To test PIM integration with Magento 2, first connect the PIM system using the correct API settings. Make sure product details like names, categories, and images match in both systems. During testing, focus on the Magento 2 PIM Integration by syncing sample products and checking if they appear correctly in Magento. Watch for errors or missing info. Finally, test syncing a larger batch of products to make sure the integration works smoothly and handles data without issues.