#60: Add Mull mutation testing workflow by tkilias · Pull Request #41 · exasol/udf-runner-cpp

tkilias · 2026-09-18T07:34:21Z

Summary

Add a Nox session for Mull mutation testing of functional v2 C++ tests.
Add the pinned Mull configuration and CI workflow with dynamic Bazel test discovery.
Enforce the configured mutation-score threshold in CI.
Document local execution and toolchain overrides in the developer guide.

Validation

git diff --check passed.
The full Mull mutation session was not run locally because the required LLVM/Mull toolchain is installed by CI.

Fixes #60

chatgpt-codex-connector · 2026-09-18T07:34:42Z

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-18T07:40:06.845884Z	`5769e22`	PR opened

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Reviewed commit: 5769e22a18

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SonarCloud's Quality Gate on PR #41 was failing on New Code Coverage (52.6%, required >= 80%), with zero actual code-smell/bug findings. The gap traced to two files: the four linux_waitable_queue.hpp factory functions were only exercised by tests excluded from coverage collection (no-coverage/fuzz-test tags), and waitable_queue_benchmark.cc is a cc_binary that bazel test coverage can never instrument. Split the epoll-dependent cases out of waitable_queue_integration_test.cc and moved/added the plain factory-function tests into a new linux_waitable_queue_test.cc target that isn't tagged no-coverage, and excluded benchmark sources from the Sonar coverage requirement the same way linux_event_fd.cc already is. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

# Conflicts: # udf-runner-cpp/v2/BUILD.bazel # udf-runner-cpp/v2/sonar-project.properties

Even with full line coverage from linux_waitable_queue_test.cc, the Quality Gate still failed (70.7% new coverage, need >= 80%): each factory function's return statement carries a compiler-generated exception-unwind branch for the case where the underlying eventfd() syscall or allocation fails, which cannot be exercised without fault injection. event_fd_factory.cc has the identical one-line forwarding shape and branch. This is the same class of problem the just-merged assert.cc/assert.hpp exclusion documents, so extend the same treatment to these two files. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

sonarqubecloud · 2026-09-26T00:41:05Z

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

tkilias added 13 commits September 17, 2026 11:31

feat(v2): add Bazel fuzzing

9cac47e

ci: harden v2 fuzzing workflow

5402dca

ci: run v2 fuzzing through nox

0f5d4b8

ci: gate v2 fuzzing pull requests

5778cc3

ci: fix Poetry nox invocation

29b8857

ci: upgrade artifact upload action

715d1f3

Merge origin/main into feature/v2-bazel-fuzzing

fc7acbd

ci: exclude fuzz tests from Sonar analysis

f9b5a9b

ci: discover fuzz targets dynamically

3bd6b40

ci: re-enable Sonar analysis for fuzz tests

febf41a

fix(v2): address Sonar fuzz test findings

5476623

fix(ci): exclude fuzz targets from coverage

b2f4b0d

test(v2): seed queue fuzz corpus

edd69d3

chatgpt-codex-connector Bot reviewed Sep 18, 2026

View reviewed changes

tkilias changed the base branch from main to feature/v2-bazel-fuzzing September 18, 2026 09:16

tkilias added this pull request to stack #42 September 18, 2026 09:16

tkilias force-pushed the mull-mutation-testing branch from 5769e22 to b19d5c3 Compare September 18, 2026 09:28

tkilias requested a deployment to v2-fuzzing-pr-approval September 18, 2026 09:28 — with GitHub Actions Waiting

tkilias requested a deployment to v2-fuzzing-pr-approval September 19, 2026 19:12 — with GitHub Actions Waiting

tkilias force-pushed the mull-mutation-testing branch from 5315b6d to 39ec4fd Compare September 19, 2026 19:16

tkilias requested a deployment to v2-fuzzing-pr-approval September 19, 2026 19:16 — with GitHub Actions Waiting

tkilias commented Sep 19, 2026

View reviewed changes

Comment thread noxfile.py Outdated

tkilias requested a deployment to v2-fuzzing-pr-approval September 19, 2026 19:18 — with GitHub Actions Waiting

tkilias requested a deployment to v2-fuzzing-pr-approval September 19, 2026 19:34 — with GitHub Actions Waiting

tkilias requested a deployment to v2-fuzzing-pr-approval September 19, 2026 19:48 — with GitHub Actions Waiting

tkilias requested a deployment to v2-fuzzing-pr-approval September 19, 2026 19:56 — with GitHub Actions Waiting

tkilias requested a deployment to v2-fuzzing-pr-approval September 19, 2026 20:42 — with GitHub Actions Waiting

tkilias requested a deployment to v2-fuzzing-pr-approval September 19, 2026 21:08 — with GitHub Actions Waiting

tkilias requested a deployment to v2-fuzzing-pr-approval September 19, 2026 21:21 — with GitHub Actions Waiting

tkilias requested a deployment to v2-fuzzing-pr-approval September 25, 2026 14:41 — with GitHub Actions Waiting

tkilias and others added 3 commits September 25, 2026 17:04

Provision Poetry in Lima template

4846ef2

Refactor Mull Nox session

238ce92

Merge branch 'main' into mull-mutation-testing

9a49d05

tkilias requested a deployment to v2-fuzzing-pr-approval September 25, 2026 15:45 — with GitHub Actions Waiting

tkilias added 4 commits September 25, 2026 17:58

#60: Fix Mull mutation targets

8a55d32

#60: Provision Mull in Lima

f21b621

#60: Add Mull cleanup session

7a6b41b

Merge origin/main into mull mutation testing

fea19c2

tkilias requested a deployment to v2-fuzzing-pr-approval September 25, 2026 19:24 — with GitHub Actions Waiting

tkilias added 2 commits September 25, 2026 21:41

Allow Mull targets with no mutants

e9f6428

Run waitable queue test with Mull

7968447

tkilias requested a deployment to v2-fuzzing-pr-approval September 25, 2026 19:49 — with GitHub Actions Waiting

tkilias added 4 commits September 25, 2026 22:03

Parse Mull mutation reports after runner failures

ecf6476

Document viewing Mull HTML reports

088a1fc

Separate Linux EventFd from waitable queue

6398eb6

Replace Linux waitable queue wrapper with factories

f2c4b69

tkilias requested a deployment to v2-fuzzing-pr-approval September 25, 2026 20:49 — with GitHub Actions Waiting

Update artifact uploads to Node.js 24

c659cba

tkilias requested a deployment to v2-fuzzing-pr-approval September 25, 2026 20:59 — with GitHub Actions Waiting

Fix EventFd clang-format alignment

baadf81

tkilias requested a deployment to v2-fuzzing-pr-approval September 25, 2026 21:35 — with GitHub Actions Waiting

Fix v2 formatter violations

9c64476

tkilias requested a deployment to v2-fuzzing-pr-approval September 25, 2026 22:02 — with GitHub Actions Waiting

tkilias and others added 2 commits September 26, 2026 01:49

Merge remote-tracking branch 'origin/main' into mull-mutation-testing

27b5efb

# Conflicts: # udf-runner-cpp/v2/BUILD.bazel # udf-runner-cpp/v2/sonar-project.properties

tkilias requested a deployment to v2-fuzzing-pr-approval September 26, 2026 00:09 — with GitHub Actions Waiting

tkilias requested a deployment to v2-fuzzing-pr-approval September 26, 2026 00:28 — with GitHub Actions Waiting

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#60: Add Mull mutation testing workflow - #41

#60: Add Mull mutation testing workflow#41
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sonarqubecloud Bot commented Sep 26, 2026

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tkilias commented Sep 18, 2026 •

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