Code the handlers

Code the handlers to make the first tests pass

The next step is to implement the first two handlers so that the tests swap_ui_only and swap_wrong_refund pass.

Test swap_ui_only

This test stops before sending the START_SIGNING_TRANSACTION APDU. That means no coin signature takes place; the only handlers called are swap_handle_check_address() and swap_handle_get_printable_amount().

You can use this test to validate that:

• swap_handle_check_address() correctly recognizes the valid_destination_1 address.
• swap_handle_get_printable_amount() correctly formats the amount for display.

Don't forget to run ragger with the --golden_run option when creating or updating the snapshots.

Test swap_wrong_refund

This test sends a refund address that does not belong to the device.

You can use this test to validate that swap_handle_check_address() correctly rejects the fake_refund address.

Code the last handler and the UI bypass

You can now implement the swap_copy_transaction_parameters() handler.

You can also implement the UI bypass for the final transaction signature.

Please refer to the UI bypass documentation carefully.

Please refer to the Coin application error codes to learn how to handle a refusal of the final transaction.

All tests should now pass.