Inheritance / inclusion in JS files

In your module, you haven't exported anything - so the result of including it will be an empty object. Do:

var wifi = require( "Wifi" );
function MoqBase(){};
MoqBase.prototype.ssid;
MoqBase.prototype.startPairing = function () {...}
exports = MoqBase;

And then you should be off to a better start. However first, I'd make life simple for yourself by trying it all in one file.