I am in the process of building my first ever project and wondered if there was any way to test the connections and outputs before finalising it all? I am a little concerned about the continuity of some of the wires. 
Check this article:
Thanks.
Is there also a way to connect the Arduino to a PC and check that all the sensor and motors are all being detected and are functioning okay?
I guess I can connect each device one at a time and run a sketch to simply see if it operates and work from there.