1. In an information handling system in which an application program runs on an operating system having a signature verification function for verifying a digital signature of the application program, a method for program verification comprising the steps of: having the signature verification function of the operating system verify the digital signature of the application program and, responsive to verification of the digital signature of the application program, initiate execution of the application program; and having the application program, responsive to initiation of execution thereof, test the signature verification function of the operating system by generating a test digital signature and presenting the test digital signature to the signature verification function for verification.