// Any copyright is dedicated to the Public Domain.
// https://creativecommons.org/publicdomain/zero/1.0/
checkPublicSuffix(null, null);
checkPublicSuffix('COM', null);
checkPublicSuffix('example.COM', 'example.com');
checkPublicSuffix('WwW.example.COM', 'example.com');
checkPublicSuffix('.com', null);
checkPublicSuffix('.example', null);
checkPublicSuffix('.example.com', null);
checkPublicSuffix('.example.example', null);
checkPublicSuffix('example', null);
checkPublicSuffix('example.example', 'example.example');
checkPublicSuffix('b.example.example', 'example.example');
checkPublicSuffix('a.b.example.example', 'example.example');
// Listed, but non-Internet, TLD.
//checkPublicSuffix('local', null);
//checkPublicSuffix('example.local', null);
//checkPublicSuffix('b.example.local', null);
//checkPublicSuffix('a.b.example.local', null);
checkPublicSuffix('biz', null);
checkPublicSuffix('domain.biz', 'domain.biz');
checkPublicSuffix('b.domain.biz', 'domain.biz');
checkPublicSuffix('a.b.domain.biz', 'domain.biz');
// TLD with some 2-level rules.
checkPublicSuffix('com', null);
checkPublicSuffix('example.com', 'example.com');
checkPublicSuffix('b.example.com', 'example.com');
checkPublicSuffix('a.b.example.com', 'example.com');
checkPublicSuffix('uk.com', null);
checkPublicSuffix('example.uk.com', 'example.uk.com');
checkPublicSuffix('b.example.uk.com', 'example.uk.com');
checkPublicSuffix('a.b.example.uk.com', 'example.uk.com');
checkPublicSuffix('test.ac', 'test.ac');
// TLD with only 1 (wildcard) rule.
checkPublicSuffix('mm', null);
checkPublicSuffix('c.mm', null);
checkPublicSuffix('b.c.mm', 'b.c.mm');