testing▌

Property-based testing verifies that code satisfies general properties or invariants for a wide range of automatically generated inputs, rather than testing specific examples. This approach finds edge cases and bugs that example-based tests often miss.

Opinionated, production-tested Playwright guidance — every pattern includes when (and when not) to use it.

Design and execute reliable, cost-aware mobile testing across iOS and Android (native + cross-platform).

dbt unit tests validate SQL modeling logic on static inputs before materializing in production. If any unit test for a model fails, dbt will not materialize that model.

Use this skill when:

Provides WCAG 2.1/2.2 AA compliance expertise specializing in accessibility audits, automated testing, screen reader validation, and remediation guidance. Ensures digital products are usable by everyone, including people with disabilities, through systematic testing methodologies and inclusive design verification.

<default_to_action> When designing or improving test automation:

Comprehensive TDD patterns and practices for all programming languages. This skill eliminates ~500-800 lines of redundant testing guidance per agent.

Patterns for writing acceptance tests using terraform-plugin-testing with the Plugin Framework.

a/b-test-analysis