Testing

Implement consumer-driven contract testing with Pact to verify that APIs and clients agree on their interface without full integration tests.

Test migrations for backwards compatibility, forwards compatibility, rollback safety, and data integrity. Catch schema-code mismatches before deployment.

Master Helm chart design with sensible defaults, comprehensive testing, and promotion pipelines. Scale from single-chart deployments to Helmfile-orchestrated multi-chart platforms.

Implement hexagonal architecture to keep your domain logic framework-agnostic and testable, with ports defining contracts and adapters providing implementations.

Test Terraform modules with Terratest, enforce policies with OPA/Conftest, scan with tfsec, and catch infrastructure bugs in CI before deployment.

Move beyond Jest mocks. Use Vitest for ESM support and speed, TestContainers for real databases, MSW for HTTP mocking, and contract testing with Pact for production confidence.

Comprehensive penetration testing checklist: IDOR, authentication bypass, rate limiting, XXE, SSRF, mass assignment, GraphQL introspection, API fuzzing, and ZAP integration.

Manage prompts with version control, automated regression testing, eval datasets, A/B testing in production, and canary deployments for safe prompt evolution.

Use TestContainers to run real PostgreSQL, Redis, and Kafka in tests. Isolate data per test, parallelize safely, and catch integration bugs before production.