D19292: collectionattributetest: small cleanups

[David Faure]

dfaure created this revision.
dfaure added a reviewer: dvratil.
dfaure requested review of this revision.

REVISION SUMMARY
  - Don't fail with "duplicate collection" errors after a failure in one
  
  of the tests, properly cleanup
  
  - Avoid "no such collection" warning due to knut modifying the
  
  collection after we deleted it
  
  - Fix typo in method name

TEST PLAN
  test still passes

BRANCH
  Applications/18.12

REVISION DETAIL
  https://phabricator.kde.org/D19292

AFFECTED FILES
  autotests/libs/collectionattributetest.cpp
  autotests/libs/collectionattributetest.h

To: dfaure, dvratil
Cc: kde-pim
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