Add more test coverage to push-to-trunk script.

tools/push-to-trunk/push_to_trunk.py

 #!/usr/bin/env python
 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
@@ skipping 203 matching lines @@
 
 
 class CommitRepository(Step):
   def __init__(self):
     Step.__init__(self, "Commit to the repository.")
 
   def RunStep(self):
     self.WaitForLGTM()
     # Re-read the ChangeLog entry (to pick up possible changes).
     # FIXME(machenbach): This was hanging once with a broken pipe.
-    TextToFile(Command("cat %s | awk --posix '{\
-        if ($0 ~ /^[0-9]{4}-[0-9]{2}-[0-9]{2}:/) {\
-          if (in_firstblock == 1) {\
-            exit 0;\
-          } else {\
-            in_firstblock = 1;\
-          }\
-        };\
-        print $0;\
-      }'" % self.Config(CHANGELOG_FILE)), self.Config(CHANGELOG_ENTRY_FILE))
+    TextToFile(GetLastChangeLogEntries(self.Config(CHANGELOG_FILE)),
+               self.Config(CHANGELOG_ENTRY_FILE))
 
-    if self.Git("cl dcommit", "PRESUBMIT_TREE_CHECK=\"skip\"") is None:
+    if self.Git("cl dcommit -v", "PRESUBMIT_TREE_CHECK=\"skip\"") is None:
       self.Die("'git cl dcommit' failed, please try again.")
 
 
 class StragglerCommits(Step):
   def __init__(self):
     Step.__init__(self, "Fetch straggler commits that sneaked in since this "
                         "script was started.")
 
   def RunStep(self):
     if self.Git("svn fetch") is None:
@@ skipping 337 matching lines @@
 def Main():
   parser = BuildOptions()
   (options, args) = parser.parse_args()
   if not ProcessOptions(options):
     parser.print_help()
     return 1
   RunScript(CONFIG, options)
 
 if __name__ == "__main__":
   sys.exit(Main())