test: use exit handler instead of func override

Author: adhocore

tests/DefaultOptionTest.php

@@ -40,6 +40,8 @@ protected function newParser(string $version = '0.0.1', string $desc = '', bool
     {
         $p = new ArgvParser('ArgvParserTest', $desc, $allowUnknown);
 
-        return $p->version($version);
+        return $p->version($version)->onExit(function () {
+            return false;
+        });
     }
 }

tests/bootstrap.php

@@ -1,10 +1,3 @@
 <?php
 
-namespace Ahc\Cli;
-
-function _exit($code = 0)
-{
-    echo "exit($code)";
-}
-
 require_once __DIR__ . '/../vendor/autoload.php';