test_revspec_tag_all fails on windows

Quoting John A Meinel from https://code.launchpad.net/~gagern/bzr/bug560030-include-bash-completion-plugin/+merge/23912

..._completion.tests.test_bashcomp.TestBashCompletionInvoking.test_revspec_tag_all FAIL 3407ms
    Text attachment: log
------------
15.616 creating repository in file:///C:/users/jameinel/appdata/local/temp/testbzr-06_rhc.tmp/.bzr/.
15.632 creating branch <bzrlib.branch.BzrBranchFormat7 object at 0x01FA9110> in file:///C:/users/jameinel/appdata/local/temp/testbzr-06_rhc.tmp/
15.725 opening working tree 'C:/users/jameinel/appdata/local/temp/testbzr-06_rhc.tmp'
15.999 creating repository in file:///C:/users/jameinel/appdata/local/temp/testbzr-06_rhc.tmp/nInvoking.test_revspec_tag_all/work/.bzr/.
16.180 creating branch <bzrlib.branch.BzrBranchFormat6 object at 0x033F5E50> in file:///C:/users/jameinel/appdata/local/temp/testbzr-06_rhc.tmp/nInvoking.test_revspec_tag_all/work/
16.292 opening working tree 'C:/users/jameinel/appdata/local/temp/testbzr-06_rhc.tmp/nInvoking.test_revspec_tag_all/work'
------------
Text attachment: traceback
------------
Traceback (most recent call last):
  File "c:\Python26\lib\site-packages\testtools-0.9.2-py2.6.egg\testtools\runtest.py", line 128, in _run_user
    return fn(*args)
  File "c:\Python26\lib\site-packages\testtools-0.9.2-py2.6.egg\testtools\testcase.py", line 368, in _run_test_method
    testMethod()
  File "C:\Users\jameinel\dev\bzr\jam-integration\bzrlib\plugins\bash_completion\tests\test_bashcomp.py", line 197, in test_revspec_tag_all
    self.assertCompletionEquals('tag1', 'tag2', '3tag')
  File "C:\Users\jameinel\dev\bzr\jam-integration\bzrlib\plugins\bash_completion\tests\test_bashcomp.py", line 97, in assertCompletionEquals
    self.assertEqual(set(words), self.completion_result)
AssertionError: not equal:
a = set(['3tag', 'tag1', 'tag2'])
b = set()