introduce recipe_exception in result.proto

recipe_engine/step_runner.py

 # Copyright 2016 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 import calendar
 import collections
 import contextlib
 import datetime
 import itertools
 import json
@@ skipping 442 matching lines @@
     return ReturnOpenStep()
 
   def run_recipe(self, universe, recipe, properties):
     return self._test_data.depend_on_data.pop(types.freeze((recipe, properties),))
 
   @contextlib.contextmanager
   def run_context(self):
     try:
       yield
     except Exception as ex:
+      assert type(ex).__name__ != 'RecipeException'
       with self._test_data.should_raise_exception(ex) as should_raise:
         if should_raise:
           raise
 
     assert self._test_data.consumed, (
         "Unconsumed test data for steps: %s, (exception %s)" % (
             self._test_data.step_data.keys(),
             self._test_data.expected_exception))
 
   def _rendered_step_to_dict(self, rs):
@@ skipping 253 matching lines @@
   supplied command, and only uses the |env| kwarg for modifying the environment
   of the child process.
   """
   saved_path = os.environ['PATH']
   try:
     if path is not None:
       os.environ['PATH'] = path
     yield
   finally:
     os.environ['PATH'] = saved_path