JUnit 5 assertThrows: Verify Exceptions with a Simple Example
Learn how to use JUnit 5's assertThrows to verify exceptions, see a concrete code example, and avoid common pitfalls.
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junit
javaUsing Vitest Snapshots to Catch Unintended Changes in Complex Objects
Learn how Vitest's snapshot matcher helps detect regressions in nested data, when to update snapshots, and why over‑reliance can hide real bugs.
vitestUsing Flask's Application Factory for Clean Configuration and Testing
Learn how Flask's application factory pattern creates isolated app instances, simplifies testing, and avoids extension state leaks—complete with a minimal code example and practical verification steps.
Mocking API Responses with Puppeteer Request Interception in Automated Tests
Learn how to mock a specific API call in Puppeteer using request interception to achieve deterministic UI tests without changing the backend.
nodejs
puppeteerWhy Swap Jest for Node.js’s Built‑In Test Runner
Node.js’s native test runner lets you write and run unit tests with zero dependencies. This blog walks through a concrete example, shows how to enable coverage and mocking, and explains when the trade‑offs make it the right choice for backend services.
Blocking Images and Fonts with Puppeteer Request Interception: When It's Worth It
Puppeteer's request interception can block images, fonts, and trackers to cut bandwidth and runtime in scraping and CI — if you resolve every request and measure the actual savings.
Using Solidity Custom Errors for Gas‑Efficient and Type‑Safe Reverts
Learn how Solidity custom errors (since 0.8.4) cut deployment size, provide typed revert data, and simplify testing—complete with a token‑gated example, trade‑offs, and verification steps.
solidityUsing Jest Snapshot Tests to Catch UI Regressions Early
Learn how Jest snapshot testing captures component output to detect unintended UI changes, with a concrete Button example, setup steps, and practical limitations.
jest
reactPytest Fixture Scopes: Balancing Speed and Isolation in Real‑World Tests
When an expensive setup runs for every test, you’ll want a broader fixture scope. But widening scope can hide subtle test‑coupling bugs. This post explains how to pick the right scope, shows a concrete database example, and warns about the trade‑offs you’ll face.
pytest
python