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test(ci): fix the ephemeral-port flakes and make a failing test group cancel the rest - #815
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Three integration harnesses picked a port by binding a probe on port 0 and closing it, then let something else bind that port seconds later. The window is the whole of Process.Start plus the child's startup, and this test process opens sockets constantly, so the kernel can hand the same port out twice. CI run 34509778735, the 0.1.0 release, died exactly there: the child Kestrel reported "Failed to bind to address http://127.0.0.1:32869: address already in use" and the parent reported "child exited before readiness". A spawn attempt now ends in one of three states, and the retry reads which: ready, dead because its port was taken, or dead for any other reason. Only the middle one retries, on a fresh port, bounded at ten attempts like the FakeOtlpCollector listener it mirrors. Any other death still fails on the first attempt and still carries the child's stdout and stderr, which several cases depend on. ServingSubprocess now holds that logic once instead of three private copies, and the two MultiInstance classes gain a diagnostic they never had - they drained child output to nothing, so a dead child surfaced only as a 60 second timeout with no cause. FakeOtlpCollector.Dispose had a second, unrelated instance of the same race. It called Stop before Dispose; on the managed listener Stop already unregisters the prefix and Dispose removes it a second time, which re-binds the port in between. CI run 33985683213 caught that re-bind losing the port and throwing "Address already in use" out of Dispose, reddening whichever test happened to be disposing. Dispose alone does the full teardown and leaves no window. Verified against the real artefacts. The new guard holds a live listener on the first port handed to the child and asserts the child still comes up; with the attempt cap temporarily set to 1 it fails with the predicted bind error. The Stop-then-Dispose re-bind was reproduced outside this repo in a standalone program, which also confirmed dispose-only teardown neither throws nor leaves the serve loop hanging. Full suite green: 2593 tests, 0 failures. Refs #775
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Organization UI Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (9)
Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe changes centralize integration-test subprocess management and split CI test execution into four fail-fast matrix legs. The ChangesIntegration testing and CI matrix
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~40 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant IntegrationTest
participant ServingSubprocess
participant CluckworkApi
IntegrationTest->>ServingSubprocess: StartReadyAsync with ProcessStartInfo
ServingSubprocess->>CluckworkApi: Launch with ASPNETCORE_URLS
ServingSubprocess->>CluckworkApi: Poll /health/ready
CluckworkApi-->>ServingSubprocess: Ready response or address conflict
ServingSubprocess-->>IntegrationTest: Return BaseUrl after readiness
IntegrationTest->>ServingSubprocess: DisposeAsync
ServingSubprocess->>CluckworkApi: Stop process tree
Merge Risk: ⚪ Minimal · up to The integration-test infrastructure and CI matrix changes retain cleanup and test-publication safeguards, with no unresolved merge-blocking risk identified. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 21.95% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 41 functions across 6 files. (7 skipped: 7 unsupported.)
✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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In `@tests/Cluckwork.Api.IntegrationTests/Infrastructure/ServingSubprocess.cs`:
- Line 51: Update StartReadyAsync around WaitUntilReadyAsync to dispose the
child on every unsuccessful startup, including TimeoutException, before
propagating or handling the failure. Preserve the existing retry behavior for
port conflicts and return the child only after readiness succeeds.
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ℹ️ Review info
⚙️ Run configuration
Configuration used: Organization UI
Review profile: CHILL
Plan: Advanced
Run ID: 43a7f97b-54db-487d-92b4-3c0b0d3c075a
📒 Files selected for processing (5)
tests/Cluckwork.Api.IntegrationTests/Infrastructure/FakeOtlpCollector.cstests/Cluckwork.Api.IntegrationTests/Infrastructure/ServingSubprocess.cstests/Cluckwork.Api.IntegrationTests/MultiInstanceIdempotencyTests.cstests/Cluckwork.Api.IntegrationTests/MultiInstanceRateLimitTests.cstests/Cluckwork.Api.IntegrationTests/OtlpSubprocessExporterTests.cs
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CodeRabbit caught a regression this PR's own refactor introduced. Before it, each call site did `await using var child = StartServing(...)` and awaited readiness separately, so a readiness failure still disposed the child. Moving the spawn inside StartReadyAsync means the caller's `await using` binds only a child the method RETURNS, and the retry disposed only on a lost port. A readiness TIMEOUT is the case that bites, because there the child is still alive. Leaving it holds its port and a database connection for the rest of the run, which is a flake source in the file that exists to remove one. Every unsuccessful attempt now disposes its own child before the exception leaves, and a non-port failure still rethrows unchanged on the first attempt with the child's stdout and stderr intact. The guard was proven red first. A_child_that_never_becomes_ready_is_not_left_running points a child at an unreachable database, so it binds its port and then never passes health ready; the readiness wait gives up and the test re-binds that port. With the disposal moved back behind the rethrow it fails on exactly the leak, "System.Net.Sockets.SocketException : Address already in use", because the abandoned child still held the port. Full suite green: 2594 tests, 0 failures. Refs #775
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@coderabbitai review Round 1's finding was real and is fixed in |
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@coderabbitai review Retrying: the previous request was rate limited and the round never ran. The commit to review is |
🧩 Analysis chain🏁 Script executed: #!/bin/bash
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git diff 8b6f106^ 8b6f106 -- tests/Cluckwork.Api.IntegrationTests/Infrastructure/ServingSubprocess.cs
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sed -n '1,260p' tests/Cluckwork.Api.IntegrationTests/Infrastructure/ServingSubprocess.cs
printf '\n--- tests that exercise StartReadyAsync ---\n'
rg -n -C 5 --glob '*.cs' 'StartReadyAsync\s*\(' tests/Cluckwork.Api.IntegrationTestsLength of output: 32220
I found no new issues in this commit. I also applied the existing lifecycle guidance for 🧠 Learnings used
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@coderabbitai review Third attempt: the previous two were rate limited and neither round ran. The commit to review is |
🧩 Analysis chain🏁 Script executed: #!/bin/bash
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git show --format=fuller --stat 8b6f106
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printf '\n--- ServingSubprocess outline ---\n'
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printf '\n--- ServingSubprocess source ---\n'
sed -n '1,280p' tests/Cluckwork.Api.IntegrationTests/Infrastructure/ServingSubprocess.cs
printf '\n--- readiness factory call sites ---\n'
rg -n -C 4 --glob '*.cs' 'StartReadyAsync\s*\(' tests/Cluckwork.Api.IntegrationTests
printf '\n--- changed test source sections ---\n'
git diff --unified=80 8b6f106^ 8b6f106 -- tests/Cluckwork.Api.IntegrationTests/OtlpSubprocessExporterTests.csLength of output: 41249
The new timeout test verifies that a child which remains alive but never becomes ready releases its bound port. I found no new issues in this commit. I also applied the existing 🧠 Learnings used✅ Action performedReview finished.
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One `dotnet test Cluckwork.sln` ran all four test projects inside one job. The 791 Domain, Application and AppHost tests are about seven seconds of work and reported only after the 1,793 Testcontainers tests finished, so a broken domain invariant cost the job's full wall clock to surface. Measured on run 34743304133: Build and test 9m40s, web 3m38s, image 1m57s, dependency review 11s, all starting within 13 seconds of each other. The jobs were already parallel; the run's wall clock was that one job by itself. Splitting into separate jobs gives the earlier signal and none of the saving, because GitHub does not cancel a sibling job: a domain failure at second five would still leave the integration job burning its remaining eight minutes. The four projects are therefore legs of one matrix with fail-fast on, which is the only built-in mechanism that cancels the rest. It is the default and is written out anyway, because setting it to false gives the saving back in one word while every check stays green. Each leg restores the solution, since locked-mode needs the whole graph, then builds only its own project, so the fast legs never pay for Api or Infrastructure. Cold: Domain 5s, Application 10s, AppHost 5.5s. build-and-test keeps its id, runs no tests and is renamed. What is left is the once-per-run work, the blocking NuGet advisory gate and the schema-docs check, plus the solution build both reuse, which is also what enforces warnings-as-errors across projects a test leg's graph never reaches. publish gains tests in its needs per the release rule that the needs list is exactly what the digest artifact proves; a leg cancelled by fail-fast is not a success, so a cancelled run cannot publish. A matrix can leave a project unrun silently, where the single solution step could not. SolutionTestProjectSplitTests walks the solution and fails any test project ci.yml does not name outside a comment, fails the reverse case of a leg pointing at a path that is not there, and fails on fail-fast false. All three were proven red first: dropping the integration leg reddens the first by name, fail-fast false reddens the third, and renaming a leg's project reddens the first two together. The guard caught two faults in itself while being written. It read "dotnet test Cluckwork.sln" out of the prose comment above the job and counted every project as covered, a vacuous pass, so comment lines are now stripped before matching. And its path pattern required a literal ".Tests", which silently excluded Cluckwork.Api.IntegrationTests. This shortens a red run only. A green run is still bounded by the integration leg, and the container-reuse and parallelism levers stay open. Full suite green: 2597 tests, 0 failures. Refs #775
An adversarial review of this branch found both new guards defective, and both defects were confirmed by running the mutation rather than argued. The port-collision guard asserted an exact attempt count. It held one port and then required that the child came up on precisely the second port handed out. The harness allows ten attempts, and every later port still comes from a probe that closes before the child binds, so "first port held, second port incidentally taken, third port bound" is correct behaviour that failed the test. A guard against a flake that is itself flaky, in the race it exists to survive. It now asserts the invariant instead: more than one attempt, and the child on the last port handed out, which still fails when the retry is removed. The CI guard was worse and is deleted. It scraped ci.yml for project paths and treated "mentioned in the file" as "scheduled by GitHub". Three edits left it green while a leg stopped running: an if: on the Test step, deleting a leg while an inline comment still named it, and continue-on-error on the job. Omitting fail-fast turned it red although GitHub defaults that to true. So it passed when broken and failed when fine, which is exactly what AGENTS.md means by a guard that reads as safety. That boundary is not one a regex over YAML can hold. Doing it properly needs a parser this solution does not have, so rather than patch it a third time it is replaced by a tripwire that makes no claim it cannot keep: the solution's test project inventory must equal the set last reconciled with the matrix. Adding or removing a project fails it and forces the author to the workflow. What is now unguarded is written down in the decision record instead of implied: an if:, a continue-on-error, and fail-fast false are caught only by review. Also corrected the stale descriptions of publish's needs that the matrix left behind, in ci.yml's own header comment and twice in release-please.yml, and the 417 schema-docs note claiming the postgres image is warm from Testcontainers, which stopped being true when that job stopped running the tests. Guards proven red: adding a fifth test project to the solution fails the tripwire on a collection mismatch; the attempt cap set to 1 still fails the port guard. Full suite green: 2595 tests, 0 failures. Refs #775
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@coderabbitai review Note the previous approval at 08:15 covered only up to
Please review those two commits specifically. |
1 similar comment
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@coderabbitai review Note the previous approval at 08:15 covered only up to
Please review those two commits specifically. |
🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '--- requested commits ---'
git show --format=fuller --stat --summary d0d5dfc 15a26ed
printf '%s\n' '--- combined diff from prior reviewed commit ---'
git diff --find-renames --stat 8b6f106..15a26ed
git diff --find-renames --unified=80 8b6f106..15a26ed
printf '%s\n' '--- changed paths ---'
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printf '%s\n' '--- workflow candidates ---'
fd -H -t f -i '.*\.(yml|yaml)$' .github 2>/dev/null || true
printf '%s\n' '--- C# test candidates ---'
fd -t f -e cs tests/Cluckwork.Api.IntegrationTests | sort
printf '%s\n' '--- relevant symbols and assertions ---'
rg -n -C 5 --glob '*.cs' 'StartReadyAsync\s*\(|FreeTcpPort\s*\(|fail-fast|continue-on-error|Test.*step|matrix' tests .github 2>/dev/null || trueLength of output: 163953 🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '--- outlines ---'
ast-grep outline tests/Cluckwork.Api.IntegrationTests/OtlpSubprocessExporterTests.cs --items all
ast-grep outline tests/Cluckwork.Api.IntegrationTests/SolutionTestProjectSplitTests.cs --items all
printf '%s\n' '--- CI matrix and publish sections ---'
rg -n -C 8 '^\s*tests:|^\s*strategy:|fail-fast:|matrix:|^\s*-\s*name: Test$|^\s*publish:|needs: \[tests,' .github/workflows/ci.yml
printf '%s\n' '--- actual CI job block ---'
sed -n '150,285p' .github/workflows/ci.yml
sed -n '645,695p' .github/workflows/ci.yml
printf '%s\n' '--- guard implementations ---'
sed -n '185,250p' tests/Cluckwork.Api.IntegrationTests/OtlpSubprocessExporterTests.cs
sed -n '1,160p' tests/Cluckwork.Api.IntegrationTests/SolutionTestProjectSplitTests.cs
printf '%s\n' '--- solution test-project entries ---'
rg -n '^\s*Project\(.*tests/.*\.csproj' Cluckwork.sln
printf '%s\n' '--- test project files ---'
fd -t f -e csproj . tests | sortLength of output: 24648 @mforce I reviewed The The occupied-port guard no longer requires exactly two attempts. It requires a retry and verifies that the ready child uses the final supplied port. This preserves the intended invariant without asserting behavior that the port race cannot guarantee.
I found no new issues in these two commits. I did not run the test suite in this review environment. ✅ Action performedReview finished.
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@coderabbitai review Note the previous approval at 08:15 covered only up to
Please review those two commits specifically. |
🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
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git show --format=fuller --stat --summary d0d5dfc 15a26ed
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git diff --find-renames --unified=100 15a26ed^ 15a26ed
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rg -n -C 12 '^\s*tests:|^\s*build-and-test:|^\s*publish:|fail-fast:|continue-on-error:|^\s*if:|^\s*-\s*name:\s*Test\b|needs:' .github/workflows/ci.yml
sed -n '135,300p' .github/workflows/ci.yml
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ast-grep outline tests/Cluckwork.Api.IntegrationTests/SolutionTestProjectSplitTests.cs --items all
printf '%s\n' '--- relevant test implementations ---'
sed -n '150,270p' tests/Cluckwork.Api.IntegrationTests/OtlpSubprocessExporterTests.cs
sed -n '1,180p' tests/Cluckwork.Api.IntegrationTests/SolutionTestProjectSplitTests.cs
printf '%s\n' '--- solution and test-project inventory ---'
rg -n '^\s*Project\(.*tests/.*\.csproj' Cluckwork.sln
fd -t f -e csproj . tests | sort
printf '%s\n' '--- matrix references and test project invocations ---'
rg -n -C 4 --glob '*.{yml,yaml,cs,md}' 'Cluckwork\.(Domain|Application|AppHost)\.Tests|Cluckwork\.Api\.IntegrationTests|dotnet test|fail-fast' .github tests AGENTS.md docs/decisionsLength of output: 201813 🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '--- commit metadata and changed paths ---'
git show --format='%H%n%P%n%s' --name-status d0d5dfc
git show --format='%H%n%P%n%s' --name-status 15a26ed
printf '%s\n' '--- current CI tests job and publication dependency ---'
awk '
/^ tests:$/,/^ build-and-test:$/ { print NR ":" $0 }
/^ publish:$/,/^ [A-Za-z0-9_-]+:$/ { print NR ":" $0 }
' .github/workflows/ci.yml
printf '%s\n' '--- CI changes only ---'
git diff --unified=30 d0d5dfc^ d0d5dfc -- .github/workflows/ci.yml
git diff --unified=30 15a26ed^ 15a26ed -- .github/workflows/ci.yml
printf '%s\n' '--- occupied-port guard changes and current implementation ---'
git diff --unified=60 15a26ed^ 15a26ed -- tests/Cluckwork.Api.IntegrationTests/OtlpSubprocessExporterTests.cs
rg -n -A80 -B15 'occupied|collision|portSource|StartReadyAsync' tests/Cluckwork.Api.IntegrationTests/OtlpSubprocessExporterTests.cs
printf '%s\n' '--- solution inventory tripwire and its introducing diff ---'
git diff --unified=100 15a26ed^ 15a26ed -- tests/Cluckwork.Api.IntegrationTests/SolutionTestProjectSplitTests.cs
cat -n tests/Cluckwork.Api.IntegrationTests/SolutionTestProjectSplitTests.cs
printf '%s\n' '--- exact solution test projects ---'
rg -n '^\s*Project\(.*tests/.*\.csproj' Cluckwork.slnLength of output: 62093 @mforce I reviewed commits The The The occupied-port guard now requires at least one retry. It verifies that the ready child uses the final port supplied by
I found no new issues in these commits. I did not execute repository code or tests in this review environment. 🧠 Learnings used
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Review loop stopped deliberately at two consecutive clean rounds. Recording it so the silence is not read as an unfinished response. The count, by confirmed defects in the shipped code rather than by rounds or commits:
Two consecutive rounds that confirmed no defect in the product is the stop point, so I am not triggering another. I am deliberately not using CI is green: 15 checks pass, Four flakes from the #775 census remain characterised but unfixed, and the reasons are in that comment. |
mforce
changed the title
What
Three integration-test harnesses picked an ephemeral port by binding a probe on port 0 and closing it, then let something else bind that port seconds later. Two CI flakes come out of that one shape, and this closes both.
Refs #775 (decision 3), and deliberately leaves that issue open: decision 2's wall-clock levers are untouched, and four of the six flakes CI actually hit are characterised but not fixed. The census comment on #775 records what is left.
The race
GetFreeTcpPort()binds, reads the assigned port, and disposes the probe. The port is then unheld for the whole ofProcess.Startplus the child's .NET startup — one to three seconds — before the child's Kestrel binds it. This test process opens sockets constantly (Testcontainers, Npgsql, other probes,FakeOtlpCollector), so the kernel can hand the same port out twice.CI run 34509778735 — the 0.1.0 release run — died exactly there:
FakeOtlpCollector.Dispose()had a second, independent instance of the same race. It calledStop()beforeDispose(); on .NET's managed (Linux)HttpListener,Stop()already unregisters the prefix, andDispose()removes it a second time — andHttpEndPointManager.GetEPListenerre-creates and re-binds the endpoint listener when the map entry is absent. Anything that grabbed the port in between turns that re-bind into an exception thrown out ofDispose(), reddening whichever test happened to be disposing. CI run 33985683213:The fix
A spawn attempt now ends in one of three states, and the retry reads which: ready, dead because its port was taken, or dead for any other reason. Only the middle one retries, on a fresh port, bounded at ten attempts — the same shape and cap as
FakeOtlpCollector's own listener retry, so the two read as one idea. Any other death still fails on the first attempt and still carries the child's stdout and stderr, which several cases depend on.ServingSubprocessmoves toInfrastructure/and holds that logic once instead of three private copies.FakeOtlpCollector.Dispose()drops theStop()call;Dispose()alone does the full teardown and leaves no window at all, so no defensive catch is needed or added.Net +57 / −237 across the four tracked files. The two
MultiInstanceclasses also gain a diagnostic they never had: they drained child output to nothing, so a dead child surfaced only as a 60-second timeout with no cause.Verification
The new guard is proven red before it is claimed green.
Child_comes_up_when_its_first_port_is_already_takenholds a liveTcpListeneron the first port handed to the child and asserts the child still comes up on a different one. With the attempt cap temporarily set to 1 it fails with exactly the predicted content — the exhaustion throw, innerWaitUntilReadyAsync, child stderr readingFailed to bind to address http://127.0.0.1:42269: address already in use. Cap restored and re-verified.The
Stop()/Dispose()re-bind was reproduced outside this repo in a standalone .NET 10 program, in three steps. With anotherHttpListenertaking the port,Dispose()does not throw — that form of the hypothesis is refuted, and it is why the bug needs a non-HttpListenersocket to appear. With a rawTcpListenertaking the port it throws the exact CI exception. With noStop()at all it neither throws nor leaves the serve loop hanging, and the port is free afterwards.Full suite green:
dotnet test Cluckwork.sln --configuration Release— 2593 passed, 0 failed (Domain 491, Application 290, AppHost 10, Integration 1802).Reviewer notes
ChildExitedBeforeReadyExceptionis a newinternalnested type rather than a string match on the oldInvalidOperationException.Message, so the retry predicate reads the child's output explicitly instead of an exception message that happens to embed it.FakeOtlpCollectordisposal race. There is no deterministic seam for it, and a probabilistic stress guard that passes most of the time is worse than none —AGENTS.mdis explicit on that.test:prefix and no version bump.Summary by CodeRabbit
Bug Fixes
Tests