Refactor how net/data/verify_certificate_chain_unittest/*

net/data/verify_certificate_chain_unittest/generate-violates-pathlen-1-constrained-root.py

-#!/usr/bin/python
-# Copyright (c) 2016 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 2 intermediates and one end entity certificate. The
-root certificate has a pathlen:1 restriction, and constraints are enforced
-on this trust anchor making it an invalid chain."""
-
-import common
-
-# Self-signed root certificate (used as trust anchor).
-root = common.create_self_signed_root_certificate('Root')
-root.get_extensions().set_property('basicConstraints',
-                                   'critical,CA:true,pathlen:1')
-
-# Intermediate 1 (no pathlen restriction).
-intermediate1 = common.create_intermediate_certificate('Intermediate1', root)
-
-# Intermediate 2 (no pathlen restriction).
-intermediate2 = common.create_intermediate_certificate('Intermediate2',
-                                                       intermediate1)
-
-# Target certificate.
-target = common.create_end_entity_certificate('Target', intermediate2)
-
-chain = [target, intermediate2, intermediate1]
-trusted = common.TrustAnchor(root, constrained=True)
-time = common.DEFAULT_TIME
-key_purpose = common.DEFAULT_KEY_PURPOSE
-verify_result = False
-errors = """----- Certificate i=1 (CN=Intermediate2) -----
-ERROR: max_path_length reached
-
-"""
-
-common.write_test_file(__doc__, chain, trusted, time, key_purpose,
-                       verify_result, errors)