diff --git a/application/src/Entity/Attribut/MembersAttribut.php b/application/src/Entity/Attribut/MembersAttribut.php
index 3c3529f..5172ffd 100644
--- a/application/src/Entity/Attribut/MembersAttribut.php
+++ b/application/src/Entity/Attribut/MembersAttribut.php
@@ -3,8 +3,7 @@
 namespace App\Entity\Attribut;
 
 use Doctrine\Common\Collections\Collection;
-use Doctrine\Common\Collections\ArrayCollection;
-use App\Helper\Dimension;
+use App\Helper\DimensionHelper;
 
 /**
  * @author kevinfrantz
@@ -34,8 +33,9 @@ trait MembersAttribut
      */
     public function getMembersIncludingChildren(?int $dimension = null, Collection $members = null): Collection
     {
-        $dimensionHelper = new Dimension(__FUNCTION__, MembersAttributInterface::class, $this, 'members');
-        return $dimensionHelper->getDimensions($dimension,$members);
+        $dimensionHelper = new DimensionHelper(__FUNCTION__, MembersAttributInterface::class, $this, 'members');
+
+        return $dimensionHelper->getDimensions($dimension, $members);
     }
 
     private function continueIncludeMembersLoop(?int $dimension): bool
diff --git a/application/src/Entity/Attribut/MembershipsAttribut.php b/application/src/Entity/Attribut/MembershipsAttribut.php
index f91dced..89173eb 100644
--- a/application/src/Entity/Attribut/MembershipsAttribut.php
+++ b/application/src/Entity/Attribut/MembershipsAttribut.php
@@ -3,7 +3,6 @@
 namespace App\Entity\Attribut;
 
 use Doctrine\Common\Collections\Collection;
-use App\Entity\Source\GroupSourceInterface;
 use App\Entity\Source\Collection\MemberCollectionSourceInterface;
 
 /**
diff --git a/application/src/Entity/Attribut/SourceCollectionAttribut.php b/application/src/Entity/Attribut/SourceCollectionAttribut.php
index d7c2035..35d1789 100644
--- a/application/src/Entity/Attribut/SourceCollectionAttribut.php
+++ b/application/src/Entity/Attribut/SourceCollectionAttribut.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace App\Entity\Attribut;
 
 use Doctrine\Common\Collections\Collection;
@@ -9,15 +10,14 @@ trait SourceCollectionAttribut
     /**
      * @param Collection|SourceInterface[] $collection
      */
-    public function setCollection(Collection $collection):void{
-        
+    public function setCollection(Collection $collection): void
+    {
     }
-    
+
     /**
      * @return Collection|SourceInterface[]
      */
-    public function getCollection():Collection{
-        
+    public function getCollection(): Collection
+    {
     }
 }
-
diff --git a/application/src/Entity/Attribut/SourceCollectionAttributInterface.php b/application/src/Entity/Attribut/SourceCollectionAttributInterface.php
index 6dcc8e3..4bb229d 100644
--- a/application/src/Entity/Attribut/SourceCollectionAttributInterface.php
+++ b/application/src/Entity/Attribut/SourceCollectionAttributInterface.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace App\Entity\Attribut;
 
 use Doctrine\Common\Collections\Collection;
@@ -9,10 +10,10 @@ interface SourceCollectionAttributInterface
     /**
      * @param Collection|SourceInterface[] $collection
      */
-    public function setCollection(Collection $collection):void;
-    
+    public function setCollection(Collection $collection): void;
+
     /**
      * @return Collection|SourceInterface[]
      */
-    public function getCollection():Collection;
-}
\ No newline at end of file
+    public function getCollection(): Collection;
+}
diff --git a/application/src/Entity/Source/AbstractSource.php b/application/src/Entity/Source/AbstractSource.php
index e5b36d0..490879c 100644
--- a/application/src/Entity/Source/AbstractSource.php
+++ b/application/src/Entity/Source/AbstractSource.php
@@ -6,7 +6,6 @@ use Doctrine\ORM\Mapping as ORM;
 use JMS\Serializer\Annotation\Exclude;
 use App\Entity\AbstractEntity;
 use Doctrine\Common\Collections\Collection;
-use App\Entity\Attribut\GroupSourcesAttribut;
 use App\Entity\Meta\RelationInterface;
 use App\Entity\Attribut\RelationAttribut;
 use App\Entity\Meta\Relation;
diff --git a/application/src/Entity/Source/Collection/AbstractCollectionSource.php b/application/src/Entity/Source/Collection/AbstractCollectionSource.php
index d314ed2..fd08cab 100644
--- a/application/src/Entity/Source/Collection/AbstractCollectionSource.php
+++ b/application/src/Entity/Source/Collection/AbstractCollectionSource.php
@@ -1,9 +1,14 @@
 <?php
+
 namespace App\Entity\Source\Collection;
 
 use App\Entity\Source\AbstractSource;
 
+/**
+ * @todo Implement inhiering classes!
+ * @author kevinfrantz
+ *
+ */
 class AbstractCollectionSource extends AbstractSource implements CollectionSourceInterface
 {
 }
-
diff --git a/application/src/Entity/Source/Collection/CollectionSourceInterface.php b/application/src/Entity/Source/Collection/CollectionSourceInterface.php
index c83520b..6c05555 100644
--- a/application/src/Entity/Source/Collection/CollectionSourceInterface.php
+++ b/application/src/Entity/Source/Collection/CollectionSourceInterface.php
@@ -1,8 +1,9 @@
 <?php
+
 namespace App\Entity\Source\Collection;
 
 use App\Entity\Source\SourceInterface;
 
 interface CollectionSourceInterface extends SourceInterface
-{}
-
+{
+}
diff --git a/application/src/Entity/Source/Collection/MemberCollectionSource.php b/application/src/Entity/Source/Collection/MemberCollectionSource.php
index 0012ebf..5f6d5ca 100644
--- a/application/src/Entity/Source/Collection/MemberCollectionSource.php
+++ b/application/src/Entity/Source/Collection/MemberCollectionSource.php
@@ -6,6 +6,7 @@ use Doctrine\ORM\Mapping as ORM;
 use Doctrine\Common\Collections\Collection;
 use App\Entity\Attribut\MembersAttribut;
 use Doctrine\Common\Collections\ArrayCollection;
+
 /**
  * @author kevinfrantz
  * @ORM\Table(name="source_group")
diff --git a/application/src/Entity/Source/Collection/MemberCollectionSourceInterface.php b/application/src/Entity/Source/Collection/MemberCollectionSourceInterface.php
index 148a687..97aef1c 100644
--- a/application/src/Entity/Source/Collection/MemberCollectionSourceInterface.php
+++ b/application/src/Entity/Source/Collection/MemberCollectionSourceInterface.php
@@ -7,6 +7,6 @@ use App\Entity\Attribut\MembersAttributInterface;
 /**
  * @author kevinfrantz
  */
-interface MemberCollectionSourceInterface extends MembersAttributInterface,CollectionSourceInterface
+interface MemberCollectionSourceInterface extends MembersAttributInterface, CollectionSourceInterface
 {
-}
\ No newline at end of file
+}
diff --git a/application/src/Entity/Source/Collection/Queue/QueueSourceInterface.php b/application/src/Entity/Source/Collection/Queue/QueueSourceInterface.php
index 792ae92..8dc11b7 100644
--- a/application/src/Entity/Source/Collection/Queue/QueueSourceInterface.php
+++ b/application/src/Entity/Source/Collection/Queue/QueueSourceInterface.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace App\Entity\Source\Collection\Queue;
 
 use App\Entity\Attribut\MembersAttributInterface;
@@ -7,11 +8,12 @@ use App\Entity\Source\SourceInterface;
 
 /**
  * @todo Implement integration test for two user accessing queue! Check if log works!
+ *
  * @author kevinfrantz
  */
 interface QueueSourceInterface extends CollectionSourceInterface, MembersAttributInterface
 {
-    public function getPointerPosition():int;
-    
-    public function getNextElement():SourceInterface;
-}
\ No newline at end of file
+    public function getPointerPosition(): int;
+
+    public function getNextElement(): SourceInterface;
+}
diff --git a/application/src/Helper/Dimension.php b/application/src/Helper/DimensionHelper.php
similarity index 64%
rename from application/src/Helper/Dimension.php
rename to application/src/Helper/DimensionHelper.php
index e76d3fc..5bb81bc 100644
--- a/application/src/Helper/Dimension.php
+++ b/application/src/Helper/DimensionHelper.php
@@ -1,60 +1,61 @@
 <?php
+
 namespace App\Helper;
 
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 
 /**
- * Helps to get all Elements till a special dimension
+ * Helps to get all Elements till a special dimension.
+ *
  * @author kevinfrantz
  *
+ * @todo Implement tests for all functions
  */
-final class Dimension implements DimensionInterface
+final class DimensionHelper implements DimensionHelperInterface
 {
     /**
-     *
      * @var string
      */
     private $attribut;
-    
+
     /**
      * @var string
      */
     private $method;
-    
+
     /**
-     * 
      * @var string
      */
     private $interface;
-    
+
     /**
-     * 
      * @var object
      */
     private $object;
-    
+
     /**
      * @var int|null the actual dimension to which the class points
      */
     private $dimension = null;
-    
+
     /**
-     * @param string $method which uses the dimension helper
+     * @param string $method    which uses the dimension helper
      * @param string $interface which is implemented in all classes which have dimensions
-     * @param object $object which calls the dimension helper
-     * @param string $attribut which represents dimensions
+     * @param object $object    which calls the dimension helper
+     * @param string $attribut  which represents dimensions
      */
-    public function __construct(string $method,string $interface, object $object,string $attribut) {
-       $this->method = $method;
-       $this->interface = $interface;
-       $this->object = $object;
-       $this->attribut = $attribut;
+    public function __construct(string $method, string $interface, object $object, string $attribut)
+    {
+        $this->method = $method;
+        $this->interface = $interface;
+        $this->object = $object;
+        $this->attribut = $attribut;
     }
-    
+
     /**
      * @param int        $dimension The dimensions start with 1 for the elements of the actuall dimension and NULL for all elements
-     * @param Collection $elements   A  elements collection, to which new elements should be add
+     * @param Collection $elements  A  elements collection, to which new elements should be add
      *
      * @return Collection Returns all elements till the defined dimension
      */
@@ -62,7 +63,7 @@ final class Dimension implements DimensionInterface
     {
         $this->setDimension($dimension);
         $elements = $elements ?? new ArrayCollection();
-        foreach ($this->object->{$this->attributGetterName()}()->toArray() as $element) { 
+        foreach ($this->object->{$this->attributGetterName()}()->toArray() as $element) {
             if (!$elements->contains($element)) {
                 $elements->add($element);
                 if ($this->continueLoop() && $element instanceof $this->interface) {
@@ -70,28 +71,32 @@ final class Dimension implements DimensionInterface
                 }
             }
         }
+
         return $elements;
     }
-    
-    private function setDimension(?int $dimension):void{
+
+    private function setDimension(?int $dimension): void
+    {
         $this->dimension = is_int($dimension) ? $dimension - 1 : null;
     }
-    
-    private function attributGetterName():string{
+
+    private function attributGetterName(): string
+    {
         return 'get'.ucfirst($this->attribut);
     }
-    
-    private function includeInfiniteDimensions():bool{
+
+    private function includeInfiniteDimensions(): bool
+    {
         return is_null($this->dimension);
     }
-    
-    private function isNotLastDimension():bool{
+
+    private function isNotLastDimension(): bool
+    {
         return $this->dimension > 0;
     }
-    
+
     private function continueLoop(): bool
     {
-        return $this->includeInfiniteDimensions() || $this->isNotLastDimension(); 
+        return $this->includeInfiniteDimensions() || $this->isNotLastDimension();
     }
 }
-
diff --git a/application/src/Helper/DimensionInterface.php b/application/src/Helper/DimensionHelperInterface.php
similarity index 83%
rename from application/src/Helper/DimensionInterface.php
rename to application/src/Helper/DimensionHelperInterface.php
index cefa3eb..807c872 100644
--- a/application/src/Helper/DimensionInterface.php
+++ b/application/src/Helper/DimensionHelperInterface.php
@@ -1,10 +1,10 @@
 <?php
+
 namespace App\Helper;
 
 use Doctrine\Common\Collections\Collection;
 
-interface DimensionInterface
+interface DimensionHelperInterface
 {
     public function getDimensions(?int $dimension = null, Collection $elements = null): Collection;
 }
-
diff --git a/application/tests/AbstractTestCase.php b/application/tests/AbstractTestCase.php
index da20b2a..8818dcf 100644
--- a/application/tests/AbstractTestCase.php
+++ b/application/tests/AbstractTestCase.php
@@ -17,12 +17,30 @@ abstract class AbstractTestCase extends TestCase
      *
      * @return mixed method return
      */
-    public function invokeMethod(&$object, $methodName, array $parameters = [])
+    public function invokeMethod(object &$object, string $methodName, array $parameters = [])
     {
-        $reflection = new \ReflectionClass(get_class($object));
+        $reflection = $this->getReflectionClassByObject($object);
         $method = $reflection->getMethod($methodName);
         $method->setAccessible(true);
 
         return $method->invokeArgs($object, $parameters);
     }
+
+    /**
+     * @param object $object
+     * @param string $property
+     * @param mixed  $value
+     */
+    public function setProperty(object &$object, string $property, $value): void
+    {
+        $reflectionClass = $this->getReflectionClassByObject($object);
+        $reflectionProperty = $reflectionClass->getProperty($property);
+        $reflectionProperty->setAccessible(true);
+        $reflectionProperty->setValue($object, $value);
+    }
+
+    private function getReflectionClassByObject(object &$object): \ReflectionClass
+    {
+        return new \ReflectionClass(get_class($object));
+    }
 }
diff --git a/application/tests/Unit/Entity/Attribut/IdAttributTest.php b/application/tests/Unit/Entity/Attribut/IdAttributTest.php
index f1ac8d6..69709aa 100644
--- a/application/tests/Unit/Entity/Attribut/IdAttributTest.php
+++ b/application/tests/Unit/Entity/Attribut/IdAttributTest.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace Tests\Unit\Entity\Attribut;
 
 use PHPUnit\Framework\TestCase;
@@ -8,27 +9,27 @@ use App\Entity\Attribut\IdAttributInterface;
 class IdAttributTest extends TestCase
 {
     /**
-     * 
      * @var IdAttributInterface
      */
     protected $id;
-    
-    public function setUp():void{
-        $this->id = new class implements IdAttributInterface{
+
+    public function setUp(): void
+    {
+        $this->id = new class() implements IdAttributInterface {
             use IdAttribut;
         };
     }
-    
-    public function testConstruct():void{
+
+    public function testConstruct(): void
+    {
         $this->expectException(\TypeError::class);
         $this->id->getId();
     }
-    
-    public function testAccessors():void{
+
+    public function testAccessors(): void
+    {
         $id = 1234;
         $this->assertNull($this->id->setId($id));
         $this->assertEquals($id, $this->id->getId());
     }
-    
 }
-
diff --git a/application/tests/Unit/Entity/Attribut/MembersAttributTest.php b/application/tests/Unit/Entity/Attribut/MembersAttributTest.php
index 0882909..3a4956b 100644
--- a/application/tests/Unit/Entity/Attribut/MembersAttributTest.php
+++ b/application/tests/Unit/Entity/Attribut/MembersAttributTest.php
@@ -5,7 +5,6 @@ namespace App\Tests\Unit\Entity\Attribut;
 use App\Entity\Attribut\MembersAttribut;
 use App\Entity\Attribut\MembersAttributInterface;
 use Doctrine\Common\Collections\ArrayCollection;
-use App\Entity\Source\AbstractSource;
 use App\Tests\AbstractTestCase;
 use App\Entity\Source\SourceInterface;
 
@@ -20,9 +19,10 @@ class MembersAttributTest extends AbstractTestCase
     {
         $this->membersAttribut = $this->getMembersAttributClassMock();
     }
-    
-    private function getMembersAttributClassMock():MembersAttributInterface{
-        return new class implements MembersAttributInterface{
+
+    private function getMembersAttributClassMock(): MembersAttributInterface
+    {
+        return new class() implements MembersAttributInterface {
             use MembersAttribut;
         };
     }
@@ -34,20 +34,6 @@ class MembersAttributTest extends AbstractTestCase
         $this->membersAttribut->getMembersIncludingChildren();
     }
 
-    private function getContinueIncludeMemberLoopResult($dimension): bool
-    {
-        return $this->invokeMethod($this->membersAttribut, 'continueIncludeMembersLoop', [$dimension]);
-    }
-
-    public function testContinueIncludeMemberLoop()
-    {
-        $this->assertTrue($this->getContinueIncludeMemberLoopResult(null));
-        $this->assertTrue($this->getContinueIncludeMemberLoopResult(2));
-        $this->assertTrue($this->getContinueIncludeMemberLoopResult(1));
-        $this->assertFalse($this->getContinueIncludeMemberLoopResult(0));
-        $this->assertFalse($this->getContinueIncludeMemberLoopResult(-1));
-    }
-
     public function testMembersAccessors()
     {
         $source1 = $this->createMock(SourceInterface::class);
diff --git a/application/tests/Unit/Entity/Attribut/MembershipsAttributTest.php b/application/tests/Unit/Entity/Attribut/MembershipsAttributTest.php
index c0d2c92..09d0270 100644
--- a/application/tests/Unit/Entity/Attribut/MembershipsAttributTest.php
+++ b/application/tests/Unit/Entity/Attribut/MembershipsAttributTest.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace Tests\Unit\Entity\Attribut;
 
 use PHPUnit\Framework\TestCase;
@@ -10,26 +11,27 @@ use Doctrine\Common\Collections\ArrayCollection;
 class MembershipsAttributTest extends TestCase
 {
     /**
-     * 
      * @var MembershipsAttributInterface
      */
     protected $memberships;
-    
-    public function setUp():void{
-        $this->memberships = new class implements MembershipsAttributInterface{
+
+    public function setUp(): void
+    {
+        $this->memberships = new class() implements MembershipsAttributInterface {
             use MembershipsAttribut;
         };
     }
-    
-    public function testConstructor():void {
+
+    public function testConstructor(): void
+    {
         $this->expectException(\TypeError::class);
         $this->memberships->getMemberships();
     }
-    
-    public function testAccessors():void {
+
+    public function testAccessors(): void
+    {
         $membership = $this->createMock(MemberCollectionSourceInterface::class);
         $this->assertNull($this->memberships->setMemberships(new ArrayCollection([$membership])));
         $this->assertEquals($this->memberships->getMemberships()->get(0), $membership);
     }
 }
-
diff --git a/application/tests/Unit/Entity/Source/AbstractSourceTest.php b/application/tests/Unit/Entity/Source/AbstractSourceTest.php
index 6c95669..24d2299 100644
--- a/application/tests/Unit/Entity/Source/AbstractSourceTest.php
+++ b/application/tests/Unit/Entity/Source/AbstractSourceTest.php
@@ -33,4 +33,4 @@ class AbstractSourceTest extends TestCase
         $this->assertInstanceOf(Collection::class, $this->source->getMemberships());
         $this->assertInstanceOf(LawInterface::class, $this->source->getLaw());
     }
-}
\ No newline at end of file
+}
diff --git a/application/tests/Unit/Entity/Source/Collection/MemberCollectionSourceTest.php b/application/tests/Unit/Entity/Source/Collection/MemberCollectionSourceTest.php
index fe567ae..7453f8b 100644
--- a/application/tests/Unit/Entity/Source/Collection/MemberCollectionSourceTest.php
+++ b/application/tests/Unit/Entity/Source/Collection/MemberCollectionSourceTest.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace Tests\Unit\Entity\Source\Collection;
 
 use PHPUnit\Framework\TestCase;
@@ -9,14 +10,11 @@ use App\Entity\Source\Collection\MemberCollectionSourceInterface;
 use App\Entity\Source\Collection\MemberCollectionSource;
 
 /**
- *
  * @author kevinfrantz
  */
 class MemberCollectionSourceTest extends TestCase
 {
-
     /**
-     *
      * @var MemberCollectionSourceInterface
      */
     protected $groupSource;
@@ -33,9 +31,10 @@ class MemberCollectionSourceTest extends TestCase
 
     public function testMembers()
     {
-        $member = new class() extends AbstractSource {};
+        $member = new class() extends AbstractSource {
+        };
         $this->groupSource->setMembers(new ArrayCollection([
-            $member
+            $member,
         ]));
         $this->assertEquals($member, $this->groupSource->getMembers()
             ->get(0));
diff --git a/application/tests/Unit/HelperTest.php b/application/tests/Unit/HelperTest.php
new file mode 100644
index 0000000..4b3f0d7
--- /dev/null
+++ b/application/tests/Unit/HelperTest.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace App\Tests\Unit\Helper;
+
+use App\Tests\AbstractTestCase;
+use App\Helper\DimensionHelper;
+use App\Helper\DimensionHelperInterface;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\Common\Collections\ArrayCollection;
+
+class HelperTest extends AbstractTestCase
+{
+    /**
+     * @var DimensionHelperInterface
+     */
+    protected $dimensionMock;
+
+    public function setUp(): void
+    {
+        $this->dimensionMock = new class() implements DimensionHelperInterface {
+            /**
+             * @var ArrayCollection
+             */
+            public $dimensionElements;
+
+            /**
+             * @var DimensionHelper
+             */
+            public $dimensionHelper;
+
+            public function __construct()
+            {
+                $this->dimensionElements = new ArrayCollection();
+                $this->dimensionHelper = new DimensionHelper('getDimensions', DimensionHelperInterface::class, $this, 'dimensionElements');
+            }
+
+            public function getDimensionElements(): Collection
+            {
+                return $this->dimensionElements;
+            }
+
+            public function getDimensions(?int $dimension = null, Collection $elements = null): Collection
+            {
+                return $this->dimensionHelper->getDimensions($dimension, $elements);
+            }
+        };
+    }
+
+    private function getContinueLoopResult($dimension): bool
+    {
+        $this->setProperty($this->dimensionMock->dimensionHelper, 'dimension', $dimension);
+
+        return $this->invokeMethod($this->dimensionMock->dimensionHelper, 'continueLoop');
+    }
+
+    public function testContinueLoop(): void
+    {
+        $this->assertTrue($this->getContinueLoopResult(null));
+        $this->assertTrue($this->getContinueLoopResult(2));
+        $this->assertTrue($this->getContinueLoopResult(1));
+        $this->assertFalse($this->getContinueLoopResult(0));
+        $this->assertFalse($this->getContinueLoopResult(-1));
+    }
+}