Test unexpected eu.at_02.compact result

Author: holvitolv

stdnum/eu/at_02.py

@@ -32,6 +32,8 @@
 'ES2300047690558N'
 >>> compact('ES++()+23ZZZ4//7690558N')
 'ES23ZZZ47690558N'
+>>> compact('mtxxzzz670169305t') # EPC262-08 Version 12.0 / 8.1.15 Malta, example identifier, lowercased
+'TXXZZZ670169305T'
 >>> calc_check_digits('ESXXZZZ47690558N')
 '23'
 """