[Culprit-finder] Refactor findit testcase and move it to libs.

appengine/findit/model/flake/test/flake_analysis_request_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.
 
 from datetime import datetime
 import mock
 
-from common.findit_testcase import FinditTestCase
+from libs.testcase import TestCase
 from model.flake.flake_analysis_request import BuildStep
 from model.flake.flake_analysis_request import FlakeAnalysisRequest
 from model.flake.master_flake_analysis import MasterFlakeAnalysis
 
 
-class FlakeAnalysisRequestTest(FinditTestCase):
+class FlakeAnalysisRequestTest(TestCase):
 
   def testStripMasterPrefix(self):
     cases = {
         'master.tryserver.chromium.linux': 'tryserver.chromium.linux',
         'chromium.linux': 'chromium.linux',
     }
     for original_name, expected_name in cases.iteritems():
       self.assertEqual(expected_name,
                        BuildStep._StripMasterPrefix(original_name))
 
@@ skipping 102 matching lines @@
   def testFindMatchingAnalysisForConfiguration(self, _):
     request = FlakeAnalysisRequest.Create('test', False, 123)
     analysis = MasterFlakeAnalysis.Create('m', 'b', 123, 's', 'test')
     analysis.Save()
     request.analyses.append(analysis.key)
     request.Save()
 
     self.assertEqual(
         analysis,
         request.FindMatchingAnalysisForConfiguration('m', 'b'))