PHP7 Singleton und Multiton

Creational/Singleton/Singleton.php

@@ -2,7 +2,7 @@
 
 namespace DesignPatterns\Creational\Singleton;
 
-class Singleton
+final class Singleton
 {
     /**
      * @var Singleton
@@ -31,21 +31,15 @@ class Singleton
 
     /**
      * prevent the instance from being cloned (which would create a second instance of it)
-     *
-     * @throws SingletonPatternViolationException
      */
-    final public function __clone()
+    private function __clone()
     {
-        throw new \Exception('This is a Singleton. __clone is forbidden');
     }
 
     /**
      * prevent from being unserialized (which would create a second instance of it)
-     *
-     * @throws SingletonPatternViolationException
      */
-    final public function __wakeup()
+    private function __wakeup()
     {
-        throw new \Exception('This is a Singleton. __wakeup is forbidden');
     }
 }

Creational/Singleton/SingletonPatternViolationException.php

@@ -1,7 +0,0 @@
-<?php
-
-namespace DesignPatterns\Creational\Singleton;
-
-class SingletonPatternViolationException extends \Exception
-{
-}

Creational/Singleton/Tests/SingletonTest.php

@@ -14,23 +14,4 @@ class SingletonTest extends \PHPUnit_Framework_TestCase
         $this->assertInstanceOf('DesignPatterns\Creational\Singleton\Singleton', $firstCall);
         $this->assertSame($firstCall, $secondCall);
     }
-
-    /**
-     * @expectedException \DesignPatterns\Creational\Singleton\SingletonPatternViolationException
-     */
-    public function testNoCloneAllowed()
-    {
-        $obj1 = Singleton::getInstance();
-        $obj2 = clone $obj1;
-    }
-
-    /**
-     * @expectedException \DesignPatterns\Creational\Singleton\SingletonPatternViolationException
-     */
-    public function testNoSerializationAllowed()
-    {
-        $obj1 = Singleton::getInstance();
-        $serialized = serialize($obj1);
-        unserialize($serialized);
-    }
 }