Creates test infrastructure with Vitest, xUnit, and pytest
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Type: L3 Worker Category: 7XX Project Bootstrap Parent: ln-740-quality-setup
Sets up testing frameworks, coverage tools, and sample tests for projects.
Does:
Does NOT:
| Technology | Test Framework | Coverage Tool | Config File |
|---|---|---|---|
| TypeScript/React | Vitest | v8/Istanbul | vitest.config.ts |
| .NET | xUnit | Coverlet | *.Tests.csproj |
| Python | pytest | pytest-cov | pytest.ini or pyproject.toml |
Before creating test infrastructure, check what exists.
Files to Check:
| Stack | Test Indicators |
|---|---|
| TypeScript | vitest.config.*, jest.config.*, *.test.ts, *.spec.ts |
| .NET | *.Tests.csproj, *.IntegrationTests.csproj |
| Python | pytest.ini, conftest.py, tests/, test_*.py |
Decision Logic:
Create vitest.config.ts:
Dependencies:
npm install -D vitest @vitest/coverage-v8 @testing-library/react @testing-library/jest-dom jsdom
Create test project:
dotnet new xunit -n {Project}.Tests
dotnet sln add tests/{Project}.Tests
Dependencies (in .csproj):
Add to pyproject.toml or create pytest.ini:
Dependencies:
pip install pytest pytest-cov pytest-asyncio
# OR with uv:
uv add --dev pytest pytest-cov pytest-asyncio
src/
├── components/
│ ├── Button.tsx
│ └── Button.test.tsx # Co-located tests
├── test/
│ └── setup.ts # Test setup file
tests/
├── {Project}.Tests/
│ ├── Controllers/
│ │ └── SampleControllerTests.cs
│ ├── Services/
│ └── {Project}.Tests.csproj
└── {Project}.IntegrationTests/ # Optional
tests/
├── __init__.py
├── conftest.py # Fixtures
├── unit/
│ └── test_sample.py
└── integration/ # Optional
Create one sample test per stack demonstrating:
Shows:
Shows:
Shows:
After setup, verify tests work.
TypeScript:
npm test
npm run test:coverage
Expected: Sample test passes, coverage report generated
.NET:
dotnet test
dotnet test --collect:"XPlat Code Coverage"
Expected: Sample test passes, coverage collected
Python:
pytest
pytest --cov=src --cov-report=term-missing
Expected: Sample test passes, coverage report shown
On Failure: Check test configuration, dependencies, verify sample test syntax.
| Metric | Minimum | Target |
|---|---|---|
| Lines | 70% | 80% |
| Branches | 70% | 80% |
| Functions | 70% | 80% |
| Statements | 70% | 80% |
Configure CI to fail if coverage drops below thresholds.
RULE 1: Coverage thresholds MUST be configured. No exceptions.
RULE 2: Sample tests MUST pass. Don't create broken examples.
RULE 3: Use AAA pattern (Arrange-Act-Assert) in all sample tests.
RULE 4: Co-locate unit tests with source (TypeScript) or use tests/ directory (.NET, Python).
npm test / dotnet test / pytest runs successfully| File | Purpose |
|---|---|
| vitest_template.ts | Vitest config template |
| vitest_setup_template.ts | Test setup file |
| react_test_template.tsx | React component test |
| xunit_csproj_template.xml | .NET test project |
| xunit_test_template.cs | xUnit test example |
| pytest_config_template.toml | pytest config |
| pytest_test_template.py | pytest test example |
| testing_guide.md | Testing best practices |
| Error | Cause | Resolution |
|---|---|---|
| Vitest not found | Not installed | npm install -D vitest |
| jsdom errors | Missing dependency | npm install -D jsdom |
| xUnit discovery fails | SDK version mismatch | Update Microsoft.NET.Test.Sdk |
| pytest not found | Not in PATH | pip install pytest |
| Coverage 0% | Wrong source path | Check coverage.include config |
Version: 2.0.0 Last Updated: 2026-01-10
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Design, implement, and audit inclusive digital products using WCAG 2.2 Level AA standards. Use this skill to generate semantic ARIA for Web and accessibility traits for Web and Native platforms (iOS/Android).
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Whole site or product — a full web accessibility (a11y) audit against WCAG 2.2, following the WCAG-EM methodology. Defines scope, samples representative pages and flows, runs the automated tier (`accessibility-scan`) and the hands-on manual tier (`accessibility-inspect`), and produces one conformance report. Grades each finding by severity and evidence basis, and states per-criterion conformance as pass, fail, or undetermined (needs a human). Use it for 'audit my site for accessibility', 'is this product accessible', 'a11y audit', 'WCAG or Section 508 conformance report', or any multi-page assessment. Assesses; does not fix (use `accessibility-fix`) or diff (use `accessibility-diff`). For a single page use `accessibility-scan`; for hands-on keyboard and screen-reader checks use `accessibility-inspect`.
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Regression check — diff a live page's web accessibility (a11y) violations against a baseline. By default it compares your uncommitted changes (stash-based); pass `--branch [<name>]` to compare against a branch. Reports the new WCAG violations introduced, the ones fixed, and the count of pre-existing ones. Use it for 'did my change break accessibility', 'what a11y issues did this PR add', or as a CI gate. For a full scan of one page use `accessibility-scan`; for a whole site use `accessibility-audit`.
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Remediation only — repair web accessibility (a11y) violations against WCAG 2.2 with a baseline, edit, and verify loop. Takes a target (URL, files, directory) or a findings worklist from `accessibility-scan`/`accessibility-inspect`/`accessibility-audit`, applies mechanical fixes as given, leaves TODOs for visual or contextual judgment, and verifies by re-running the baseline check. It only fixes. To find issues use `accessibility-scan` (one page, automated), `accessibility-inspect` (one page, manual), or `accessibility-audit` (whole site, WCAG-EM); to check for regressions use `accessibility-diff`. Use it for 'fix the a11y issues in X', 'make this accessible', 'add missing alt text and labels', 'apply these accessibility fixes', 'remediate these violations'.
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One page, hands-on manual tier — drive a live page through the web accessibility (a11y) checks a rule engine can't decide: keyboard operation and focus order, screen-reader names, roles and states from the accessibility tree, reflow and zoom, reduced motion, form errors, and target size. Grades each finding by evidence basis (verified / confirm-with-a-human / human-required) and severity, and closes every criterion in a ledger: verified, flagged, not exercised, or N/A. Locates and assesses; does not fix (use `accessibility-fix`). Use it for keyboard testing, focus-order checks, screen-reader or a11y-tree review, reflow and zoom at 200%, or 'is this operable, not just lint-clean'. The automated tier is `accessibility-scan`; `accessibility-audit` runs both across a sampled site.
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One page, automated tier — run the web accessibility (a11y) rule engine against a live page and locate every violation it can detect mechanically. Pass a URL, a config target name (e.g. `accesslint:accessibility-scan dev`), or nothing to use the default target from `accesslint.config.json`. Ensures a debuggable Chrome, runs the @accesslint/core engine over CDP, and returns a worklist of live-DOM WCAG 2.2 violations, each grounded to its DOM selector and source `file:line`. Locates; doesn't edit. Use it for 'is this page accessible', 'check a11y on this URL', 'find contrast and alt-text issues', or to verify a UI change. For hands-on keyboard and screen-reader checks use `accessibility-inspect`; for a whole site or product use `accessibility-audit`; to diff against uncommitted changes or a branch use `accessibility-diff`.
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