Yes, it is always good to have spare hardware for testing.
I bought a lighted keyboard from monoprice because my husband and I are in our 70's and black keyboards don't work well for us. I have lots of spare keyboards but his computer uses a USB keyboard and my spares are PS/2.
I attached it to his computer and discovered that I couldn't get into the BIOS.
I had a bright yellow keyboard with large black letters I bought as a spare USB keyboard. I attached that to my husband's computer and was able to get into the BIOS. Since I rarely enter the BIOS, it took awhile to discover that glitch on the more expensive lighted keyboard.