Smoke Testing
A smoke test suite that doesn't block deployments is just a report. Reports get ignored. Blocked deployments don't. This guide covers how to wire smoke tests into CI/CD pipelines so failures stop deployments automatically — with patterns for GitHub Actions, GitLab CI, and Jenkins. The Deployment
Testing
After Log4Shell, the security community spent considerable energy debating how attackers got a vulnerable library into so many systems. The answer is uncomfortable: developers added it as a dependency, trusting that upstream had done the right thing. That trust had no cryptographic backing, no audit trail, and no way to
Testing Strategy
Your SLO says 99.9% availability. Your alert rule says it should fire when the error budget is burning 14x faster than sustainable. But has anyone tested whether that alert rule is correct? Whether the error budget calculation accounts for all failure modes? Whether the burn rate math is right?
Testing
CI/CD is the infrastructure of shift-left testing. A well-designed pipeline catches defects in minutes — before code lands in main, before QA sees it, before users are affected. This guide covers how to structure pipeline stages for maximum shift-left benefit: what to run first, how to parallelize,
Testing
DevSecOps applies the shift-left principle to security: instead of a security review at the end of a release cycle, security checks run continuously throughout development. This post covers the practical tools and pipeline configuration for shifting security left — catching vulnerabilities before they reach production. Key Takeaways Security review at
Testing
Serverspec lets you write RSpec tests for server infrastructure. Instead of logging into a box and manually checking whether nginx is running or a firewall rule is in place, you describe the expected state in code and run it as a test suite. Originally created for testing Chef and Puppet
Selenium
Kubernetes is the natural home for Selenium Grid at scale. The Hub is a stateless service that belongs behind a ClusterIP or LoadBalancer. The Nodes are stateless workers that should scale up when there's a test backlog and scale down when the queue is empty. Kubernetes handles exactly
E2E Testing
E2E tests in CI/CD pipelines have a reputation for being slow, fragile, and the first thing teams disable under time pressure. That reputation is deserved—when E2E tests are added as an afterthought to an existing pipeline, they're usually all of those things. This guide covers how
Testing
Security controls fail silently. A broken authentication check doesn't throw an exception—it returns 200 where it should return 403. A rate limiter with an off-by-one error doesn't log a warning—it just lets the attack through. And because security failures are often hard
Docker
Dockerfiles are code. Treat them like code. Use hadolint to catch anti-patterns at write time, container-structure-test to verify what your image actually contains, and layer inspection to keep builds lean and fast. This guide walks through a practical testing pipeline for Dockerfiles from lint to CI enforcement.
Testing
Docker networks and volumes are often taken for granted in test setups, but they're the source of subtle bugs that only appear in multi-container environments. This guide covers how to test network connectivity between containers, validate volume behavior, and catch data persistence issues before production. Why Network
Docker
Docker HEALTHCHECK defines a command Docker runs periodically to determine container health. This guide covers writing HEALTHCHECK instructions, using health status in Compose depends_on conditions, testing health checks in CI, and debugging containers stuck in "starting" or "unhealthy" states. A running container is not necessarily