[Checkins] [zopefoundation/transaction] 3df691: try to increase test coverage

[Dieter Maurer]

  Branch: refs/heads/abort_hooks_#77
  Home:   https://github.com/zopefoundation/transaction
  Commit: 3df6914240ef950108ea9291b797cef8e77d5b9b
      https://github.com/zopefoundation/transaction/commit/3df6914240ef950108ea9291b797cef8e77d5b9b
  Author: dieter <dieter at handshake.de>
  Date:   2019-06-19 (Wed, 19 Jun 2019)

  Changed paths:
    M transaction/tests/test__transaction.py

  Log Message:
  -----------
  try to increase test coverage