'Test xl_col_to_name()'

def test_xl_col_to_name(self):

    tests = [(0, 'A'), (1, 'B'), (2, 'C'), (9, 'J'), (24, 'Y'), (25, 'Z'), (26, 'AA'), (254, 'IU'), (255, 'IV'), (256, 'IW'), (16383, 'XFD'), (16384, 'XFE')]
    for (col, string) in tests:
        exp = string
        got = xl_col_to_name(col)
        self.assertEqual(got, exp)
