[Findit] Extract failed output nodes from stdio log of compile step.

appengine/findit/waterfall/test/try_job_util_test.py

 # Copyright 2015 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 common.waterfall import failure_type
 from model import analysis_status
 from model.wf_try_job import WfTryJob
 from waterfall import try_job_util
 from waterfall.test import wf_testcase
 from waterfall.try_job_type import TryJobType
@@ skipping 356 matching lines @@
         'SwarmingTasksToTryJobPipeline', _MockRootPipeline)
     _MockRootPipeline.STARTED = False
 
     try_job_util.ScheduleTryJobIfNeeded(failure_info, None, None)
 
     try_job = WfTryJob.Get(master_name, builder_name, build_number)
 
     self.assertTrue(_MockRootPipeline.STARTED)
     self.assertIsNotNone(try_job)
 
+  def testUseFailedOutputNodesFromSignals(self):
+    signals = {
+        'compile': {
+            'failed_targets': [
+                {'target': 'a.exe'},
+                {'source': 'b.cc', 'target': 'b.o'},
+            ],
+            'failed_output_nodes': ['a', 'b'],
+        }
+    }
+
+    self.assertEqual(
+        try_job_util._GetFailedTargetsFromSignals(signals, 'm', 'b'),
+        ['a', 'b'])
+
   def testGetFailedTargetsFromSignals(self):
     self.assertEqual(
         try_job_util._GetFailedTargetsFromSignals({}, 'm', 'b'), [])
 
     self.assertEqual(
         try_job_util._GetFailedTargetsFromSignals({'compile': {}}, 'm', 'b'),
         [])
 
     signals = {
         'compile': {
@@ skipping 38 matching lines @@
             {
                 'step_name': 'steps'
             },
         ]
     }
     expected_suspected_revisions = ['r1', 'r2']
     self.assertEqual(
         expected_suspected_revisions,
         try_job_util._GetSuspectsForCompileFailureFromHeuristicResult(
             heuristic_result))