A.php

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<?php
namespace Magento\Test\Di\Child\Interceptor;

class A
{
    protected $_wrapperSym;

    public function __construct($wrapperSym = 'A')
    {
        $this->_wrapperSym = $wrapperSym;
    }

    public function wrapBefore($param)
    {
        return $this->_wrapperSym . $param . $this->_wrapperSym;
    }

    public function wrapAfter($returnValue)
    {
        return '_' . $this->_wrapperSym . '_' . $returnValue . '_' . $this->_wrapperSym . '_';
    }
}