diff --git a/tests/suites/test_suite_x509write.data b/tests/suites/test_suite_x509write.data
index f755565eca..37679c1539 100644
--- a/tests/suites/test_suite_x509write.data
+++ b/tests/suites/test_suite_x509write.data
@@ -226,5 +226,14 @@ mbedtls_x509_string_to_names:"C=NL, O=Of\\CCspark, OU=PolarSSL":"C=NL, O=Of\\CCs
 X509 String to Names #20 (Reject empty AttributeValue)
 mbedtls_x509_string_to_names:"C=NL, O=, OU=PolarSSL":"":MBEDTLS_ERR_X509_INVALID_NAME
 
+X509 Round trip test (Escaped characters)
+mbedtls_x509_string_to_names:"CN=Lu\\C4\\8Di\\C4\\87, O=Offspark, OU=PolarSSL":"CN=Lu\\C4\\8Di\\C4\\87, O=Offspark, OU=PolarSSL":0
+
+X509 Round trip test (hexstring output for non string input)
+mbedtls_x509_string_to_names:"C=NL, 2.5.4.10=#03084F6666737061726B, OU=PolarSSL":"C=NL, O=#03084F6666737061726B, OU=PolarSSL":0
+
+X509 Round trip test (numercoid hexstring output for unknown OID)
+mbedtls_x509_string_to_names:"C=NL, 2.5.4.10.234.532=#0C084F6666737061726B, OU=PolarSSL":"C=NL, 2.5.4.10.234.532=#0C084F6666737061726B, OU=PolarSSL":0
+
 Check max serial length
 x509_set_serial_check: