Add DTLS handshake fragmentation test

For this test it is good to have a handshake messages length as big as
possible, so for the server the certificate verification mode is
changed from default NONE to REQUIRED. It requires the client to send
certificate date to the server during handshake

Signed-off-by: Piotr Nowicki <piotr.nowicki@arm.com>
diff --git a/tests/suites/test_suite_ssl.data b/tests/suites/test_suite_ssl.data
index 84d840c..39a9d54 100644
--- a/tests/suites/test_suite_ssl.data
+++ b/tests/suites/test_suite_ssl.data
@@ -277,6 +277,12 @@
 depends_on:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_SSL_PROTO_DTLS
 handshake_serialization
 
+DTLS Handshake fragmentation, MFL=512
+handshake_fragmentation:MBEDTLS_SSL_MAX_FRAG_LEN_512:1:1
+
+DTLS Handshake fragmentation, MFL=1024
+handshake_fragmentation:MBEDTLS_SSL_MAX_FRAG_LEN_1024:0:1
+
 Sending app data via TLS, MFL=512 without fragmentation
 depends_on:MBEDTLS_SSL_MAX_FRAGMENT_LENGTH
 app_data_tls:MBEDTLS_SSL_MAX_FRAG_LEN_512:400:512:1:1