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Test Automation

E2E Testing TanStack Router SPAs with Playwright: Navigation, Search Params, Nested Layouts

TanStack Router SPAs use client-side navigation — no full page reloads, history managed by the router, search params validated by Zod. Playwright handles all of this well, but you need to account for how the SPA manages state and URL. This guide covers Playwright E2E testing for TanStack Router: client-side navigation,

Test Automation

Testing TanStack Form: Validation, Async Submission, and Field Arrays

TanStack Form is a headless form library with built-in TypeScript support, field-level validation, async submission, and field arrays. Its headless design means your tests interact with real DOM elements through the form library's state — which makes Testing Library an ideal fit. This guide covers testing TanStack Form: field

Test Automation

Testing React Server Components: RSC, Streaming, and Suspense Boundaries

React Server Components (RSC) run exclusively on the server. They can read from databases, call internal APIs, and access the filesystem — none of which is available in a jsdom environment. This creates a fundamental mismatch: your existing client-side testing tools won't work out of the box. This guide

Test Automation

React Compiler Testing: How React Forget Changes memo and useCallback Strategies

React Compiler — previously called React Forget — automatically memoizes your components and hooks. It eliminates the need for manual React.memo(), useCallback, and useMemo in most cases. This is a significant shift: tests that were written to verify memoization behaviour may now be testing something the compiler handles, or testing assumptions

Test Automation

React 19 Testing Guide: useOptimistic, useFormStatus, and use() with Vitest

React 19 shipped a handful of hooks that change how you think about async state, form handling, and data loading. Most of your existing tests still work — but the new hooks introduce async patterns that need deliberate test strategies. This guide covers testing useOptimistic, useFormStatus, and the new use() hook

Test Automation

Testing Partial Prerendering (PPR) in Next.js 15: Static Shell and Dynamic Content

Partial Prerendering (PPR) is Next.js 15's hybrid rendering strategy: the static shell of a page is served instantly from the CDN edge, while dynamic content streams in behind Suspense boundaries. A single page can have both a prerendered header and a live-fetched product listing — without a full

Test Automation

Next.js 15 App Router Testing: Layouts, Loading, Error, and Route Handlers

Next.js 15 App Router introduced a file-based convention that determines how your application behaves in loading, error, and layout states. Each file — layout.tsx, loading.tsx, error.tsx, not-found.tsx — plays a distinct role, and each one needs tests that match its purpose. This guide covers how to test

Test Reporting

ReportPortal: Self-Hosted Test Reporting for Large Teams

At a certain scale, spreadsheets and CI artifact tabs break down as test reporting solutions. When dozens of QA engineers run thousands of tests daily across multiple projects, you need a dedicated test reporting platform. ReportPortal is the open-source answer to that problem. What Is ReportPortal? ReportPortal is a self-hosted

Background Jobs

Async Worker Patterns: Testing Idempotency, Dead-Letter Queues, and Backpressure

Background job systems fail in complex ways. A job can run twice due to a retry. A downstream service can be slow, causing queue buildup. A crash during execution can leave data in an inconsistent state. Testing these scenarios requires specific patterns that go beyond simple pass/fail test cases.

Python

Celery Task Testing with pytest: Mocking, Retries, and Chaining

Celery powers background task processing in Python applications. It's powerful but notoriously tricky to test because of its asynchronous, distributed nature. The good news: Celery ships with testing infrastructure that makes most scenarios straightforward. The tricky parts — retries, chains, countdown — require some extra care. Core Testing Modes CELERY_

Background Jobs

Faktory Worker Testing: Job Deduplication and Failure Handling

Faktory is a language-agnostic background job server created by Mike Perham (the creator of Sidekiq). Unlike Sidekiq, which is Redis-based and Ruby-only, Faktory is a standalone server with client libraries for Ruby, Go, Python, JavaScript, and other languages. Testing Faktory workers shares concepts with other queue systems but has important

Ruby on Rails

Testing Sidekiq Jobs in Rails: Unit, Integration, and Retry Logic

Background jobs are a core part of most Rails applications — email delivery, image processing, webhook dispatch, data export. But they're also one of the most commonly undertested parts of a codebase. Jobs execute asynchronously in production, making failures easy to miss and hard to debug. Sidekiq is the