Add accessor for timing final delay

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index 67f4d6e..bda2a96 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -5277,3 +5277,14 @@
     mbedtls_ssl_config_free( &conf );
 }
 /* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_TIMING_C:MBEDTLS_HAVE_TIME */
+void timing_accessor( )
+{
+    mbedtls_timing_delay_context    delay_context;
+
+    mbedtls_timing_set_delay( &delay_context, 50, 100 );
+
+    TEST_ASSERT( mbedtls_timing_get_final_delay( &delay_context ) == 100 );
+}
+/* END_CASE */