D10119: baloo-widgets: Create test to assert metaDataRequestFinished is emitted once only

[Michael Heidelbach]

michaelh added a dependent revision: D10149: baloo-widgets: Add data test.

REPOSITORY
  R824 Baloo Widgets

REVISION DETAIL
  https://phabricator.kde.org/D10119

To: michaelh, elvisangelaccio, smithjd, vhanda, ngraham, #dolphin
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