roll/tests/roll_test.py

import pytest

from roll.roll import Roll


def test_roll_validation():
    with pytest.raises(ValueError):
        Roll(0, 20)
    with pytest.raises(ValueError):
        Roll(1, 1)


@pytest.mark.parametrize(
    ("roll", "expected"),
    [(Roll(1, 20), "1d20"), (Roll(2, 20, 3), "2d20+3"), (Roll(4, 6, -3), "4d6-3")],
)
def test_str_roundtrip(roll: Roll, expected: str):
    assert roll.to_str() == expected
    assert Roll.from_str(expected) == roll


@pytest.mark.parametrize("roll", ["d90", "0d0", "-1d-1", "aba", "000", "1d1d1d"])
def test_from_bad_str(roll: str):
    with pytest.raises(ValueError):
        Roll.from_str(roll)


def test_modify():
    roll = Roll(2, 20)
    modified_roll = roll.modify(3)
    assert modified_roll == Roll(2, 20, 3)
    assert roll == Roll(2, 20)
    assert modified_roll is not roll and modified_roll != roll


@pytest.mark.parametrize("n", list(range(1, 5)))
@pytest.mark.parametrize("sides", list(range(2, 100)))
def test_throw(n: int, sides: int):
    roll = Roll(n, sides)
    throw = roll.throw()
    assert len(throw.results) == n
    assert all(1 <= result <= sides for result in throw.results)