[Findit] don't included skipped or unknown tests in swarming tasks into failed tests.

appengine/findit/waterfall/test/swarming_tasks_to_try_job_pipeline_test.py

 # Copyright 2016 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 json
 
 from common.git_repository import GitRepository
 from common.pipeline_wrapper import pipeline_handlers
 from common.waterfall import buildbucket_client
 from model import result_status
@@ skipping 234 matching lines @@
     self.assertEqual(analysis.result_status,
                      result_status.FOUND_UNTRIAGED)
     self.assertEqual(analysis.suspected_cls,
                      [expected_suspected_cl])
 
   def testSuccessfullyScheduleNewTryJobForTest(self):
     master_name = 'm'
     builder_name = 'b'
     build_number = 1
     targeted_tests = {
-        'a_test': ['TestSuite1.test1', 'TestSuite1.test3'],
+        'a_test': ['TestSuite1.PRE_test1', 'TestSuite1.test3'],
         'b_test': [],  # Non-swarming test.
     }
 
     # Mocks for TriggerSwarmingTaskPipeline.
     def MockedDownloadSwarmingTaskData(*_):
       return [{'task_id': '1'}, {'task_id': '2'}]
     self.mock(swarming_util, 'ListSwarmingTasksDataByTags',
               MockedDownloadSwarmingTaskData)
 
     def MockedGetSwarmingTaskRequest(ref_task_id, *_):
@@ skipping 122 matching lines @@
                     }
                 }
             }
         }
     ]
 
     self.assertEqual(expected_try_job_results, try_job.test_results)
     self.assertEqual(analysis.result_status,
                      result_status.FOUND_UNTRIAGED)
     self.assertEqual(analysis.suspected_cls, [expected_suspected_cl])