Posted by Pharo Smalltalk Users mailing list on Sep 07, 2020; 4:19pm
URL: https://forum.world.st/Can-it-do-this-way-tp5121193p5121430.html

See here for all the tests :
https://github.com/exercism/pharo-smalltalk/blob/master/exercises/isbn-verifier/IsbnVerifierTest.class.st#L88

Roelof