[Checkins] [zopefoundation/transaction] e8f93f: try to increase test coverage

[Dieter Maurer]

  Branch: refs/heads/abort_hooks_#77
  Home:   https://github.com/zopefoundation/transaction
  Commit: e8f93fab3f8a8b7b3990a2286cb52a1c3451f975
      https://github.com/zopefoundation/transaction/commit/e8f93fab3f8a8b7b3990a2286cb52a1c3451f975
  Author: dieter <dieter at handshake.de>
  Date:   2019-06-19 (Wed, 19 Jun 2019)

  Changed paths:
    M transaction/_compat.py

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