Add topic "Chai"

topics/chai/index.md

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+---
+aliases: chaijs
+created_by: Jake Luer, Keith Cirkel, Lucas F. da Costa, Grant Snodgrass, vesln
+released_at: Dec 7, 2011
+display_name: Chai
+github_url: https://github.com/chaijs
+url: https://www.chaijs.com/
+logo: chai.png
+related: tdd, bdd, javascript, nodejs, mocha, jest, qunit, assert
+topic: chai
+short_description: Chai is a BDD/TDD assertion library for node and the browser.
+---
+**Chai** is a BDD/TDD assertion library, similar to Node's built-in assert, for node and the browser that can be paired with any JavaScript testing framework.