[test] Make test runner more rubust on startup.

tools/testrunner/local/testsuite.py

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 307 matching lines @@
 
 
 class GoogleTestSuite(TestSuite):
   def __init__(self, name, root):
     super(GoogleTestSuite, self).__init__(name, root)
 
   def ListTests(self, context):
     shell = os.path.abspath(os.path.join(context.shell_dir, self.shell()))
     if utils.IsWindows():
       shell += ".exe"
-    output = commands.Execute(context.command_prefix +
-                              [shell, "--gtest_list_tests"] +
-                              context.extra_flags)
-    if output.exit_code != 0:
+
+    output = None
+    for i in xrange(3): # Try 3 times in case of errors.
+      output = commands.Execute(context.command_prefix +
+                                [shell, "--gtest_list_tests"] +
+                                context.extra_flags)
+      if output.exit_code == 0:
+        break
+      print "Test executable failed to list the tests (try %d).\n\nStdout:" % i
       print output.stdout
+      print "\nStderr:"
       print output.stderr
+      print "\nExit code: %d" % output.exit_code
+    else:
       raise Exception("Test executable failed to list the tests.")
+
     tests = []
     test_case = ''
     for line in output.stdout.splitlines():
       test_desc = line.strip().split()[0]
       if test_desc.endswith('.'):
         test_case = test_desc
       elif test_case and test_desc:
         test = testcase.TestCase(self, test_case + test_desc)
         tests.append(test)
     tests.sort(key=lambda t: t.path)
     return tests
 
   def GetFlagsForTestCase(self, testcase, context):
     return (testcase.flags + ["--gtest_filter=" + testcase.path] +
             ["--gtest_random_seed=%s" % context.random_seed] +
             ["--gtest_print_time=0"] +
             context.mode_flags)
 
   def _VariantGeneratorFactory(self):
     return StandardVariantGenerator
 
   def shell(self):
     return self.name