Use modern test macros for ease of debugging

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index 26988ce..727afee 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -704,21 +704,21 @@
     c = buf + sizeof(buf);
 
     ret = mbedtls_x509_string_to_names(&names, name);
-    TEST_ASSERT(ret == result);
+    TEST_EQUAL(ret, result);
 
     if (ret != 0) {
         goto exit;
     }
 
     ret = mbedtls_x509_write_names(&c, buf, names);
-    TEST_ASSERT(ret > 0);
+    TEST_LE_S(1, ret);
 
-    TEST_ASSERT(mbedtls_asn1_get_tag(&c, buf + sizeof(buf), &len,
-                                     MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE) == 0);
-    TEST_ASSERT(mbedtls_x509_get_name(&c, buf + sizeof(buf), &parsed) == 0);
+    TEST_EQUAL(mbedtls_asn1_get_tag(&c, buf + sizeof(buf), &len,
+                                     MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE), 0);
+    TEST_EQUAL(mbedtls_x509_get_name(&c, buf + sizeof(buf), &parsed), 0);
 
     ret = mbedtls_x509_dn_gets((char *) out, sizeof(out), &parsed);
-    TEST_ASSERT(ret > 0);
+    TEST_LE_S(1, ret);
 
     TEST_ASSERT(strcmp((char *) out, parsed_name) == 0);