Agent Skills

Design statistically sound A/B experiments: hypothesis testing, sample size calculation, metric selection, guardrail metrics, and experiment lifecycle.

Checks

Metadata only

Evidence

1 source

Systematically test web applications end-to-end: write test plans, execute browser flows, and report coverage gaps.

Checks

Metadata only

Evidence

1 source

Validate API responses against OpenAPI schemas automatically; catch breaking changes with schema diffing in CI pipelines.

Checks

Metadata only

Evidence

1 source

Write Behavior-Driven Development tests with Cucumber, Gherkin scenarios, step definitions, living documentation, and Playwright integration.

Checks

Metadata only

Evidence

1 source

Apply chaos engineering: hypothesis design, Chaos Monkey, LitmusChaos experiments, fault injection, and steady-state analysis.

Checks

Metadata only

Evidence

1 source

Implement consumer-driven contract testing with Pact: consumer/provider tests, Pact Broker, can-i-deploy, and CI integration.

Checks

Metadata only

Evidence

1 source

Write Cypress component and E2E tests: custom commands, network stubbing with cy.intercept, and CI parallelization strategies.

Checks

Metadata only

Evidence

1 source

Design and implement E2E test suites with Playwright or Cypress covering user journeys, assertions, and CI integration.

Checks

Metadata only

Evidence

1 source

Design k6 load tests: virtual users, scenarios, thresholds, extensions, Grafana integration, and performance regression testing.

Checks

Metadata only

Evidence

1 source

Apply microservices patterns: service discovery, circuit breakers, saga, API gateway, and contract testing for distributed systems.

Checks

Metadata only

Evidence

1 source

Use mutation testing to measure test effectiveness: Stryker for JS/TS, Mutmut for Python, and interpreting mutation scores.

Checks

Metadata only

Evidence

1 source

Write reliable Playwright E2E tests: page object model, fixtures, auto-waiting, trace viewer debugging, and parallel sharding.

Checks

Metadata only

Evidence

1 source

Write property-based tests with fast-check (JS), Hypothesis (Python), and QuickCheck (Haskell): generators, shrinking, and stateful testing.

Checks

Metadata only

Evidence

1 source

Use snapshot testing effectively: Jest/Vitest snapshots, inline vs file snapshots, review workflows, and avoiding brittle snapshots.

Checks

Metadata only

Evidence

1 source

Apply a hypothesis-driven debugging loop: observe the symptom, form a hypothesis, design a targeted test, and verify — repeat until root cause is found.

Checks

Metadata only

Evidence

1 source

Build maintainable test data with factory patterns: Factory Bot-style builders, Faker.js data generation, and fixture composition.

Checks

Metadata only

Evidence

1 source

Apply TDD red-green-refactor cycle: unit test design, test doubles (mocks/stubs/spies), outside-in TDD, and ZOMBIES testing heuristic.

Checks

Metadata only

Evidence

1 source

Catch visual regressions with Percy, Chromatic, or Playwright screenshots: snapshot testing, baseline management, and CI integration.

Checks

Metadata only

Evidence

1 source

Implement WCAG 2.2 compliance: ARIA roles, keyboard navigation, focus management, color contrast, and screen reader testing patterns.

Checks

Metadata only

Evidence

1 source

Scrape web data ethically with Playwright, Cheerio, and Scrapy: robots.txt compliance, rate limiting, anti-bot avoidance, and structured extraction.

Checks

Metadata only

Evidence

1 source