def test_invalid_iso_code_returns_none(self):
    assert (country_iso_code_to_name('FOO') is None)
    assert (country_iso_code_to_name('ABC') is None)
    assert (country_iso_code_to_name('ZZZ') is None)
def test_invalid_iso_code_returns_none(self):
    assert (country_iso_code_to_name('FOO') is None)
    assert (country_iso_code_to_name('ABC') is None)
    assert (country_iso_code_to_name('ZZZ') is None)