Add pylint to depot_tools.

tests/presubmit_unittest.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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 presubmit_support.py and presubmit_canned_checks.py."""
 
 # pylint: disable=E1101,E1103
 
 import logging
 import os
 import StringIO
 import sys
 import time
 
-# TODO(maruel): Include inside depot_tools.
-from pylint import lint
-
-sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+sys.path.insert(0, _ROOT)
 
 from testing_support.super_mox import mox, SuperMoxTestBase
 
 import owners
 import presubmit_support as presubmit
 import rietveld
 
 # Shortcut.
 presubmit_canned_checks = presubmit.presubmit_canned_checks
 
@@ skipping 2099 matching lines @@
     input_api.subprocess.check_output(
         ['pyyyyython', '-m', 'test_module'], cwd=None, env=None,
         stderr=input_api.subprocess.STDOUT)
     self.mox.ReplayAll()
 
     results = presubmit_canned_checks.RunPythonUnitTests(
         input_api, presubmit.OutputApi, ['test_module'])
     self.assertEquals(len(results), 0)
 
   def testCannedRunPylint(self):
-    # lint.Run() always calls sys.exit()...
-    lint.Run = lambda x: sys.exit(0)
     input_api = self.MockInputApi(None, True)
+    input_api.environ = self.mox.CreateMock(os.environ)
+    input_api.environ.copy().AndReturn({})
     input_api.AffectedSourceFiles(mox.IgnoreArg()).AndReturn(True)
     input_api.PresubmitLocalPath().AndReturn('/foo')
     input_api.PresubmitLocalPath().AndReturn('/foo')
     input_api.os_walk('/foo').AndReturn([('/foo', [], ['file1.py'])])
+    pylint = os.path.join(_ROOT, 'third_party', 'pylint.py')
+    pylintrc = os.path.join(_ROOT, 'pylintrc')
+    input_api.subprocess.call(
+        ['pyyyyython', pylint, 'file1.py', '--rcfile=%s' % pylintrc])
     self.mox.ReplayAll()
 
     results = presubmit_canned_checks.RunPylint(
         input_api, presubmit.OutputApi)
     self.assertEquals([], results)
 
   def testCheckBuildbotPendingBuildsBad(self):
     input_api = self.MockInputApi(None, True)
     connection = self.mox.CreateMockAnything()
     input_api.urllib2.urlopen('uurl').AndReturn(connection)
@@ skipping 299 matching lines @@
         owners_check=False)
     self.assertEqual(1, len(results))
     self.assertEqual(
         'Found line ending with white spaces in:', results[0]._message)
     self.checkstdout('')
 
 
 if __name__ == '__main__':
   import unittest
   unittest.main()