Sinon.js assertions for should.js

 should is an expressive, readable, framework-agnostic assertion
 library. The main goals of this library are to be expressive and to
 be helpful. It keeps your test code clean, and your error messages
 helpful.
 .
 This module adds additional assertions for sinon.js, which provides
 standalone test spies, stubs and mocks.
 .
 Node.js is an event-based server-side JavaScript engine.