[Maniphest] [Updated] T1809: Load a specific plugin in the unit tests

[elvisangelaccio (Elvis Angelaccio)]

elvisangelaccio added a revision: D1131: Introduce another overload of Archive::create().

TASK DETAIL
  https://phabricator.kde.org/T1809

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To: elvisangelaccio
Cc: kde-utils-devel, elvisangelaccio, tctara