introduce recipe_exception in result.proto

recipe_engine/unittests/run_test.py

Index: recipe_engine/unittests/run_test.py
diff --git a/recipe_engine/unittests/run_test.py b/recipe_engine/unittests/run_test.py
index 5e59495253504d49df0dec555bd55c3ab893d704..0ccc8bd53e48ec745a77d00704c2e592da85ed33 100755
--- a/recipe_engine/unittests/run_test.py
+++ b/recipe_engine/unittests/run_test.py
@@ -45,9 +45,11 @@ class RunTest(unittest.TestCase):
   def _test_recipe(self, recipe, properties=None):
     proc = subprocess.Popen(
         self._run_cmd(recipe, properties), stdout=subprocess.PIPE)
-    proc.communicate()
-    self.assertEqual(0, proc.returncode, '%d != %d when testing %s' % (
-        0, proc.returncode, recipe))
+    stdout, stderr = proc.communicate()
+    self.assertEqual(
+        0, proc.returncode,
+        ('%d != %d when testing %s\nstdout: %s\nstderr: %s' % (
+          0, proc.returncode, recipe, stdout, stderr)))
 
   def test_examples(self):
     tests = [
@@ -74,7 +76,6 @@ class RunTest(unittest.TestCase):
     # If this takes longer than 5 seconds to run, we consider it failed.
     self.assertLess(after - now, 5)
 
-
   def test_nonexistent_command(self):
     subp = subprocess.Popen(
         self._run_cmd('engine_tests/nonexistent_command'),