Test drivers

configname: CONFIG_MEDIA_TEST_SUPPORT

Linux Kernel Configuration
└─>Device Drivers
└─>Multimedia support
└─>Media device types
└─>Test drivers
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
These drivers should not be used on production kernels, but
can be useful on debug ones. This option enables several dummy drivers
that simulate real hardware. Very useful to test userspace
applications and to validate if the subsystem core doesn't
have regressions.

Say Y if you want to use some virtual test driver.

In case of doubts, say N.
Say Y when you have a software defined radio device.