product_in_category.php

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<?php
require __DIR__ . '/product.php';

$categoryLinkManagement = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()
    ->create(\Magento\Catalog\Api\CategoryLinkManagementInterface::class);

$categoryLinkManagement->assignProductToCategories(
    $product->getSku(),
    [2]
);