in about 210s"warning is updated for the same reason — that figure predates the file count that made the flag necessary.Why it is pinned by tests
resolveBunTestArgsis exported and covered so the flag cannot be dropped again silently, including the two cases that are easiest to regress:--parallel=Nmust not be overridden;--timeout=30000must still count as a full-suite run and keep./tests/(otherwise it is misread as a focused run and silently tests nothing).Scope
This is deliberately the smallest change that makes the suite runnable. Two adjacent changes are left out and will be proposed separately, because they are behavior/policy decisions rather than a fix:
--parallelmakes a full run saturate the machine, so letting focused runs start alongside it is a trade-off that deserves its own discussion;test:changedscript plus the contributing-guide updates that go with it, which changes when contributors are expected to run the full suite.Gate
bun test --isolate --parallel ./tests/— 14436 pass / 2 fail. Both failures also occur on untouchedupstream/devat this commit (baseline: 4 fail, a superset). Zero regressions.Reported as a set difference against a baseline rather than an absolute count, because the suite is not currently stable at full-suite scale.
Not addressed here
tests/key-login-live-update.test.tsfails standalone and serially on a clean tree — verified by running that one file alone with no parallelism. Every full run is therefore red by at least one test regardless of this change. Worth its own fix, since a permanently red suite hides real regressions.I could not establish whether the remaining intermittent full-suite failures are caused by
--parallelitself: proving that needs a serial full-suite run for comparison, which is exactly the run that does not finish. What is established is that the four files involved pass standalone and together, serial and parallel (6/6 green, 157 tests) — so they are not individually broken. Note also that the suite was not runnable at all before this change, so--parallelcannot be said to have destabilised a previously stable suite.🤖 Generated with Claude Code
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