Various minor improvements to recipe_simulation_test.py.

scripts/slave/unittests/expect_tests/type_definitions.py

 # Copyright 2014 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.
 
 import os
 
 from collections import namedtuple
 
 UnknownError = namedtuple('UnknownError', 'message')
 TestError = namedtuple('TestError', 'test message')
+NoMatchingTestsError = namedtuple('NoMatchingTestsError', '')
 Result = namedtuple('Result', 'data')
 
 class ResultStageAbort(Exception):
   pass
 
 
 class Failure(object):
   pass
 
 
@@ skipping 141 matching lines @@
     def __call__(self, obj):
       """Called to handle each object in the ResultStage
 
       @type obj: Anything passed to put_result in GenStage or RunStage.
 
       @return: If the handler method returns Failure(), then it will
                cause the entire test run to ultimately return an error code.
       """
       return getattr(self, 'handle_' + type(obj).__name__, self.__unknown)(obj)
 
+    def handle_NoMatchingTestsError(self, _error):
+      print 'No tests found that match the glob: %s' % (
+          ' '.join(self.opts.test_glob),)
+      return Failure()
+
     def __unknown(self, obj):
       if self.opts.verbose:
         print 'UNHANDLED:', obj
       return Failure()
 
     def finalize(self, aborted):
       """Called after __call__() has been called for all results.
 
       @param aborted: True if the user aborted the run.
       @type aborted: bool
       """
       pass