Open nios.xcodeproj with your XCode and just Run
Tests are not available (yet).
The objective is to run any (or most) node.js apps on any iOS device with no (or very few) modifications.
Nios sends messages from javascript to objective-c (and vice versa) using WebViewJavascriptBridge for asyncronic methods, and syncronic XML HTTP Requests when the result is immediatly needed. All modules and libraries written for node.js in C++ needs to be ported.