Paste the multi-output URI examples from the added test and from the bip21-ecash-additions.md document into the payto field, and check that the transactions are created as expected.
Test also other examples from the test_bip21 test suite in the GUI, especially the exotic ones such as `ecash:?op_return_raw=04deadbeef` (takes one input randomly and creates an op_return output and a change output) and `ecash:?r=http://domain.tld/page?h%3D2a8628fc2fbe` (this one will not work because the bip70 url is invalid, but it should still try to resolve it and give a meaningful error message).
`python test_runner.py`