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fix(jest): support test.concurrent#9209

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juan-fernandez merged 19 commits into
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juan-fernandez/jest-concurrent-test-optimization
Jul 7, 2026
Merged

fix(jest): support test.concurrent#9209
juan-fernandez merged 19 commits into
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juan-fernandez/jest-concurrent-test-optimization

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@juan-fernandez

@juan-fernandez juan-fernandez commented Jul 3, 2026

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What does this PR do?

Supports Jest test.concurrent in Test Optimization by tracking concurrent test registrations and binding each concurrent test body to its own test span context.

The instrumentation handles test.concurrent, test.concurrent.each, test.concurrent.only.failing, duplicate concurrent test names, imported @jest/globals, and retry attempts. Table-driven concurrent tests preserve test.parameters for each expanded row title, including placeholder-based names. Concurrent tests also participate in Test Management disabled-test handling and impacted-test detection/retry metadata.

Motivation

Jest can run concurrent tests from the same file at the same time, so Test Optimization needs per-test context binding for that execution mode.

This brings Jest concurrent execution in line with the Test Optimization span/context model and with the existing Vitest concurrent-test behavior.

Additional Notes

Failed Test Replay remains disabled for any Jest test file that contains test.concurrent. Auto Test Retry can still retry the tests, but debugger probe capture is skipped for that file because FTR needs a sequential active-test-span association.

The concurrent-only integration coverage is gated to the latest Jest matrix so older fixture runs do not collect files that lack the required test.concurrent APIs.

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Overall package size

Self size: 6.57 MB
Deduped: 7.23 MB
No deduping: 7.23 MB

Dependency sizes | name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 3.3.0 | 117.14 kB | 432.47 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | dc-polyfill | 0.1.11 | 25.74 kB | 25.74 kB |

🤖 This report was automatically generated by heaviest-objects-in-the-universe

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Tests

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
Patch Coverage: 73.33%
Overall Coverage: 87.71% (-0.15%)

This comment will be updated automatically if new data arrives.
🔗 Commit SHA: b16cf2c | Docs | Datadog PR Page | Give us feedback!

@juan-fernandez juan-fernandez changed the title fix(jest): disable failed test replay for concurrent files fix(jest): support test.concurrent Jul 3, 2026
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Codecov Report

❌ Patch coverage is 81.85185% with 49 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.55%. Comparing base (eec5c70) to head (b16cf2c).
⚠️ Report is 6 commits behind head on master.

Files with missing lines Patch % Lines
packages/datadog-instrumentations/src/jest.js 81.85% 49 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##           master    #9209      +/-   ##
==========================================
- Coverage   93.65%   93.55%   -0.10%     
==========================================
  Files         899      900       +1     
  Lines       52483    52941     +458     
  Branches    12353    12491     +138     
==========================================
+ Hits        49154    49531     +377     
- Misses       3329     3410      +81     
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Benchmarks

Benchmark execution time: 2026-07-06 21:53:22

Comparing candidate commit b16cf2c in PR branch juan-fernandez/jest-concurrent-test-optimization with baseline commit eec5c70 in branch master.

📊 Benchmarking dashboard

Found 0 performance improvements and 0 performance regressions! Performance is the same for 2255 metrics, 31 unstable metrics.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

  • 🟩 = significantly better candidate vs. baseline
  • 🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

Unstable benchmarks

These benchmarks have a confidence interval too wide to call a change; treat them as noise rather than signal.

scenario:appsec-appsec-enabled-24

  • unstable execution_time [-182.369ms; +186.001ms] or [-6.929%; +7.067%]

scenario:appsec-appsec-enabled-26

  • unstable execution_time [-207.853ms; +210.225ms] or [-8.243%; +8.337%]

scenario:appsec-appsec-enabled-with-attacks-26

  • unstable execution_time [-156321.257µs; +158076.157µs] or [-5.418%; +5.479%]

scenario:appsec-control-20

  • unstable execution_time [-118.017ms; +109.901ms] or [-7.276%; +6.776%]

scenario:appsec-control-24

  • unstable execution_time [-105.042ms; +98.862ms] or [-8.650%; +8.141%]

scenario:appsec-control-26

  • unstable execution_time [-114367.386µs; +112622.219µs] or [-9.464%; +9.319%]

scenario:debugger-line-probe-with-snapshot-default-24

  • unstable cpu_user_time [-1666.249ms; +2382.753ms] or [-19.373%; +27.704%]
  • unstable execution_time [-1671.845ms; +2383.673ms] or [-17.998%; +25.661%]
  • unstable instructions [-14.4G instructions; +20.4G instructions] or [-20.444%; +28.995%]
  • unstable max_rss_usage [-7.414MB; +11.586MB] or [-4.730%; +7.392%]
  • unstable throughput [-654.148op/s; +486.655op/s] or [-18.637%; +13.865%]

scenario:debugger-line-probe-with-snapshot-default-26

  • unstable cpu_user_time [-2905.864ms; +4192.356ms] or [-27.621%; +39.849%]
  • unstable execution_time [-2984.391ms; +4285.138ms] or [-26.600%; +38.193%]
  • unstable instructions [-25.8G instructions; +37.3G instructions] or [-29.195%; +42.244%]
  • unstable max_rss_usage [-9.186MB; +12.752MB] or [-5.630%; +7.816%]
  • unstable throughput [-948.862op/s; +652.830op/s] or [-31.280%; +21.521%]

scenario:debugger-line-probe-with-snapshot-minimal-24

  • unstable cpu_user_time [-2157.408ms; +2128.981ms] or [-23.606%; +23.295%]
  • unstable execution_time [-2148788.907µs; +2149458.107µs] or [-21.896%; +21.903%]
  • unstable instructions [-18427.5M instructions; +18274.4M instructions] or [-24.657%; +24.452%]
  • unstable max_rss_usage [-10878.223KB; +9576.623KB] or [-6.864%; +6.043%]
  • unstable throughput [-592.487op/s; +585.964op/s] or [-17.612%; +17.418%]

scenario:debugger-line-probe-without-snapshot-26

  • unstable cpu_user_time [-3222.893ms; +2932.379ms] or [-31.992%; +29.108%]
  • unstable execution_time [-3309.307ms; +3080.815ms] or [-30.734%; +28.612%]
  • unstable instructions [-28.1G instructions; +25.8G instructions] or [-33.324%; +30.683%]
  • unstable max_rss_usage [-9158.089KB; +10228.489KB] or [-5.692%; +6.357%]
  • unstable throughput [-674.986op/s; +696.432op/s] or [-21.478%; +22.160%]

scenario:dogstatsd-with-tags-20

  • unstable cpu_user_time [-351.465ms; +355.078ms] or [-7.075%; +7.148%]
  • unstable execution_time [-355.580ms; +353.492ms] or [-7.049%; +7.008%]
  • unstable throughput [-120592.017op/s; +121726.773op/s] or [-7.244%; +7.312%]

scenario:plugin-graphql-long-with-depth-and-collapse-off-20

  • unstable max_rss_usage [-39.335MB; +52.502MB] or [-10.118%; +13.505%]

scenario:test-optimization-large-suite-20

  • unstable max_rss_usage [-4.047MB; +9.015MB] or [-4.932%; +10.987%]

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Datadog Autotest: FAIL

Two isModified false-negative bugs in the concurrent test support code. wrapConcurrentTestFunction registers tests with a shimmer wrapper whose toString() spans only 3–4 lines; both the add_test retry-scheduling path and the test_start retry overwrite path use this narrow wrapper instead of the original user fn to compute the modified-line range. Any modification beyond the test declaration line is silently missed, so impacted test.concurrent tests with multi-line bodies are never retried — confirmed by synthetic execution showing endLine = startLine+3 vs. endLine = startLine+7 for an 8-line test body with the modification at startLine+4.

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Datadog Autotest: PASS

More details

The ATR/FTR flag separation and concurrent context-propagation machinery are correctly implemented. The FIFO context queue handles duplicate test names safely, retries recover the correct span context via originalTestFns restore + WeakMap lookup, and the hasConcurrentTests flag is set during the describe phase — well before any test_done events — so FTR gating is always computed on complete information. One minor sentinel issue exists in getJestEachBind (using undefined for both "not-loaded" and "not-found" states causes redundant require attempts when jest-each is absent), but jest-each is a hard Jest dependency so this is never triggered in practice.

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@juan-fernandez
juan-fernandez merged commit 37a5069 into master Jul 7, 2026
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juan-fernandez deleted the juan-fernandez/jest-concurrent-test-optimization branch July 7, 2026 07:46
dd-octo-sts Bot pushed a commit that referenced this pull request Jul 7, 2026
@dd-octo-sts dd-octo-sts Bot mentioned this pull request Jul 7, 2026
dd-octo-sts Bot pushed a commit that referenced this pull request Jul 7, 2026
@dd-octo-sts dd-octo-sts Bot mentioned this pull request Jul 7, 2026
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