bootstrap.php

<?php

spl_autoload_register(
    function ($classNameSpace) {
        $classNameSpace = explode(DIRECTORY_SEPARATOR, str_replace('/', DIRECTORY_SEPARATOR, str_replace('\\', DIRECTORY_SEPARATOR, $classNameSpace)));

        foreach ($classNameSpace as $key => $value) {
            if (empty($value) || $value == '.' || $value == '..') {
                unset($classNameSpace[$key]);
            }
        }

        $classPath = __DIR__.DIRECTORY_SEPARATOR.'src'.DIRECTORY_SEPARATOR.implode(DIRECTORY_SEPARATOR, $classNameSpace).'.php';

        if (file_exists($classPath)) {
            require_once $classPath;

            return;
        }

        $classPath = __DIR__.DIRECTORY_SEPARATOR.'tests'.DIRECTORY_SEPARATOR.implode(DIRECTORY_SEPARATOR, $classNameSpace).'.php';

        if (file_exists($classPath)) {
            require_once $classPath;

            return;
        }
    }
);