Hello all, has anybody who has worked in circuit design and testing know what thermal, vibration and shock and EMC testing involves?

 

Yes it involves spending lots of $$$$ money.
The standard to which you are designing this circuit will include all the information you need to know.
Your question is quite broad. Do you have a more detailed question..

Obviously thermal involves attaching thermocouples or other temp measurement devices and then running the product at its max, waiting for thermal stability then recording the results and verifying that the recorded temps do not exceed any ratings for the components being tested..

Vibration puts the product on a vib table or rack and runs a vibration profile to see if the product is harmed in any way..
Shock = expose product to specified shock..

emc/emi puts the product in a large chamber and exposes it to frequencies to see if they disturb the product or examines any "signals" your device is putting out looking to see if it is above a threshold.

 

Nice one, you pretty much answered my question.