Powering up UUT for the first time can be a risky business as there could be failures, such as shorts between supply lines, that could mean the UUT will never work or require significant expensive reworking. This is especially important when the UUT contains very expensive parts such as high end FPGA or micro processors.
A good test setup should have features to help the user protect the UUT from over-currents and over-voltages in a quick (micro seconds) and controlled manner.
Read more about the problem in the Technical Report <UUT Power up Safety>
Is your UUT protected and safe?
Testing UUT power supplies is often discarded as not required with the thought that 'if it works' the power must be ok. Nothing could be further from the truth as power supplies are often complex analogue circuits with multiple failure mechanisms.
Eiger Design has written a Technical Report explaining more and the risk involved when not properly testing the power supplies within a UUT.
Follow the link to find out more <UUT Power Testing>