Mocha can refer to: (1) A feature-rich JavaScript test framework running on Node.js and the browser; (2) A Ruby library for mocking and stubbing with built-in support for support for MiniTest and Test::Unit.

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The default test runner for Angular is Karma, which makes sense as it was written by them. There are several options out there for the framework, and I personally prefer using Mocha as it runs on Node.js.