KUnit test for rational.c

modulename: rational-test.ko

configname: CONFIG_RATIONAL_KUNIT_TEST

Linux Kernel Configuration
└─>Kernel hacking
└─>Kernel Testing and Coverage
└─>Runtime Testing
└─>KUnit - Enable support for unit tests
└─>KUnit test for rational.c
In linux kernel since version 5.2 (release Date: 2019-07-07)  
This builds the rational math unit test.
For more information on KUnit and unit tests in general please refer
to the KUnit documentation in
source code: