fix php5.3 compatibility error

Author: jaapio

tests/unit/phpDocumentor/Reflection/BaseReflectorTest.php

@@ -36,7 +36,7 @@ public function testSetNameSpace()
     {
         /** @var BaseReflector $base_reflector  */
         $base_reflector = new BaseReflectorMock(
-            $this->getMockBuilder(\PhpParser\Node\Stmt::class)->disableOriginalConstructor()->getMock(),
+            $this->getMockBuilder('\PhpParser\Node\Stmt')->disableOriginalConstructor()->getMock(),
             new Context()
         );
         $base_reflector->setNamespace('namespace_name');
@@ -57,7 +57,7 @@ public function testSetNameSpaceInvalidArgument()
     {
         /** @var BaseReflector $base_reflector  */
         $base_reflector = new BaseReflectorMock(
-            $this->getMockBuilder(\PhpParser\Node\Stmt::class)->disableOriginalConstructor()->getMock(),
+            $this->getMockBuilder('\PhpParser\Node\Stmt')->disableOriginalConstructor()->getMock(),
             new Context()
         );
         $base_reflector->setNamespace(null);