DevOps
Crossplane Compositions are Kubernetes-native infrastructure templates that expand a simple XR claim into tens of managed resources. A bug in a Composition can delete a production RDS instance when someone creates a new database claim. This guide covers how to test Composition logic with crossplane beta render, unit-test patch-and-transform functions,
Database
CockroachDB's distributed architecture introduces failure modes that standard database tests miss: transaction conflicts requiring retries, serializable isolation violations, and behavior under network partition. Your test suite needs to cover all three to have confidence in production. Key Takeaways Transaction retry logic is not optional in CockroachDB. The database
DevOps
Backstage plugins live at the intersection of React frontend, Node.js backend, and Backstage's entity catalog — which makes them surprisingly tricky to test. This guide walks through unit testing plugin backends with @backstage/test-utils, integration-testing catalog API interactions, and running Cypress E2E tests against a real Backstage instance.
Testing
Every third-party API integration needs tests — but mocking, contract testing, and real integration testing each have different tradeoffs. Mocks are fast but drift from reality. Real integration tests are accurate but slow and expensive. Contract tests are the middle ground that most teams miss. This guide covers when to use
Game Development
Beyond basic assertions, GUT provides mock objects, spy capabilities, and signal testing that let you isolate and verify complex game behavior. This guide covers GUT's advanced features: creating doubles (mocks/stubs), asserting method calls, testing signal emissions, and testing scene interactions in GDScript. Key Takeaways GUT doubles (mocks)
Testing
OAuth2 integrations are painful to test in CI because the authorization code flow requires a browser and human interaction. This guide covers how to test OAuth2 without browser automation: mocking the token exchange, testing the callback handler, validating token storage, testing refresh flows, and running full browser-based auth tests with
Testing
Slack bot testing requires handling signed webhooks, validating Block Kit UI components, testing slash command responses, and simulating event payloads. This guide covers unit testing with mock payloads, integration testing with the Slack SDK's built-in test utilities, and end-to-end testing with Socket Mode. Slack bots have more failure
Game Development
GUT (Godot Unit Test) is the de facto unit testing framework for Godot games. It integrates directly into the Godot editor, lets you write tests in GDScript alongside your game code, and runs headlessly for CI pipelines. This guide covers installation, writing your first tests, and the assertion API. Key
Testing
SendGrid provides a sandbox mode that validates emails without sending them, dynamic templates you can test independently, and event webhooks for tracking delivery status. This guide covers testing SendGrid integrations at every level: sandbox validation, template rendering, webhook handling, and deliverability simulation. Email bugs are subtle and slow to surface.
Testing
Twilio provides test credentials that accept API calls without sending real messages, specific magic phone numbers for simulating delivery failures, and a webhook testing workflow for voice and SMS. This guide covers unit testing Twilio integrations with mocks, integration testing with test credentials, and testing TwiML responses. Twilio integrations fail
Testing
Go's testing package has no built-in snapshot testing, but two libraries fill the gap: cupaloy (simpler, widely used) and go-snaps (more features, testify integration). Both capture test output to files, compare on future runs, and update via an environment variable flag. This guide covers both with practical examples.
Testing
Stripe provides a test mode with real API behavior, test card numbers for different scenarios, and a CLI for webhook testing. Testing a payment integration requires covering happy-path charges, declined cards, 3D Secure flows, webhook receipt and idempotency, refunds, and subscription lifecycle events. This guide covers all of them. Payment