When no feedbacks are available (either because the requested event does
not exist in the theme or because the system does not have required
capabilities, e.g. no vibration motor or LED) feedbackd will emit a
"feedback-ended" signal (with reason LFB_EVENT_STATE_REASON_NOT_FOUND)
on DBus _before_ completing the event triggering DBus call.
Since the DBus call was not completed yet, LfbEvent will not have
learned it's ID yet and therefore not emit it's own "feedback-ended"
GObject signal.
In this case the test will timeout since the main loop is never quit.
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