Fixed AbstractHandler test

tests/Monolog/Handler/AbstractHandlerTest.php

@@ -23,7 +23,7 @@ class AbstractHandlerTest extends \PHPUnit_Framework_TestCase
 
     public function testHandleLowerLevelMessage()
     {
-        $handler = new TestHandler();
+        $handler = new TestHandler(Logger::WARNING);
         $this->assertFalse($handler->handle($this->getMessage(Logger::DEBUG)));
     }
 
@@ -45,10 +45,3 @@ class AbstractHandlerTest extends \PHPUnit_Framework_TestCase
         );
     }
 }
-
-class TestHandler extends AbstractHandler
-{
-    public function write($message)
-    {
-    }
-}