Introduce CertErrors::ToDebugString().

net/data/verify_certificate_chain_unittest/common.py

 #!/usr/bin/python
 # Copyright (c) 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Set of helpers to generate signed X.509v3 certificates.
 
 This works by shelling out calls to the 'openssl req' and 'openssl ca'
 commands, and passing the appropriate command line flags and configuration file
 (.cnf).
@@ skipping 435 matching lines @@
   # Write the certificate chain to the output file.
   for cert in chain:
     test_data += '\n' + cert.get_cert_pem()
 
   test_data += '\n' + trust_anchor.get_pem()
   test_data += '\n' + text_data_to_pem('TIME', utc_time)
 
   verify_result_string = 'SUCCESS' if verify_result else 'FAIL'
   test_data += '\n' + text_data_to_pem('VERIFY_RESULT', verify_result_string)
 
+  # TODO(eroman): Make the consumer pass errors as a string.
   if errors is not None:
     test_data += '\n' + text_data_to_pem('ERRORS', '\n'.join(errors))
 
   write_string_to_file(test_data, out_pem if out_pem else g_out_pem)
 
 
 def write_string_to_file(data, path):
   with open(path, 'w') as f:
     f.write(data)
 
@@ skipping 30 matching lines @@
 
 
 def create_intermediate_certificate(name, issuer):
   return Certificate(name, TYPE_CA, issuer)
 
 
 def create_end_entity_certificate(name, issuer):
   return Certificate(name, TYPE_END_ENTITY, issuer)
 
 init(sys.argv[0])