Add automatic tests for Tick Processor, take two.

tools/test.py

Index: tools/test.py
diff --git a/tools/test.py b/tools/test.py
index f701ceb7784a2ece546631a58666ea10c01c2154..05eb9fdc006459ab487cf1a11d5df5d004b0a450 100755
--- a/tools/test.py
+++ b/tools/test.py
@@ -356,11 +356,15 @@ class TestCase(object):
   def RunCommand(self, command):
     full_command = self.context.processor(command)
     output = Execute(full_command, self.context, self.context.timeout)
+    self.Cleanup()
     return TestOutput(self, full_command, output)
 
   def Run(self):
     return self.RunCommand(self.GetCommand())
 
+  def Cleanup(self):
+    return
+
 
 class TestOutput(object):
 
@@ -473,6 +477,13 @@ def PrintError(str):
   sys.stderr.write('\n')
 
 
+def CheckedUnlink(name):
+  try:
+    os.unlink(name)
+  except OSError, e:
+    PrintError("os.unlink() " + str(e))
+
+
 def Execute(args, context, timeout=None):
   (fd_out, outname) = tempfile.mkstemp()
   (fd_err, errname) = tempfile.mkstemp()
@@ -487,11 +498,6 @@ def Execute(args, context, timeout=None):
   os.close(fd_err)
   output = file(outname).read()
   errors = file(errname).read()
-  def CheckedUnlink(name):
-    try:
-      os.unlink(name)
-    except OSError, e:
-      PrintError("os.unlink() " + str(e))
   CheckedUnlink(outname)
   CheckedUnlink(errname)
   return CommandOutput(exit_code, timed_out, output, errors)