What is chai and chai-http in Node.js userland?

Chai is a Behavior-Driven Development (BDD) / Test-Driven Development (TDD) assertion library for Node.js and the browser that can be paired with any JavaScript testing framework. It provides developers with a rich set of assertions that can be written in a readable and expressive language, essentially allowing tests to be written in a way that resembles natural language. Chai offers several assertion styles such as expect, should, and assert, giving developers the flexibility to choose the style that best fits their needs or preferences[1][3].

Chai-HTTP is a plugin for Chai that allows HTTP integrations to be tested with ease. It extends Chai's assertion capabilities to work with HTTP requests, enabling developers to write tests for RESTful APIs or any HTTP server in a simple and expressive way. With Chai-HTTP, developers can make HTTP requests within their test cases and then use Chai assertions to verify the responses, including the status code, headers, body, and more. This is particularly useful for testing endpoints of web applications, where you can simulate GET, POST, PUT, DELETE, and other HTTP meth...