get_native_path_case() now preserves the trailing os.sep.path and work with non-existing path.

tools/isolate/run_test_from_archive_smoke_test.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.
 
 import hashlib
 import json
 import logging
 import os
 import shutil
@@ skipping 86 matching lines @@
     }
     result_file = os.path.join(self.tempdir, 'foo.results')
     write_json(result_file, result_data)
 
     cmd = [
       sys.executable, os.path.join(ROOT_DIR, 'run_test_from_archive.py'),
       '--manifest', result_file,
       '--cache', self.cache,
       '--remote', self.table,
     ]
-    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    proc = subprocess.Popen(
+        cmd,
+        stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+        universal_newlines=True)
     out, err = proc.communicate()
     self.assertEquals(1070, len(out))
     self.assertEquals('', err)
     self.assertEquals(6, proc.returncode)
 
   def test_hash(self):
     # Loads the manifest from the store as a hash, then run the child.
     # Store the executable in the hash table.
     shutil.copyfile(self.test, os.path.join(self.table, self.test_sha1))
     # Store a .results file in the hash table. The file name is the content's
     # sha1, so first generate the content.
     result_data = {
       'files': {
         'gtest_fake.py': {
           'sha-1': self.test_sha1,
         },
       },
       'command': ['python', 'gtest_fake.py'],
     }
     result_sha1 = self._store_result(result_data)
 
     cmd = [
       sys.executable, os.path.join(ROOT_DIR, 'run_test_from_archive.py'),
       '--hash', result_sha1,
       '--cache', self.cache,
       '--remote', self.table,
     ]
-    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    proc = subprocess.Popen(
+        cmd,
+        stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+        universal_newlines=True)
     out, err = proc.communicate()
     self.assertEquals(1070, len(out))
     self.assertEquals('', err)
     self.assertEquals(6, proc.returncode)
 
   def test_fail_empty_manifest(self):
     result_sha1 = self._store_result({})
     cmd = [
       sys.executable, os.path.join(ROOT_DIR, 'run_test_from_archive.py'),
       '--hash', result_sha1,
       '--cache', self.cache,
       '--remote', self.table,
     ]
-    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    proc = subprocess.Popen(
+        cmd,
+        stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+        universal_newlines=True)
     out, err = proc.communicate()
     self.assertEquals('', out)
     self.assertEquals('No file to map\n', err)
     self.assertEquals(1, proc.returncode)
 
 
 if __name__ == '__main__':
   VERBOSE = '-v' in sys.argv
   logging.basicConfig(level=logging.DEBUG if VERBOSE else logging.ERROR)
   unittest.main()