D19683: autotests: use new signal failedToLoad in ProviderTest

[David Faure]

dfaure created this revision.
dfaure added a reviewer: leinir.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
dfaure requested review of this revision.

REVISION SUMMARY
  This is an attempt to improve error handling to fix CI failures

TEST PLAN
  Running the test, but it was already passing here

REPOSITORY
  R235 Attica

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D19683

AFFECTED FILES
  autotests/providertest.cpp

To: dfaure, leinir
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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