Add tests for keyUsage to the built-in cert verifier.

net/data/verify_certificate_chain_unittest/rebase-errors.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.
 
 """Helper script to update the test error expectations based on actual results.
 
 This is useful for regenerating test expectations after making changes to the
 error format.
 
@@ skipping 89 matching lines @@
 
   # Update the file.
   write_string_to_file(contents, path)
 
 
 def fixup_py_file(path, actual_errors):
   """Replaces the 'errors = XXX' section of the test's python script"""
   contents = read_file_to_string(path)
 
   # This assumes that the errors variable uses triple quotes.
-  prog = re.compile(r'^errors = """(.*?)"""', re.MULTILINE | re.DOTALL)
+  prog = re.compile(r'^errors = (""".*?"""|None)', re.MULTILINE | re.DOTALL)
   result = prog.search(contents)
 
   # Replace the stuff in between the triple quotes with the actual errors.
   contents = replace_string(contents, result.start(1), result.end(1),
-                            actual_errors)
+                            '"""' + actual_errors + '"""')
 
   # Update the file.
   write_string_to_file(contents, path)
 
 
 def get_src_root():
   """Returns the path to the enclosing //src directory. This assumes the
   current script is inside the source tree."""
   cur_dir = os.path.dirname(os.path.realpath(__file__))
 
@@ skipping 42 matching lines @@
 
   for m in failed_test_regex.finditer(test_stdout):
     actual_errors = m.group(1)
     actual_errors = actual_errors.decode('string-escape')
     relative_test_path = m.group(2)
     fixup_errors_for_file(actual_errors, get_abs_path(relative_test_path))
 
 
 if __name__ == "__main__":
   main()