SSL_pending
__owur int SSL_pending(const SSL *s);
ret = SSL_pending(ssl);
if (!TEST_int_eq(SSL_pending(cssl), 0)
if (!TEST_int_eq(SSL_pending(cssl), (int)sizeof(msg))
|| !TEST_int_eq(SSL_pending(clientquic), msglen - 1)
|| !TEST_int_eq(SSL_pending(clientquic), 0))
if (!TEST_int_eq(SSL_pending(clientssl), 0)
|| !TEST_int_eq(SSL_pending(serverssl), 0)
|| !TEST_int_eq(SSL_pending(clientssl), (int)(written - readbytes))