failing textwrap test

[Jelmer Vernooij]

on travis/python3, textwrap tests fail with:

Traceback (most recent call last):
testtools.testresult.real._StringException: Empty attachments:
  log
Traceback (most recent call last):
  File "/opt/python/3.5.6/lib/python3.5/test/test_textwrap.py", line 629, in test_max_lines_long
    max_lines=4)
  File "/opt/python/3.5.6/lib/python3.5/test/test_textwrap.py", line 37, in check_wrap
    self.check(result, expect)
  File "/opt/python/3.5.6/lib/python3.5/test/test_textwrap.py", line 33, in check
    self.show(expect), self.show(result)))
  File "/home/travis/build/breezy-team/breezy/breezy/tests/__init__.py", line 1312, in assertEqual
    pprint.pformat(a), pprint.pformat(b)))
AssertionError: expected:
  0: 'Did you say '
  1: '"supercalifr'
  2: 'agilisticexp'
  3: '[...]'
but got:
  0: 'Did you say '
  1: '"supercalifr'
  2: 'agilisticexp'
  3: 'ialidocious?'
  4: '" How *do*'
  5: 'you spell'
  6: 'that odd'
  7: 'word,'
  8: 'anyways?'
not equal:
a = ['Did you say '
 '"supercalifr'
 'agilisticexp'
 'ialidocious?'
 '" How *do*'
 'you spell'
 'that odd'
 'word,'
 'anyways?']
b = ['Did you say ', '"supercalifr', 'agilisticexp', '[...]']