diff --git a/application/src/Entity/Source/GroupSource.php b/application/src/Entity/Source/GroupSource.php
index 1096a83..6c60fef 100644
--- a/application/src/Entity/Source/GroupSource.php
+++ b/application/src/Entity/Source/GroupSource.php
@@ -5,6 +5,7 @@ use Doctrine\ORM\Mapping as ORM;
 use Doctrine\Common\Collections\Collection;
 use App\Entity\Source\Attribut\MembersAttributInterface;
 use App\Entity\Source\Attribut\MembersAttribut;
+use Doctrine\Common\Collections\ArrayCollection;
 
 /**
  *
@@ -22,5 +23,10 @@ final class GroupSource extends AbstractSource implements MembersAttributInterfa
      * @ORM\ManyToMany(targetEntity="AbstractSource")
      */
     protected $members;
+    
+    public function __construct() {
+        parent::__construct();
+        $this->members = new ArrayCollection();
+    }
 }
 
diff --git a/application/tests/unit/Entity/Source/GroupSourceTest.php b/application/tests/unit/Entity/Source/GroupSourceTest.php
new file mode 100644
index 0000000..0c695e1
--- /dev/null
+++ b/application/tests/unit/Entity/Source/GroupSourceTest.php
@@ -0,0 +1,35 @@
+<?php
+namespace tests\unit\Entity\Source;
+
+use App\Entity\Source\GroupSourceInterface;
+use App\Entity\Source\GroupSource;
+use PHPUnit\Framework\TestCase;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\Common\Collections\ArrayCollection;
+use App\Entity\Source\AbstractSource;
+
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+class GroupSourceTest extends TestCase
+{
+    /**
+     * 
+     * @var GroupSourceInterface
+     */
+    protected $groupSource;
+    
+    public function setUp():void {
+        $this->groupSource = new GroupSource();
+    }
+    
+    public function testMembers(){
+        $this->assertInstanceOf(Collection::class, $this->groupSource->getMembers());
+        $member = new class extends AbstractSource{};
+        $this->groupSource->setMembers(new ArrayCollection([$member]));
+        $this->assertEquals($member, $this->groupSource->getMembers()->get(0));
+    }
+}
+