Improvements to the net/cert/internal error handling.

net/data/verify_certificate_chain_unittest/generate-intermediate-lacks-basic-constraints.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.
 
 """Certificate chain with 1 intermediate and a trusted root. The intermediate
 lacks the basic constraints extension, and hence is expected to fail validation
 (RFC 5280 requires v3 signing certificates have a BasicConstaints)."""
 
 import common
 
 # Self-signed root certificate (used as trust anchor).
 root = common.create_self_signed_root_certificate('Root')
 
 # Intermediate that lacks basic constraints.
 intermediate = common.create_intermediate_certificate('Intermediate', root)
 intermediate.get_extensions().remove_property('basicConstraints')
 
 # Target certificate.
 target = common.create_end_entity_certificate('Target', intermediate)
 
 chain = [target, intermediate]
 trusted = common.TrustAnchor(root, constrained=False)
 time = common.DEFAULT_TIME
 verify_result = False
-errors = """[Context] Processing Certificate
-  index: 0
-      [Error] Does not have Basic Constraints
+errors = """----- Certificate i=1 (CN=Intermediate) -----
+ERROR: Does not have Basic Constraints
+
 """
 
 common.write_test_file(__doc__, chain, trusted, time, verify_result, errors)