Roll version of gsutil to 4.15.

third_party/gsutil/gslib/tests/test_cat.py

 # -*- coding: utf-8 -*-
 # Copyright 2013 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
@@ skipping 30 matching lines @@
                             return_stderr=True, expected_status=1)
     self.assertIn('Invalid range', stderr)
 
     # Test various valid ranges.
     stdout = self.RunGsUtil(['cat', '-r 1-3', suri(key_uri)],
                             return_stdout=True)
     self.assertEqual('123', stdout)
     stdout = self.RunGsUtil(['cat', '-r 8-', suri(key_uri)],
                             return_stdout=True)
     self.assertEqual('89', stdout)
+    stdout = self.RunGsUtil(['cat', '-r 0-0', suri(key_uri)],
+                            return_stdout=True)
+    self.assertEqual('0', stdout)
     stdout = self.RunGsUtil(['cat', '-r -3', suri(key_uri)],
                             return_stdout=True)
     self.assertEqual('789', stdout)
 
   def test_cat_version(self):
     """Tests cat command on versioned objects."""
     bucket_uri = self.CreateVersionedBucket()
     # Create 2 versions of an object.
     uri1 = self.CreateObject(bucket_uri=bucket_uri, contents='data1')
     uri2 = self.CreateObject(bucket_uri=bucket_uri,
@@ skipping 40 matching lines @@
         return_stdout=True, return_stderr=True, expected_status=1)
 
     # If first object is invalid, exception should halt output immediately.
     self.assertNotIn(data1, stdout)
     self.assertIn('NotFoundException', stderr)
 
     # Two valid objects should both print successfully.
     stdout = self.RunGsUtil(['cat', suri(obj_uri1), suri(obj_uri2)],
                             return_stdout=True)
     self.assertIn(data1 + data2, stdout)