import pytest

from calc import calc


def test_add():
    assert calc(2, "+", 3) == 5


def test_divide():
    assert calc(6, "/", 2) == 3.0


def test_divide_float():
    assert calc(7, "/", 2) == 3.5


def test_unknown():
    with pytest.raises(ValueError):
        calc(1, "%", 2)