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# -*- coding: utf-8 -*-
"""These test the utils.py functions."""
from typing import Optional, Tuple, Union
import pytest
from hypothesis import given
from hypothesis.strategies import floats, integers
from natsort.ns_enum import NSType, ns
from natsort.utils import NumTransformer, parse_number_or_none_factory
@pytest.mark.usefixtures("with_locale_en_us")
@pytest.mark.parametrize(
"alg, example_func",
[
(ns.DEFAULT, lambda x: ("", x)),
(ns.PATH, lambda x: (("", x),)),
(ns.UNGROUPLETTERS | ns.LOCALE, lambda x: (("xx",), ("", x))),
(ns.PATH | ns.UNGROUPLETTERS | ns.LOCALE, lambda x: ((("xx",), ("", x)),)),
],
)
@given(x=floats(allow_nan=False) | integers())
def test_parse_number_factory_makes_function_that_returns_tuple(
x: Union[float, int], alg: NSType, example_func: NumTransformer
) -> None:
parse_number_func = parse_number_or_none_factory(alg, "", "xx")
assert parse_number_func(x) == example_func(x)
@pytest.mark.parametrize(
"alg, x, result",
[
(ns.DEFAULT, 57, ("", 57)),
(ns.DEFAULT, float("nan"), ("", float("-inf"))), # NaN transformed to -infinity
(ns.NANLAST, float("nan"), ("", float("+inf"))), # NANLAST makes it +infinity
(ns.DEFAULT, None, ("", float("-inf"))), # None transformed to -infinity
(ns.NANLAST, None, ("", float("+inf"))), # NANLAST makes it +infinity
],
)
def test_parse_number_factory_treats_nan_and_none_special(
alg: NSType, x: Optional[Union[float, int]], result: Tuple[str, Union[float, int]]
) -> None:
parse_number_func = parse_number_or_none_factory(alg, "", "xx")
assert parse_number_func(x) == result
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