https://sohilladhani.com/blog/tags/testing/Recent content in Testing on Sohil Ladhani BlogHugoen-usThu, 26 Mar 2026 00:00:00 +0000https://sohilladhani.com/blog/post/2026-03-26-testing-eventually-consistent-systems/Thu, 26 Mar 2026 00:00:00 +0000https://sohilladhani.com/blog/post/2026-03-26-testing-eventually-consistent-systems/Write to primary. Read from replica. Assert. Fails intermittently. The classic flaky test in distributed systems. It’s not a bug in your code. It’s a bug in your test: you’re testing an eventually consistent system with strong-consistency assertions. This confused me for longer than I’d like to admit. The Polling Pattern The simplest fix: poll until the assertion passes or a timeout expires. @Test void userUpdateEventuallyPropagates() { // Write to primary userService.https://sohilladhani.com/blog/post/2026-03-25-contract-testing-in-microservices/Wed, 25 Mar 2026 00:00:00 +0000https://sohilladhani.com/blog/post/2026-03-25-contract-testing-in-microservices/Service A returns a user object. Service B expects that object to have a name field. Team A renames it to fullName. Their tests pass. Team B’s tests pass (they mock Service A’s response). In production, Service B crashes with a null pointer because name doesn’t exist anymore. End-to-end tests should catch this, right? Maybe, if they’re up to date, if they cover this path, if they run in a shared environment.https://sohilladhani.com/blog/post/2026-03-24-chaos-engineering-and-fault-injection/Tue, 24 Mar 2026 00:00:00 +0000https://sohilladhani.com/blog/post/2026-03-24-chaos-engineering-and-fault-injection/All tests pass. 100% of health checks green. Monitoring looks beautiful. Then a single Redis node goes down, and your checkout flow returns 500s for 20 minutes. Your circuit breaker was configured but never actually triggered in production. It had a bug. You never knew because you never broke Redis on purpose. Chaos engineering is the practice of deliberately injecting failures to find these gaps before your users do. The Steady-State Hypothesis Before breaking anything, define what “normal” looks like.