Testing
A/B testing infrastructure is code, and code needs tests. This guide covers testing the experiment layer itself: variant assignment consistency, statistical significance calculations, minimum detectable effect, sample size requirements, and percentage rollout correctness—not just whether the feature exists behind the flag. Testing the Test Infrastructure Most teams write
Testing
Playwright can automate the browser half of email flows—fill out forms, trigger emails—but it can't read inboxes. Connecting Playwright to IMAP lets you complete the loop: trigger an action in the browser, wait for the email to arrive via IMAP, extract the OTP or link, then
AI Testing
Real test data is scarce, sensitive, and hard to maintain. LLMs can generate realistic synthetic test data at scale — covering edge cases that real datasets miss and eliminating PII concerns. This guide covers practical techniques for generating test data with LLMs: schema-based generation, edge case discovery, data augmentation, and
DevOps
Atlantis automates Terraform plan and apply through pull requests. But Atlantis itself needs testing: workflow configuration, plan output validation, policy enforcement, and server health checks. This guide covers testing Atlantis workflows locally with atlantis-local, validating plan outputs with custom scripts, enforcing Terraform policies with OPA and Conftest, and monitoring
Testing
SendGrid and AWS SES both offer sandbox modes for testing without sending real emails. Beyond sandbox, you need to test delivery event webhooks (bounce, complaint, open, click) and mock the SDK in unit tests. This guide covers the full testing stack for both providers. What Transactional Email Testing Covers Testing
API Testing
Tyk is an open-source API gateway that manages authentication, rate limiting, analytics, and API versioning through a declarative API definition system. Unlike gateways that use UI-driven configuration, Tyk stores its entire configuration as JSON documents — which means you can version-control it and write automated tests against it.
Testing
Software templates and scaffolding tools bootstrap new projects, services, and components. When templates work correctly, developers get a fully wired-up starting point — CI/CD configured, linting set up, tests passing. When templates have bugs, every new project starts with broken infrastructure that nobody notices until it's too
Testing
Port.io is an internal developer portal (IDP) platform that lets platform teams model their software catalog, define quality scorecards, and build self-service workflows for developers. When Port is the system of record for your services and infrastructure, testing its configuration becomes as important as testing application code. This
API Testing
Okta is the identity layer for many enterprise applications. Testing Okta integrations is challenging because identity flows involve browser redirects, SAML assertions, multi-step authentication, and external callback URLs. But untested auth is the most dangerous untested code — a broken login means no users can access your application. This guide
Testing
Internal developer platforms (IDPs) are infrastructure for your engineers. When they break, all development stops. Yet most platform teams define SLOs for their user-facing products while running their own IDPs on vibes and hope. This guide covers how to define meaningful SLOs for developer platforms, test them with chaos
Envoy
Envoy is the data plane proxy behind Istio, AWS App Mesh, and Contour. It handles routing, load balancing, authentication, rate limiting, and observability for your services. When Envoy is misconfigured, the symptoms are subtle — requests fail under specific conditions, rate limits don't enforce correctly, or health checks pass
API Testing
AWS Cognito provides user authentication, authorization, and identity management for AWS-hosted applications. Testing Cognito integrations is critical — a misconfigured user pool can lock users out, a broken Lambda trigger can block all signups, and a wrong JWT audience claim can silently reject valid users. This guide covers testing Cognito