WARNING: There is a danger of "blowing up" every part you try to test if a voltage source is put into current mode without getting set back into voltage mode before the end of the test. This happens because when a voltage source is in current mode and if there is no load, then the supply gets railed either + or -. So when the next part is placed in the socket, it gets smoked because the testexec does not reset things into voltage mode between tests.