diff --git a/application/src/Entity/Source/Operation/AbstractOperation.php b/application/src/Entity/Source/Operation/AbstractOperation.php
index f57c4fe..b981d07 100644
--- a/application/src/Entity/Source/Operation/AbstractOperation.php
+++ b/application/src/Entity/Source/Operation/AbstractOperation.php
@@ -8,6 +8,7 @@ use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\ORM\Mapping as ORM;
 use App\Entity\Source\AbstractSource;
 use App\Entity\Source\Operation\Attribut\OperandsAttribut;
+use App\Exception\NotProcessedException;
 
 /**
  * @author kevinfrantz
@@ -41,7 +42,10 @@ abstract class AbstractOperation extends AbstractSource implements OperandInterf
 
     public function getResult(): ResultInterface
     {
-        return $this->result;
+        if ($this->result) {
+            return $this->result;
+        }
+        throw new NotProcessedException('No result was generated!');
     }
 
     public function setOperators(ArrayCollection $operands): void
diff --git a/application/src/Entity/Source/Operation/AndOperation.php b/application/src/Entity/Source/Operation/AndOperation.php
index c1c2c6a..15516ed 100644
--- a/application/src/Entity/Source/Operation/AndOperation.php
+++ b/application/src/Entity/Source/Operation/AndOperation.php
@@ -5,6 +5,7 @@ namespace App\Entity\Source\Operation;
 use App\Logic\Operation\OperandInterface;
 use App\Logic\Result\Result;
 use Doctrine\ORM\Mapping as ORM;
+use App\Exception\NotDefinedException;
 
 /**
  * @author kevinfrantz
@@ -16,7 +17,7 @@ final class AndOperation extends AbstractOperation
     public function process(): void
     {
         if ($this->operands->isEmpty()) {
-            throw new \Exception('Operands must be defined!');
+            throw new NotDefinedException('Operands must be defined!');
         }
         $this->result = new Result();
         /*
diff --git a/application/src/Exception/NotDefinedException.php b/application/src/Exception/NotDefinedException.php
new file mode 100644
index 0000000..60ed320
--- /dev/null
+++ b/application/src/Exception/NotDefinedException.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Exception;
+
+class NotDefinedException extends \Exception
+{
+    public function __construct($message = null)
+    {
+        parent::__construct($message);
+    }
+}
diff --git a/application/src/Exception/NotProcessedException.php b/application/src/Exception/NotProcessedException.php
new file mode 100644
index 0000000..3ee1e54
--- /dev/null
+++ b/application/src/Exception/NotProcessedException.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Exception;
+
+class NotProcessedException extends \Exception
+{
+    public function __construct($message = null)
+    {
+        parent::__construct($message);
+    }
+}
diff --git a/application/tests/unit/Entity/Source/Operation/AbstractOperationTest.php b/application/tests/unit/Entity/Source/Operation/AbstractOperationTest.php
index eab9bf9..ceb860b 100644
--- a/application/tests/unit/Entity/Source/Operation/AbstractOperationTest.php
+++ b/application/tests/unit/Entity/Source/Operation/AbstractOperationTest.php
@@ -10,6 +10,7 @@ use Doctrine\Common\Collections\ArrayCollection;
 use App\Logic\Operation\OperandInterface;
 use App\Logic\Result\ResultInterface;
 use App\Logic\Result\Result;
+use App\Exception\NotProcessedException;
 
 class AbstractOperationTest extends TestCase
 {
@@ -21,14 +22,9 @@ class AbstractOperationTest extends TestCase
     public function setUp(): void
     {
         $this->operation = new class() extends AbstractOperation {
-            public function getResult(): ResultInterface
-            {
-                return new Result();
-            }
-
             public function process(): void
             {
-                return;
+                $this->result = new Result();
             }
         };
     }
@@ -49,11 +45,20 @@ class AbstractOperationTest extends TestCase
         $operands = new ArrayCollection();
         $operands->add($operand);
         $this->operation->setOperands($operands);
-        $this->assertEquals($operand, $this->operation->getOperands()->get(0));
+        $this->assertEquals($operand, $this->operation->getOperands()
+            ->get(0));
     }
 
-    public function testResult()
+    public function testNotProcessedException(): void
     {
+        $this->expectException(NotProcessedException::class);
+        $this->operation->getResult();
+    }
+
+    public function testResult(): void
+    {
+        $this->setUp();
+        $this->operation->process();
         $this->assertInstanceOf(ResultInterface::class, $this->operation->getResult());
     }
 
diff --git a/application/tests/unit/Entity/Source/Operation/AndOperationTest.php b/application/tests/unit/Entity/Source/Operation/AndOperationTest.php
new file mode 100644
index 0000000..d2bbe47
--- /dev/null
+++ b/application/tests/unit/Entity/Source/Operation/AndOperationTest.php
@@ -0,0 +1,71 @@
+<?php
+
+namespace App\Entity\Source\Operation;
+
+use PHPUnit\Framework\TestCase;
+use App\Exception\NotDefinedException;
+use App\Logic\Result\Result;
+use App\Logic\Operation\OperandInterface;
+use App\Logic\Result\ResultInterface;
+use Doctrine\Common\Collections\ArrayCollection;
+
+class AndOperationTest extends TestCase
+{
+    /**
+     * @var OperationInterface
+     */
+    protected $operation;
+
+    public function setUp(): void
+    {
+        $this->operation = new AndOperation();
+    }
+
+    public function testConstructor(): void
+    {
+        $this->expectException(NotDefinedException::class);
+        $this->operation->process();
+    }
+
+    public function testProcess(): void
+    {
+        //Test True
+        $operand1 = new class() implements OperandInterface {
+            public function getResult(): ResultInterface
+            {
+                $result = new Result();
+                $result->setAll(true);
+
+                return $result;
+            }
+        };
+
+        $operand2 = new class() implements OperandInterface {
+            public function getResult(): ResultInterface
+            {
+                $result = new Result();
+                $result->setAll(true);
+
+                return $result;
+            }
+        };
+        $operands = new ArrayCollection([$operand1, $operand2]);
+        $this->operation->setOperands($operands);
+        $this->operation->process();
+        $this->assertEquals(true, $this->operation->getResult()->getBool());
+
+        //Test False
+        $operand3 = new class() implements OperandInterface {
+            public function getResult(): ResultInterface
+            {
+                $result = new Result();
+                $result->setAll(false);
+
+                return $result;
+            }
+        };
+        $this->operation->getOperands()->add($operand3);
+        $this->operation->process();
+        $this->assertEquals(false, $this->operation->getResult()->getBool());
+    }
+}