Making a batch payment of Test Payments isn't supported as a regular batch option, but it's possible through a simple workaround:
Initiate a test payment as you regular do (→ How to make a test payment)
(Request create the test payment as a Direct Payment in the background)
Don't confirm the payment with your wallet (the test payment will still exist as a Direct Payment)
Navigate to Payments > Direct Payments
Filter for Payment Type = "Test" and Status = "Awaiting Payment" to filter any pending test payments
Select the test payments and click Batch Payment
Proceed with the payment as usual
