Code review comment for lp:~mbp/bzr/test-errors

failed again with

bzr: ERROR: exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 34: ordinal not in range(128)

Traceback (most recent call last):
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/commands.py", line 918, in exception_to_return_code
   return the_callable(*args, **kwargs)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/commands.py", line 1118, in run_bzr
   ret = run(*run_argv)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/commands.py", line 676, in run_argv_aliases
   return self.run(**all_cmd_args)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/commands.py", line 698, in run
   return self._operation.run_simple(*args, **kwargs)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/cleanup.py", line 135, in run_simple
   self.cleanups, self.func, *args, **kwargs)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/cleanup.py", line 165, in _do_with_cleanups
   result = func(*args, **kwargs)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/builtins.py", line 3836, in run
   result = tests.selftest(**selftest_kwargs)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/tests/__init__.py", line 3735, in selftest
   result_decorators=result_decorators,
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/tests/__init__.py", line 3243, in run_suite
   result = runner.run(suite)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/tests/__init__.py", line 4477, in run
   test.run(result)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/tests/__init__.py", line 3357, in run
   return super(CountingDecorator, self).run(result)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/tests/__init__.py", line 3346, in run
   test.run(result)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/tests/TestUtil.py", line 89, in run
   tests.pop().run(result)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/tests/TestUtil.py", line 89, in run
   tests.pop().run(result)
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/tests/TestUtil.py", line 89, in run
   tests.pop().run(result)
 File "/usr/lib/python2.6/dist-packages/testtools/testcase.py", line 420, in run
   return self.__RunTest(self, self.exception_handlers).run(result)
 File "/usr/lib/python2.6/dist-packages/testtools/runtest.py", line 67, in run
   return self._run_one(actual_result)
 File "/usr/lib/python2.6/dist-packages/testtools/runtest.py", line 81, in _run_one
   return self._run_prepared_result(ExtendedToOriginalDecorator(result))
 File "/usr/lib/python2.6/dist-packages/testtools/runtest.py", line 100, in _run_prepared_result
   handler(self.case, self.result, e)
 File "/usr/lib/python2.6/dist-packages/testtools/testcase.py", line 388, in _report_error
   result.addError(self, details=self.getDetails())
 File "/usr/lib/python2.6/dist-packages/testtools/testresult/real.py", line 399, in addError
   return self.decorated.addError(test, details=details)
 File "/usr/lib/python2.6/dist-packages/subunit/test_results.py", line 118, in addError
   return self.super.addError(test, err, details=details)
 File "/usr/lib/python2.6/dist-packages/subunit/test_results.py", line 56, in addError
   return self.decorated.addError(test, err, details=details)
 File "/usr/lib/python2.6/dist-packages/testtools/testresult/real.py", line 399, in addError
   return self.decorated.addError(test, details=details)
 File "/usr/lib/python2.6/dist-packages/subunit/__init__.py", line 568, in addError
   self._addOutcome("error", test, error=error, details=details)
 File "/usr/lib/python2.6/dist-packages/subunit/__init__.py", line 625, in _addOutcome
   self._write_details(details)
 File "/usr/lib/python2.6/dist-packages/subunit/__init__.py", line 702, in _write_details
   encoder.close()
 File "/usr/lib/python2.6/dist-packages/subunit/chunked.py", line 163, in close
   self.flush()
 File "/usr/lib/python2.6/dist-packages/subunit/chunked.py", line 148, in flush
   self.output.write(''.join(buffered_bytes))
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/ui/text.py", line 540, in write
   self.wrapped_stream.write(to_write)
 File "/usr/lib/python2.6/codecs.py", line 351, in write
   data, consumed = self.encode(object, self.errors)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 34: ordinal not in range(128)