default or selected kernelversion does not have config value CONFIG_CRC_KUNIT_TEST.
Result is shown for kernelversion 6.6.78

KUnit tests for CRC functions

modulename: crc_kunit.ko

configname: CONFIG_CRC_KUNIT_TEST

Linux Kernel Configuration
└─>Kernel hacking
└─>Kernel Testing and Coverage
└─>Runtime Testing
└─>KUnit - Enable support for unit tests
└─>KUnit tests for CRC functions
In linux kernel since version 6.6.78 (release Date: 2025-02-17)  
Unit tests for the CRC library functions.

This is intended to help people writing architecture-specific
optimized versions. If unsure, say N.

source code: