In the presubmit for auto-bisect, run pylint and unit tests.

tools/auto_bisect/ttest_test.py

 # Copyright 2014 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.
 
 """Unit tests for ttest module."""
 
 import unittest
 
 import ttest
 
 
+# This test case accesses private functions of the ttest module.
+# pylint: disable=W0212
 class TTestTest(unittest.TestCase):
   """Tests for the t-test functions."""
 
   def testWelchsFormula(self):
     """Tests calculation of the t value."""
     # Results can be verified by directly plugging variables into Welch's
     # equation (e.g. using a calculator or the Python interpreter).
     self.assertEqual(
         -0.2796823595120407,
         ttest._TValue(0.299, 0.307, 0.05, 0.08, 150, 165))
@@ skipping 91 matching lines @@
     self.assertEqual(1, ttest._LookupPValue(0.0, 1))
     self.assertEqual(1, ttest._LookupPValue(0.0, 2))
 
   def testLookupLargeDF(self):
     """Tests a lookup when the given degrees of freedom is large."""
     self.assertEqual(0.02, ttest._LookupPValue(5.0, 50))
 
 
 if __name__ == '__main__':
   unittest.main()