Best 11 Tools for Writing Unit Tests in 2025

JetBrains AI is a set of AI-powered tools built directly into JetBrains development environments. It includes two main parts: AI Assistant and Junie.

TestSprite is a fully autonomous AI-powered testing platform built to handle the complete software testing lifecycle without manual intervention. Think of it as an AI QA engineer that never sleeps.

Bruno is an "offline-first API client" that revolutionizes how developers test and manage APIs. Instead of forcing you to create accounts or store data in the cloud, Bruno saves everything directly on your device using a simple text format called "Bru."

Kiro AI is an agentic Integrated Development Environment built to deliver structured, production-ready software development through spec-driven methodology. Think of it as a combination of traditional IDEs and AI planning tools, but much smarter. It uses advanced language models and incorporates intelligent agents that can analyze, plan, and implement complex software features autonomously.

GitHub Copilot is an AI-powered code completion tool that integrates directly into popular code editors like Visual Studio Code, Visual Studio, and JetBrains IDEs. It uses advanced machine learning models trained on billions of lines of public code to understand what you're trying to build and suggest entire lines or functions in real-time.

Augment Code is an AI-powered software development platform built to help professional engineers work with large, established codebases. Think of it as having a smart coding partner who knows your entire project inside and out.

Cursor is an AI-powered integrated development environment (IDE) that combines the familiar interface of Visual Studio Code with advanced artificial intelligence capabilities. Think of it as your regular code editor supercharged with a smart AI assistant that understands your entire project.

Windsurf is an AI-powered integrated development environment designed to revolutionize how developers write code. Think of it as VS Code supercharged with advanced AI capabilities that truly understand programming.

Trae AI is an advanced integrated development environment that brings artificial intelligence directly into your coding workflow. Built on the popular VS Code foundation, it offers a familiar interface enhanced with powerful AI capabilities that understand your code, suggest improvements, and help you build applications from scratch.

Zed is a high-performance, multiplayer code editor designed from the ground up for speed and collaboration. Created by the team behind Atom, Electron, and Tree-sitter, Zed represents over 15 years of experience building developer tools.