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Running LWC Accessibility Jest Tests

Run Sa11y accessibility unit tests on Lightning Web Components in either:

• Core (Bazel) — when a WORKSPACE file is present.
• Standalone (Jest) — when there's no WORKSPACE.

Selenium-level reproductions, GUS A11yBug ingestion, and other internal Salesforce-only flows are out of scope for this skill. For source-code-level WCAG review without running tests, see experience-lwc-accessibility-validate.

When to Use This Skill

• User wants to run accessibility unit tests (Sa11y Jest) locally before pushing a fix.
• User has a known failing test file path (e.g. from an A11yBug's Test_Names__c) and wants to target it directly.
• User is iterating on an accessibility fix and needs the fastest pass/fail signal.

Prerequisites

• For Bazel Jest tests: a Salesforce core build environment (a WORKSPACE file is present).
• For standalone Jest tests: @sa11y/jest installed and configured.

Workflow

Follow running-sa11y-jest-tests.md. Pick the correct mode:

• Core (Bazel) — use when WORKSPACE is present. Prefer single-file targets (//{moduleName}:{relativePath}) over module targets when the failing test file path is already known (.test.js extension dropped). Bazel commands must pass --test_env=SA11Y_AUTO=1 --test_env=SA11Y_ENABLE_DOM_MUTATION_OBSERVER=1; when debugging, add SA11Y_ENABLE_RENDERED_DOM_SAVE=1 with the documented save path to avoid EPERM issues.
• Standalone (Jest) — use when there's no WORKSPACE. Run npm test -- --testMatch="**/*.accessibility.test.js" for the whole suite, or npm test -- <file> targeting the file by the name/path given in the prompt (a bare filename when it is "in this directory"). Do not prepend SA11Y_* env vars in standalone mode — Sa11y runs automatically because @sa11y/jest is wired into the project's Jest setup; no extra environment variables are needed.

Answer only what is asked. Emit just the command(s) the prompt requests plus the exit-code meaning. Do not pad the plan with unrequested variants (watch, coverage, verbose), snapshot-update steps, or HTML-save sections unless the user explicitly asks for them.

Verification Checklist

• Sa11y Jest run completed with a clear pass/fail signal (exit 0 or 3 for Bazel; exit 0 or 1 for Jest).
• If snapshots were intentionally updated, the new snapshots are committed alongside the fix.

Troubleshooting

• Bazel test "not found" — the target path is off. Remember to drop the .test.js extension in {relativePath}.
• HTML saving fails with EPERM — use the prescribed save path sfdc-test/unit/javascript/htdocs/sa11y/jest.