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[9.4] [CI] Enable Jest selective testing by default on PRs (#266326) #266397

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Merged
kibanamachine merged 1 commit into from
Apr 29, 2026
Merged

[9.4] [CI] Enable Jest selective testing by default on PRs (#266326) #266397

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4 changes: 4 additions & 0 deletions .buildkite/pipeline-utils/affected-packages/README.md
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Expand Up @@ -129,3 +129,7 @@ const filteredFiles = filterFilesByPackages(
2. Return affected project IDs

**Performance**: ~5-7 seconds

## PR Jest selective testing

On pull request builds, Jest unit and integration test groups are narrowed to configs under affected packages (see `pick_test_group_run_order` in CI stats). Add the GitHub label `ci:prevent-selective-testing` to run the full Jest suite instead. Touching files listed in `CRITICAL_FILES_JEST_*` in `const.ts` also skips filtering for the relevant test type.
2 changes: 1 addition & 1 deletion .buildkite/pipeline-utils/affected-packages/const.ts
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Expand Up @@ -9,7 +9,7 @@

export const UNCATEGORIZED_MODULE_ID = '[uncategorized]';

export const SELECTIVE_TESTS_LABEL = 'ci:use-selective-testing';
export const PREVENT_SELECTIVE_TESTS_LABEL = 'ci:prevent-selective-testing';

// Changes here skip affected-package filtering for Jest (full run).
// Keep narrow: global test harness, transforms, CI selection.
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11 changes: 8 additions & 3 deletions .buildkite/pipeline-utils/ci-stats/pick_test_group_run_order.ts
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Expand Up @@ -27,15 +27,20 @@ import {
getAffectedPackages,
listChangedFiles,
filterFilesByPackages,
SELECTIVE_TESTS_LABEL,
PREVENT_SELECTIVE_TESTS_LABEL,
CRITICAL_FILES_JEST_UNIT_TESTS,
touchedCriticalFiles,
CRITICAL_FILES_JEST_INTEGRATION_TESTS,
} from '../affected-packages';
import { collectEnvFromLabels, expandAgentQueue, getRequiredEnv } from '#pipeline-utils';

// TODO: this is always false on on-merge, when switching to enable this by default, check if this is a PR
const USE_SELECTIVE_TESTING = process.env.GITHUB_PR_LABELS?.includes(SELECTIVE_TESTS_LABEL);
const prLabels =
process.env.GITHUB_PR_LABELS?.split(',')
.map((l) => l.trim())
.filter(Boolean) ?? [];
const isPrBuild = Boolean(process.env.GITHUB_PR_NUMBER);
const preventSelectiveTesting = prLabels.includes(PREVENT_SELECTIVE_TESTS_LABEL);
const USE_SELECTIVE_TESTING = isPrBuild && !preventSelectiveTesting;

const SHARD_ANNOTATION_SEP = '||shard=';
/**
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