no test coverage for required parameters

[nothingmuch]

The following test does not actually utilize required parameters, it just checks that non-required parameters are omitted if not required, so it should probably be renamed, and a new test should be introduced that actually checks that parameters with req- prefix are mandatory and that they can be parsed correctly when required.

bitcoin_uri/src/lib.rs

Lines 423 to 433 in 9362fab

	#[test]
	fn required_understood() {
	let input = "bitcoin:1andreas3batLhQa2FawWjeyjCqyBzypd?somethingyoudontunderstand=50&somethingelseyoudontget=999";
	let uri = input.parse::<Uri<'_, _>>().unwrap().require_network(bitcoin::Network::Bitcoin).unwrap();
	assert_eq!(uri.address.to_string(), "1andreas3batLhQa2FawWjeyjCqyBzypd");
	assert!(uri.amount.is_none());
	assert!(uri.label.is_none());
	assert!(uri.message.is_none());
	assert_eq!(uri.to_string(), "bitcoin:1andreas3batLhQa2FawWjeyjCqyBzypd");
	}

See payjoin/rust-payjoin#433 for related discussion