I have a 13" Late 2012 MacBook Pro which works fine. I am trying to run Hardware test following the instructions in the Apple Support document, How to use Apple Hardware Test on your Mac, but it is not working.
If I hold the D key while booting, it does not do anything. However, If I hold Option + D and then chose Wi-Fi connection in recovery mode, it shows the following error:
Error: 0x8000000000000003. Cannot Load 'EFI/Drivers/TestSupport.efi' Status: 0x00000003
There is installed macOS Mojave 10.14.4 over USB today.
Update: The question:
doesn't describe my situation, because in the mentioned case, Option + D works, and no error message is thrown.