default or selected kernelversion does not have config value CONFIG_STRSCPY_KUNIT_TEST.
Result is shown for kernelversion 6.9.9

Test strscpy*() family of functions at runtime

modulename: strscpy_kunit.ko

configname: CONFIG_STRSCPY_KUNIT_TEST

Linux Kernel Configuration
└─>Kernel hacking
└─>Kernel Testing and Coverage
└─>Runtime Testing
└─>KUnit - Enable support for unit tests
└─>Test strscpy*() family of functions at runtime
In linux kernel since version 6.2 (release Date: 2023-02-19)  
source code: