tests/parity/README.md

# Parity

Every binding answers the same question, so every binding has to give the same
answer. These probes ask each one for the same twelve days and compare all
twenty-two fields against what the command line says.

The probes are chosen for the places the bindings could plausibly disagree:
Pascha itself, the Nativity on both calendars, a Wednesday of the Great Fast
under Byzantine Catholic law and again at the Typikon, a weekday of the
Nativity Fast where Greek and Slavic usage part, the one Orthodox church on the
Gregorian Paschalion, and a day with no feast at all.

Run them with `tests/parity.sh`. Surfaces whose toolchain is absent are skipped
by name rather than silently passed.
ask every binding the same question and insist on the same answer 2026-09-18 16:08:41 -04:00			`# Parity`

			`Every binding answers the same question, so every binding has to give the same`
			`answer. These probes ask each one for the same twelve days and compare all`
			`twenty-two fields against what the command line says.`

			`The probes are chosen for the places the bindings could plausibly disagree:`
			`Pascha itself, the Nativity on both calendars, a Wednesday of the Great Fast`
			`under Byzantine Catholic law and again at the Typikon, a weekday of the`
			`Nativity Fast where Greek and Slavic usage part, the one Orthodox church on the`
			`Gregorian Paschalion, and a day with no feast at all.`

			Run them with `tests/parity.sh`. Surfaces whose toolchain is absent are skipped
			`by name rather than silently passed.`