III-1817 Make sure to check the arguments passed to the filter method…

… of the uitpas filter inside the unit test for adding and removing a label.

tests/ReadModel/RelationsToCdbXmlProjectorTest.php

@@ -24,6 +24,7 @@
 use CultuurNet\UDB3\Event\Events\EventCreated;
 use CultuurNet\UDB3\Event\EventType;
 use CultuurNet\UDB3\Label;
+use CultuurNet\UDB3\LabelCollection;
 use CultuurNet\UDB3\Location\Location;
 use CultuurNet\UDB3\Offer\IriOfferIdentifier;
 use CultuurNet\UDB3\Offer\IriOfferIdentifierFactoryInterface;
@@ -385,6 +386,7 @@ public function it_adds_label_to_all_related_events_when_organizer_has_uitpas_la
             );
 
         $this->uitpasLabelFilter->method('filter')
+            ->with(LabelCollection::fromStrings([$labelName]))
             ->willReturn([$labelName]);
 
         $this->uitpasLabelApplier->expects($this->once())
@@ -445,6 +447,7 @@ public function it_removes_label_from_all_related_events_when_organizer_has_uitp
             );
 
         $this->uitpasLabelFilter->method('filter')
+            ->with(LabelCollection::fromStrings([$labelName]))
             ->willReturn([$labelName]);
 
         $this->uitpasLabelApplier->expects($this->once())