test_tag_from_language ("XYZ", "xyz"); /* Unknown ISO 639-3 */
test_tag_from_language ("XYZ", "xyz-qw"); /* Unknown ISO 639-3 */
+ /* International Phonetic Alphabet */
+ test_tag_from_language ("IPPH", "en-fonipa");
+ test_tag_from_language ("IPPH", "rm-CH-fonipa-sursilv-x-foobar");
+ test_tag_from_language ("IPPH", "und-fonipa");
+ test_tag_from_language ("IPPH", "zh-fonipa");
+ test_tag_to_language ("IPPH", "und-fonipa");
+
/* Test that x-hbot overrides the base language */
test_tag_from_language ("ABC", "fa-x-hbotabc-zxc");
test_tag_from_language ("ABC", "fa-ir-x-hbotabc-zxc");