Handle and surface application test failures.

mojo/tools/mopy/gtest_list_tests.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 re
+
+
 def gtest_list_tests(gtest_list_tests_output):
   """Returns a list of strings formatted as TestSuite.TestFixture from the
   output of running --gtest_list_tests on a GTEST application."""
 
+  if not re.match("^(\w*\.\r?\n(  \w*\r?\n)+)+", gtest_list_tests_output):
+    raise Exception("Unrecognized --gtest_list_tests output:\n%s" %
+                    gtest_list_tests_output)
+
   output_lines = gtest_list_tests_output.split('\n')
 
   test_list = []
   for line in output_lines:
     if not line:
       continue
     if line[0] != ' ':
       suite = line.strip()
       continue
     test_list.append(suite + line.strip())
 
   return test_list