STACK_OF_X509_cmp
int ret = TEST_int_eq(STACK_OF_X509_cmp(fixture->caPubs, caPubs), 0);
ret = TEST_int_eq(0, STACK_OF_X509_cmp(chain, fixture->chain));
ret = TEST_int_eq(0, STACK_OF_X509_cmp(chain, fixture->chain));
if (!TEST_int_eq(0, STACK_OF_X509_cmp(sk, fixture->chain)))
int STACK_OF_X509_cmp(const STACK_OF(X509) *sk1, const STACK_OF(X509) *sk2);