tests: Add more testing coverage to format_percent
tests: Add more testing coverage to format_percent

mitsuhiko/babel,python-babel/babel,KIT-XXI/babel,st4lk/babel,KIT-XXI/babel,st4lk/babel,iamshubh22/babel,mitsuhiko/babel,python-babel/babel,st4lk/babel,srisankethu/babel,KIT-XXI/babel,iamshubh22/babel,srisankethu/babel,srisankethu/babel,mitsuhiko/babel,iamshubh22/babel