ssl_helpers.c: Add ticket write/parse test functions

Add ticket write/parse test functions as defined
by mbedtls_ssl_ticket_write/parse_t. They are
intended to be used in negative testing
involving tickets.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tests/include/test/ssl_helpers.h b/tests/include/test/ssl_helpers.h
index d03c624..1f41966 100644
--- a/tests/include/test/ssl_helpers.h
+++ b/tests/include/test/ssl_helpers.h
@@ -589,6 +589,16 @@
     int *expected_result, mbedtls_ssl_chk_buf_ptr_args *args);
 #endif /* MBEDTLS_TEST_HOOKS */
 
+#if defined(MBEDTLS_SSL_SESSION_TICKETS)
+int mbedtls_test_ticket_write(
+    void *p_ticket, const mbedtls_ssl_session *session,
+    unsigned char *start, const unsigned char *end,
+    size_t *tlen, uint32_t *ticket_lifetime);
+
+int mbedtls_test_ticket_parse(void *p_ticket, mbedtls_ssl_session *session,
+                              unsigned char *buf, size_t len);
+#endif /* MBEDTLS_SSL_SESSION_TICKETS */
+
 #define ECJPAKE_TEST_PWD        "bla"
 
 #if defined(MBEDTLS_USE_PSA_CRYPTO)