diff --git a/application/src/Entity/Meta/Relation.php b/application/src/Entity/Meta/Relation.php
index 9b882dd..9d50c31 100644
--- a/application/src/Entity/Meta/Relation.php
+++ b/application/src/Entity/Meta/Relation.php
@@ -14,8 +14,7 @@ use Doctrine\Common\Collections\Collection;
 
 /**
  * This class represents a relation.
- * It allows a better right management of the meta informations.
- * Also it is used to capsel the logic relation to an own logical unit.
+ * A relationship represents the creators and the created objects.
  *
  * @author kevinfrantz
  *
diff --git a/application/tests/Unit/Entity/Meta/RelationTest.php b/application/tests/Unit/Entity/Meta/RelationTest.php
new file mode 100644
index 0000000..f8d6508
--- /dev/null
+++ b/application/tests/Unit/Entity/Meta/RelationTest.php
@@ -0,0 +1,28 @@
+<?php
+namespace tests\Unit\Entity\Meta;
+
+use PHPUnit\Framework\TestCase;
+use App\Entity\Meta\RelationInterface;
+use App\Entity\Meta\Relation;
+use Doctrine\Common\Collections\Collection;
+
+class RelationTest extends TestCase
+{
+    /**
+     * 
+     * @var RelationInterface
+     */
+    protected $relation;
+    
+    public function setUp():void{
+        $this->relation = new Relation();
+    }
+    
+    public function testConstructor():void {
+        $this->assertInstanceOf(Collection::class, $this->relation->getChilds());
+        $this->assertInstanceOf(Collection::class, $this->relation->getParents());
+        $this->expectException(\TypeError::class);
+        $this->relation->getSource();
+    }
+}
+