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

appengine/findit/waterfall/test/try_job_util_test.py

Index: appengine/findit/waterfall/test/try_job_util_test.py
diff --git a/appengine/findit/waterfall/test/try_job_util_test.py b/appengine/findit/waterfall/test/try_job_util_test.py
index 65f58afd018607153b19bd295ca23bac3e0c5073..706a8c82916c1adf8d83231a60258153893844ff 100644
--- a/appengine/findit/waterfall/test/try_job_util_test.py
+++ b/appengine/findit/waterfall/test/try_job_util_test.py
@@ -374,6 +374,21 @@ class TryJobUtilTest(wf_testcase.WaterfallTestCase):
     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'), [])