HTMLT tests are a compact and easy-to-use way of making assertPurification
type tests. They take the format of:
--INI--
Ns.Directive = "directive value"
--HTML--
Input HTML
--EXPECT--
Expected HTML
Expect more features and migration to be coming soon.
Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>