Diagnostic program

A diagnostic program is a program written for the express purpose of examining the state, or locating problems with the hardware, or operating system environment that it is running on/in.A diagnostic program is a program written for the express purpose of locating problems with the software, hardware, or any combination there of in a system, or a network of systems. Preferably, diagnostic programs provide solutions to the user to solve issues.

A diagnostic program is a program written for the express purpose of locating problems with the software, hardware, or any combination there of in a system, or a network of systems. Preferably, diagnostic programs provide solutions to the user to solve issues.

Lego-like combination of testing features based on the specific requirements of a target environment:

In some cases hardware components have specific features to assist a diagnostic program to test it. For example, most modern hard drives have commands that provide information about some permanent error conditions. Also, some systems with ECC memory will log memory failures that were automatically corrected.

...
Wikipedia