Refactored other PHPUnit method calls to work with namespaced PHPUnit 6

Author: peterrehm

Tests/ParserTest.php

@@ -41,7 +41,11 @@ public function testSpecifications($file, $expected, $yaml, $comment, $deprecate
                 if (E_USER_DEPRECATED !== $type) {
                     restore_error_handler();
 
-                    return call_user_func_array('PHPUnit_Util_ErrorHandler::handleError', func_get_args());
+                    if (class_exists('PHPUnit_Util_ErrorHandler')) {
+                        return call_user_func_array('PHPUnit_Util_ErrorHandler::handleError', func_get_args());
+                    }
+
+                    return call_user_func_array('PHPUnit\Util\ErrorHandler::handleError', func_get_args());
                 }
 
                 $deprecations[] = $msg;