testing Archives - ITFROMZERO - Share tobe shared!

Mutation Testing with Stryker in TypeScript: Escaping the False Sense of Code Coverage

By IT From Zero October 16, 2026

High code coverage doesn't mean your test suite actually catches bugs. Learn how to use Stryker for Mutation Testing in TypeScript to reveal the true quality of your tests.

Docker

Setting Up LocalStack with Docker Compose: Emulate AWS S3, SQS, and DynamoDB Locally

By IT From Zero October 4, 2026

A comparison of 3 AWS emulation approaches for local development and a step-by-step guide to configuring LocalStack with Docker Compose for offline testing and cloud cost savings.

Python

Snapshot Testing with Pytest-snapshot: Stop Struggling with Manual Assertions

By IT From Zero September 25, 2026

Learn how to use Pytest-snapshot to automate JSON and HTML data testing. A solution to help Python developers escape the nightmare of manual assertions.

Database

Mastering Database Seeding: Best Practices for Smart and Secure Mock Data

By IT From Zero September 21, 2026

Database Seeding is more than just generating junk data. Learn about Factory Patterns, Deterministic Seeding, and how to protect Production data for professional developers.

Python

Torturing Your Python Code with Hypothesis: Finding Logic Bugs Automatically with Property-based Testing

By IT From Zero June 18, 2026

Don't let bugs slip through due to missing edge cases in unit tests. Learn how to use the Hypothesis library in Python to automatically generate test data and find logic bugs using Property-based Testing.

Development

Vitest Guide: ‘Hack’ Unit Test Speed for Vite, React, and Vue Projects

By IT From Zero May 25, 2026

Is Jest's slowness driving you crazy? Switch to Vitest. This guide shows how to set up Vitest for React and Vue with 10x faster execution, making Unit Testing easier than ever.

Development

LocalStack: Simulate AWS S3, Lambda, DynamoDB Locally — Completely Free

By IT From Zero April 18, 2026

LocalStack lets you emulate AWS S3, Lambda, and DynamoDB locally using Docker, no real AWS account needed. This guide covers setup, a comparison with alternative approaches, and pytest integration for running integration tests completely offline.