AutogeneratedClassNotInConstructorSniff fails with specific code

[xmav]

Preconditions

Steps to reproduce

1. Run AutogeneratedClassNotInConstructorSniff sniff on class with the following code

        $objectManager = ObjectManager::getInstance();
         $this->_entityFactory = $objectManager->get(EntityFactoryInterface::class);

Expected result

Sniff should not trigger error

Actual result

An error occurred during processing; checking has been aborted. The error message was: Undefined variable:
 className in
 /var/www/html/vendor/magento/magento-coding-standard/Magento2/Sniffs/PHP/AutogeneratedClassNotInConstructorSniff.php
 on line 224

Also please test it with

    /**
     * Retrieve ObjectManager from global scope
     *
     * @return void
     */
    public function __wakeup()
    {
        $this->_objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    }

[m2-assistant]

Hi @xmav. Thank you for your report.
To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

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