If you want a tool to write unit tests for you in your development environment, Supertest is a great option. This VS Code extension uses AI to generate unit tests automatically, saving you a lot of time on manual testing. It has features like automatically adding test IDs with a click or keybinding and generating unit tests in seconds with a right-click or keybinding. Supertest supports the React Testing Library for now but plans to add support for other testing libraries, so it's a good option for developers.
Another contender is CodeAI, another VS Code extension that uses AI to help you write code, generate unit tests and create documentation. It supports several programming languages, and you can use it for code completion and test generation. CodeAI is designed to help developers be more productive by giving them more time for higher-level work, so it's a good option if you want to boost your productivity.
If you want a more complete solution, CodeComplete is a collection of AI-powered coding tools, including automated unit test generation. It's self-hosted, so it's geared for enterprise customers, with features like analytics and the ability to keep code and data on your own premises with on-premise or VPC deployments. If you want more features and customization options for your testing needs, it's a good option.