Quick answer
GroceryBilling offers a free, browser-only readiness checklist that helps owners verify barcode checkout, returns, stock counts, cashier shifts, digital baskets and exports. These are self-assessment tools—not automatic diagnostics or proof that any particular register has passed its tests.
Start with a complete checkout rehearsal
Try 12 scenarios from barcode scans through refunds and handover, and identify what needs another test before store launch. The tool runs locally in the browser and does not request credentials, business data or payment information.