Testing Library: which query is a Chrome add-on developed by Ben Monro. It falls under the category of Browsers and is specifically categorized as an Add-ons & Tools subcategory. This add-on is designed to enhance your testing experience by providing best practices and guidance from the testing library.

The main features of Testing Library: which query include the ability to copy queries from any web page, an Elements Inspector Panel, and the ability to play with queries directly in the dev tools console window. With these features, you can easily improve your tests and ensure that they follow the recommended practices provided by the testing library.

If you're looking for a way to enhance your testing process and make it more efficient, Testing Library: which query is a valuable tool to consider. It provides a convenient way to work with queries and improve your testing workflows.