Set selftest verbose flag to boost coverage

tests/suites/test_suite_x509parse.function

diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index c476ec5..2affab7 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -623,6 +623,6 @@
 /* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_SELF_TEST */
 void x509_selftest()
 {
-    TEST_ASSERT( mbedtls_x509_self_test( 0 ) == 0 );
+    TEST_ASSERT( mbedtls_x509_self_test( 1 ) == 0 );
 }
 /* END_CASE */