CONFIG_S390_MODULES_SANITY_TEST_HELPERS is not available for thedefaultarchitecture x86.
Result is shown for architecture s390

CONFIG_S390_MODULES_SANITY_TEST_HELPERS (not configurable)

modulename: test_modules_helpers.ko

configname: CONFIG_S390_MODULES_SANITY_TEST_HELPERS

Linux Kernel Configuration
└─>S390_MODULES_SANITY_TEST_HELPERS
In linux kernel since version 5.2 (release Date: 2019-07-07)  
source code:
arch/s390/lib/test_modules_helpers.c