Update tests, fix namespace

tests/Unit/ActivityPub/NoteAttachmentTest.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Tests\Unit;
+namespace Tests\Unit\ActivityPub;
 
 use App\Util\ActivityPub\Helpers;
 use Tests\TestCase;

tests/Unit/ActivityPub/RemoteFollowTest.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Tests\Unit;
+namespace Tests\Unit\ActivityPub;
 
 use App\Util\ActivityPub\Helpers;
 use Tests\TestCase;