from io import StringIO

import pytest

from pandas import read_sas
import pandas._testing as tm


class TestSas:
    def test_sas_buffer_format(self):
        # see gh-14947
        b = StringIO("")

        msg = (
            "If this is a buffer object rather than a string "
            "name, you must specify a format string"
        )
        with pytest.raises(ValueError, match=msg):
            read_sas(b)

    def test_sas_read_no_format_or_extension(self):
        # see gh-24548
        msg = "unable to infer format of SAS file"
        with tm.ensure_clean("test_file_no_extension") as path:
            with pytest.raises(ValueError, match=msg):
                read_sas(path)