CONFIG_FILE_SYSTEM=y CONFIG_LOG=y CONFIG_FAT_FILESYSTEM_ELM=y CONFIG_DISK_DRIVER_RAM=y CONFIG_DISK_RAM_VOLUME_SIZE=80 CONFIG_POSIX_API=y CONFIG_POSIX_FS=y CONFIG_ZTEST=y CONFIG_ZTEST_NEW_API=y CONFIG_MAIN_STACK_SIZE=4096