More assert functions for type checks please

Hi there

Other well-known test frameworks like tap have more assert functions. Especially the type checks, I am missing these here. Like isFunction() and type().

I know I could switch to tap but unfortunately my IDE does not support other test frameworks except NodeUnit. Hence I'm stuck with it and hope you can integrate type checks?

Cheers
Michael

Start by reviewing NodeUnit's existing assertion functions and the assert module it is based on, then compare the requested isFunction() and type() checks with tap's equivalents. Done means the agreed type-check assertions are available through NodeUnit and covered by the project's relevant tests.

Written by the indexing model from the issue text.