Mono is a platform for running and developing applications based on the ECMA/ISO Standards. Mono is an open source effort led by Novell. Mono provides a complete CLR (Common Language Runtime) including compiler and runtime, which can produce and execute CIL (Common Intermediate Language) bytecode (aka assemblies), and a class library. . This package contains NUnit which is a unit testing framework. It serves the same purpose as JUnit does in the Java world. It supports test categories, testing for exceptions and writing test results in plain text or XML.