V8: Reduce test expectations by whitelisting

scripts/slave/recipes/v8.py

 # Copyright 2013 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.
 
+from recipe_engine.post_process import Filter
+
 DEPS = [
   'archive',
   'chromium',
   'depot_tools/gclient',
   'recipe_engine/json',
   'recipe_engine/path',
   'recipe_engine/platform',
   'recipe_engine/properties',
   'recipe_engine/raw_io',
   'recipe_engine/step',
@@ skipping 99 matching lines @@
     ) +
     api.step_data('bot_update', retcode=1)
   )
 
   yield (
     api.v8.test(
         'client.v8',
         'V8 Linux',
         'swarming_collect_failure',
     ) +
-    api.step_data('Check', retcode=1)
+    api.step_data('Check', retcode=1) +
+    api.post_process(Filter('Check')) +
+    api.post_process(Filter('Test262')) +
+    api.post_process(Filter('$result'))

[iannucci1, 2016/11/01 20:21:51]

Hm... I would expect this to remove all of the steps from your expectation.
You're telling it:
  * Remove all the steps except 'Check'
  * THEN Remove all the steps except 'Test262'
  * THEN Remove all the steps except '$result'

Maybe you want `Filter('Check', 'Test262', '$result')`?

I'm surprised that it's not completely removing this expectation file, though.
I'll look into that.

[Michael Achenbach, 2016/11/01 20:25:20]

Ah, yes you're right! Will change that.

   )
 
   # Simulate a tryjob triggered by the CQ for setting up different swarming
   # default tags.
   yield (
     api.v8.test(
         'tryserver.v8',
         'v8_linux_rel_ng_triggered',
         'triggered_by_cq',
         requester='commit-bot@chromium.org',
@@ skipping 268 matching lines @@
     ) +
     api.override_step_data(
         'generate_build_files', api.raw_io.stream_output(
             'Writing """\\\n'
             'goma_dir = "/b/build/slave/cache/cipd/goma"\n'
             'target_cpu = "x64"\n'
             'use_goma = true\n'
             '""" to /path/to/args.gn.\n'
             'moar\n'))
   )