Issue 6945 - Add script to make filter list diffs

tests/test_differ.py

 # This file is part of Adblock Plus <https://adblockplus.org/>,
 # Copyright (C) 2006-present eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
 
+from __future__ import unicode_literals
 
 from abp.filters.renderer import render_diff
 
 BASE = '''[Adblock Plus 2.0]
 ! Version: 111
 ! diff-url: https://easylist-downloads.adblockplus.org/easylist/diffs/111.txt
 ! diff-expires: 1 hours
 ! Title: EasyList
 ! Expires: 1 days (update frequency)
 ! Homepage: https://easylist.to/
@@ skipping 20 matching lines @@
 ! Licence: https://easylist.to/pages/licence.html
 !
 ! Please report any unblocked adverts or problems
 ! in the forums (https://forums.lanik.us/)
 ! or via e-mail (easylist.subscription@gmail.com).
 !
 !-----------------------General advert blocking filters-----------------------!
 ! *** easylist:easylist/easylist_general_block.txt ***
 &act=ads_
 &ad_box_
-&ad_channel=
+&ad_channel=\U000000a3
  test
 '''
 
 
 EXPECTED = '''[Adblock Plus Diff]
 ! Diff-URL: https://easylist-downloads.adblockplus.org/easylist/diffs/123.txt
 ! Expires:
 ! Version: 123
 - &ad.vid=$~xmlhttprequest
-+ &ad_channel=
++ &ad_channel=\U000000a3
 '''
 
 
 def test_differ():
     exp = set(EXPECTED.splitlines())
     gen = set(render_diff(BASE.splitlines(), LATEST.splitlines()))
     assert(gen == exp)