Add ssl-opt.sh tests for ssl_client/server TLS 1.3 kex parameters

Those tests are so far only checking that ssl_client2/ssl_server2
recognize the arguments, nothing more.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 01265ae..56c4a5f 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -1453,6 +1453,40 @@
             "$P_CLI key_file=data_files/cli-rsa.key crt_file=data_files/cli-rsa-sha256.crt" \
             0
 
+# Dummy TLS 1.3 test
+# Currently only checking that passing TLS 1.3 key exchange modes to
+# ssl_client2/ssl_server2 example programs works.
+requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL
+run_test    "TLS 1.3, key exchange mode parameter passing: PSK only" \
+            "$P_SRV tls13_kex_modes=psk_pure" \
+            "$P_CLI tls13_kex_modes=psk_pure" \
+            0
+requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL
+run_test    "TLS 1.3, key exchange mode parameter passing: PSK-ephemeral only" \
+            "$P_SRV tls13_kex_modes=psk_ephemeral" \
+            "$P_CLI tls13_kex_modes=psk_ephemeral" \
+            0
+requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL
+run_test    "TLS 1.3, key exchange mode parameter passing: Pure-ephemeral only" \
+            "$P_SRV tls13_kex_modes=ephemeral_pure" \
+            "$P_CLI tls13_kex_modes=ephemeral_pure" \
+            0
+requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL
+run_test    "TLS 1.3, key exchange mode parameter passing: All ephemeral" \
+            "$P_SRV tls13_kex_modes=ephemeral_all" \
+            "$P_CLI tls13_kex_modes=ephemeral_all" \
+            0
+requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL
+run_test    "TLS 1.3, key exchange mode parameter passing: All PSK" \
+            "$P_SRV tls13_kex_modes=psk_all" \
+            "$P_CLI tls13_kex_modes=psk_all" \
+            0
+requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL
+run_test    "TLS 1.3, key exchange mode parameter passing: All" \
+            "$P_SRV tls13_kex_modes=all" \
+            "$P_CLI tls13_kex_modes=all" \
+            0
+
 # Tests for datagram packing
 run_test    "DTLS: multiple records in same datagram, client and server" \
             "$P_SRV dtls=1 dgram_packing=1 debug_level=2" \