default or selected kernelversion does not have config value CONFIG_CRC16_KUNIT_TEST.
Result is shown for kernelversion 6.6.75

KUnit tests for CRC16

modulename: crc16_kunit.ko

configname: CONFIG_CRC16_KUNIT_TEST

Linux Kernel Configuration
└─>Kernel hacking
└─>Kernel Testing and Coverage
└─>Runtime Testing
└─>KUnit - Enable support for unit tests
└─>KUnit tests for CRC16
In linux kernel since version 6.13 (release Date: 2025-01-19)  
Enable this option to run unit tests for the kernel's CRC16
implementation (<linux/crc16.h>).

source code: