def test_radix_sort_long_string(): assert (radix_sort_string(['Four', 'score', 'and', 'seven', 'years', 'ago']) == ['Four', 'ago', 'and', 'score', 'seven', 'years'])
def test_radix_sort_string_empty(): assert radix_sort_string([]) == []
def test_radix_sort_strings(): assert radix_sort_string(['a', 'd', 'b', 'c']) == ['a', 'b', 'c', 'd']
def test_radix_sort_long_string(): assert (radix_sort_string( ['Four', 'score', 'and', 'seven', 'years', 'ago']) == ['Four', 'ago', 'and', 'score', 'seven', 'years'])