esp-idf/components/newlib/test_apps/main/test_newlib_main.c

#include "unity.h"
#include "unity_fixture.h"

static void run_all_tests(void)
{
    RUN_TEST_GROUP(stdatomic);
}

void app_main(void)
{
    UNITY_MAIN_FUNC(run_all_tests);
}