Test automation tutorials, frameworks, and tools — from first scripts to full CI/CD pipelines.
Test Automation
Sidekiq is the standard background job processor for Ruby on Rails. Testing Sidekiq workers well requires understanding three modes: fake (in-memory queue, no Redis), inline (synchronous execution), and real (full Redis-backed queue). Each mode serves a different testing layer. Setup # Gemfile gem 'sidekiq' gem 'sidekiq-testing', group:
Test Automation
Video transcoding is inherently async, slow, and hard to test in unit tests. The processing takes minutes, produces binary output, and depends on external services like AWS MediaConvert or Mux. This guide shows how to test video processing pipelines by separating fast unit tests (job orchestration, webhook handling) from integration
Test Automation
WebRTC is notoriously hard to test. Real cameras and microphones aren't available in CI, peer connections involve NAT traversal, and the media pipeline has timing dependencies that make flaky tests common. This guide shows how to test WebRTC applications reliably using Playwright's built-in fake media capabilities.
Test Automation
Rate limiting bugs in SaaS applications come in two flavors: limits that are too strict (blocking legitimate users) and limits that don't work at all (letting abuse through). Both are costly. This guide covers how to test per-tenant rate limiting, burst handling, quota enforcement, and 429 response behavior.
Test Automation
Role-based access control (RBAC) bugs are subtle and expensive. A viewer who can delete records, an admin whose permissions don't cascade to subresources, or a billing role that can access user PII — these bugs are invisible until someone exploits them. This guide shows how to build a systematic
Test Automation
Image processing pipelines are tricky to test because they produce binary output that's hard to assert on directly. The key is extracting metadata and dimensions rather than comparing raw bytes, and separating the pipeline logic from the cloud SDK calls. This guide covers testing Sharp transformations, Cloudinary integrations,
Test Automation
Tenant isolation is the most critical security property of a multi-tenant SaaS application. A bug that allows Tenant A to read Tenant B's data is a catastrophic breach — and it's the kind of bug that standard happy-path tests never catch. This guide covers how to systematically
Test Automation
File upload bugs are painful: silent failures, incorrect MIME type handling, size limit bypasses, and S3 permissions that work in dev but fail in production. This guide covers how to test multipart uploads, presigned URL flows, and file download with Jest and Supertest — without hitting real S3. Setup npm install
Test Automation
Celery is Python's most popular distributed task queue. Testing Celery tasks well means covering task logic in isolation, testing how tasks interact with the broker and result backend, and verifying retry behaviour. This guide shows how to do all three with pytest. Setup pip install celery redis pytest
Test Automation
BullMQ is the most widely used Node.js job queue library, built on Redis. Testing it well means covering three separate concerns: the producer that enqueues jobs, the worker that processes them, and the retry/failure handling when things go wrong. This guide shows how to do all three with
Test Automation
Audio applications are hard to test because the output is binary and subjective. Testing speech-to-text accuracy, validating TTS output quality, and verifying podcast processing pipelines all require different strategies. This guide covers practical approaches that give you reliable automated test coverage without requiring audio playback. Testing Speech Recognition Integration Mocking
Test Automation
Background jobs are where most applications hide their most dangerous bugs. A payment job that fires twice, an email job that breaks silently, a report job that fails after 2 hours of work — these failures cost real money and erode user trust. This guide covers the cross-framework testing patterns that