diff --git a/application/src/Entity/Source/Collection/TreeCollectionSource.php b/application/src/Entity/Source/Collection/TreeCollectionSource.php
index e98397d..96d455f 100644
--- a/application/src/Entity/Source/Collection/TreeCollectionSource.php
+++ b/application/src/Entity/Source/Collection/TreeCollectionSource.php
@@ -13,7 +13,7 @@ use App\Entity\Method\CollectionDimensionHelperMethod;
  * @ORM\Table(name="source_group")
  * @ORM\Entity
  */
-final class TreeCollectionSource extends AbstractCollectionSource implements TreeCollectionSourceInterface
+class TreeCollectionSource extends AbstractCollectionSource implements TreeCollectionSourceInterface
 {
     use MembersAttribut;
     use CollectionDimensionHelperMethod;
diff --git a/application/src/Entity/Source/Data/UserSource.php b/application/src/Entity/Source/Data/UserSource.php
index e961041..9185c89 100644
--- a/application/src/Entity/Source/Data/UserSource.php
+++ b/application/src/Entity/Source/Data/UserSource.php
@@ -13,7 +13,7 @@ use App\Entity\UserInterface;
  * @ORM\Table(name="source_data_user")
  * @ORM\Entity(repositoryClass="App\Repository\UserSourceRepository")
  */
-final class UserSource extends AbstractDataSource implements UserSourceInterface
+class UserSource extends AbstractDataSource implements UserSourceInterface
 {
     use UserAttribut,NameSourceAttribut;
 
diff --git a/application/tests/Unit/Entity/Meta/RecieverTest.php b/application/tests/Unit/Entity/Meta/RecieverTest.php
index db99af0..2e4b0f2 100644
--- a/application/tests/Unit/Entity/Meta/RecieverTest.php
+++ b/application/tests/Unit/Entity/Meta/RecieverTest.php
@@ -6,6 +6,10 @@ use PHPUnit\Framework\TestCase;
 use App\Entity\Meta\Reciever;
 use App\Entity\Meta\RecieverInterface;
 use Doctrine\Common\Collections\Collection;
+use App\Entity\Source\Data\UserSource;
+use App\Entity\Source\Collection\TreeCollectionSource;
+use App\Entity\Source\Collection\TreeCollectionSourceInterface;
+use App\Entity\Source\Data\UserSourceInterface;
 
 class RecieverTest extends TestCase
 {
@@ -25,4 +29,38 @@ class RecieverTest extends TestCase
         $this->expectException(\TypeError::class);
         $this->reciever->getRight();
     }
+
+    public function testMembersIncludingChildren(): void
+    {
+        /**
+         * @var \PHPUnit\Framework\MockObject\MockObject|UserSourceInterface
+         */
+        $user1 = $this->createMock(UserSource::class);
+        /**
+         * @var \PHPUnit\Framework\MockObject\MockObject|UserSourceInterface
+         */
+        $user2 = $this->createMock(UserSource::class);
+        /**
+         * @var \PHPUnit\Framework\MockObject\MockObject|UserSourceInterface
+         */
+        $user3 = $this->createMock(UserSource::class);
+        /**
+         * @var \PHPUnit\Framework\MockObject\MockObject|TreeCollectionSourceInterface
+         */
+        $group1 = $this->createMock(TreeCollectionSource::class);
+        /**
+         * @var \PHPUnit\Framework\MockObject\MockObject|TreeCollectionSourceInterface
+         */
+        $group2 = $this->createMock(TreeCollectionSource::class);
+        /**
+         * @var \PHPUnit\Framework\MockObject\MockObject|TreeCollectionSourceInterface
+         */
+        $group3 = $this->createMock(TreeCollectionSource::class);
+        $group1->getCollection()->add($user1);
+        $group2->getCollection()->add($group1);
+        $group2->getCollection()->add($user2);
+        $group2->getCollection()->add($user3);
+        $group3->getCollection()->add($group2);
+        $this->assertEquals(6, $this->reciever->getMembersIncludingChildren()->count());
+    }
 }
diff --git a/application/tests/Unit/Entity/Meta/RightTest.php b/application/tests/Unit/Entity/Meta/RightTest.php
index 9206a64..40b4ab9 100644
--- a/application/tests/Unit/Entity/Meta/RightTest.php
+++ b/application/tests/Unit/Entity/Meta/RightTest.php
@@ -27,7 +27,7 @@ class RightTest extends TestCase
 
     public function testConstructor(): void
     {
-        $this->assertEquals($this->right,$this->right->getReciever()->getRight());
+        $this->assertEquals($this->right, $this->right->getReciever()->getRight());
         $this->expectException(\TypeError::class);
         $this->assertNull($this->right->getLaw());
         $this->expectException(\TypeError::class);