[geary] (6 commits) ...Merge branch 'wip/794174-conversation-monitor-max-cpu'. Fixes Bug 794174.

[Michael Gratton <mjog src gnome org>]

Summary of changes:

  50f73ff... Allow test fixtures and test methods to throw errors by def (*)
  15748ce... Tidy up unit test infrastructure and mock classes. (*)
  7120880... Add a mock object mixin that can check call expectations on (*)
  0ea1fe6... Don't use the database for internal ConversationMonitor boo (*)
  3bf2ac1... Add unit tests for ConversationMonitor, fix a few issues. (*)
  2149f74... Merge branch 'wip/794174-conversation-monitor-max-cpu'. Fix

(*) This commit already existed in another branch; no separate mail sent