1..8
# ->configure()
 -  throws an InvalidArgumentException if a country does not exist
 -  can restrict the number of countries with the countries option
# ->render()
 -  renders all countries as option tags
 -  renders all countries as option tags
 -  does not contain dummy data
 -  does not contain region data
# add_empty
 -  renders an empty option if add_empty is true
 -  renders an empty option if add_empty is true
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