diff --git a/Math/Matrix/Vector.php b/Math/Matrix/Vector.php
index bd0da5754..5def2d31f 100644
--- a/Math/Matrix/Vector.php
+++ b/Math/Matrix/Vector.php
@@ -37,6 +37,4 @@ class Vector extends Matrix
     {
         parent::__construct($m);
     }
-
-    // todo: maybe overwrite setMatrix since only one column (is only a visual improvement)
 }
\ No newline at end of file
diff --git a/Math/Number/Irrational.php b/Math/Number/Irrational.php
deleted file mode 100644
index 7de55fce8..000000000
--- a/Math/Number/Irrational.php
+++ /dev/null
@@ -1,21 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 7.1
- *
- * @category   TBD
- * @package    TBD
- * @copyright  Dennis Eichhorn
- * @license    OMS License 1.0
- * @version    1.0.0
- * @link       http://website.orange-management.de
- */
-declare(strict_types = 1);
-
-namespace phpOMS\Math\Number;
-
-class Irrational
-{
-
-}
\ No newline at end of file
diff --git a/Math/Number/Rational.php b/Math/Number/Rational.php
deleted file mode 100644
index 863dc5739..000000000
--- a/Math/Number/Rational.php
+++ /dev/null
@@ -1,21 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 7.1
- *
- * @category   TBD
- * @package    TBD
- * @copyright  Dennis Eichhorn
- * @license    OMS License 1.0
- * @version    1.0.0
- * @link       http://website.orange-management.de
- */
-declare(strict_types = 1);
-
-namespace phpOMS\Math\Number;
-
-class Rational
-{
-
-}
\ No newline at end of file
diff --git a/Math/Number/Real.php b/Math/Number/Real.php
deleted file mode 100644
index a7b6f4923..000000000
--- a/Math/Number/Real.php
+++ /dev/null
@@ -1,21 +0,0 @@
-<?php
-/**
- * Orange Management
- *
- * PHP Version 7.1
- *
- * @category   TBD
- * @package    TBD
- * @copyright  Dennis Eichhorn
- * @license    OMS License 1.0
- * @version    1.0.0
- * @link       http://website.orange-management.de
- */
-declare(strict_types = 1);
-
-namespace phpOMS\Math\Number;
-
-class Real
-{
-
-}
\ No newline at end of file
diff --git a/Utils/TestUtils.php b/Utils/TestUtils.php
index b77bdd0ce..04c3cb951 100644
--- a/Utils/TestUtils.php
+++ b/Utils/TestUtils.php
@@ -29,7 +29,7 @@ class TestUtils
     /**
      * Set private object member
      *
-     * @param object $obj Object to modify
+     * @param object||string $obj Object to modify
      * @param string $name Member name to modify
      * @param mixed $value Value to set
      *
@@ -39,7 +39,7 @@ class TestUtils
      */
     public static function setMember(/* object */ $obj, string $name, $value) : bool
     {
-        $reflectionClass = new \ReflectionClass(get_class($obj));
+        $reflectionClass = new \ReflectionClass(is_string($obj) ? $obj : get_class($obj));
         
         if (!$reflectionClass->hasProperty($name)) {
             return false;
@@ -63,16 +63,16 @@ class TestUtils
     /**
      * Get private object member
      *
-     * @param object $obj Object to read
+     * @param object||string $obj Object to read
      * @param string $name Member name to read
      *
      * @return mixed Returns the member variable value
      *
      * @since  1.0.0
      */
-    public static function getMember(/* object */ $obj, string $name) 
+    public static function getMember($obj, string $name) 
     {
-        $reflectionClass = new \ReflectionClass(get_class($obj));
+        $reflectionClass = new \ReflectionClass(is_string($obj) ? $obj : get_class($obj));
         
         if (!$reflectionClass->hasProperty($name)) {
             return null;