import pytest
from pydantic import ValidationError

from main import todocreate


def test_todocreate_requires_task() -> None:
    with pytest.raises(ValidationError):
        todocreate()

def test_todocreate_accepts_valid_task() -> None:
    todo_data = todocreate(task = "学习测试单元")
    
    assert todo_data.task == "学习测试单元"

def test_todocreate_rejects_empty_task() -> None:
    with pytest.raises(ValidationError):
        todocreate(task="")

def test_todocreate_rejects_blank_task() -> None:
    with pytest.raises(ValidationError):
        todocreate(task="   ")

def test_todocreate_rejects_task_longer_than_200_characters() -> None:
    long_task = "a" * 201

    with pytest.raises(ValidationError):
        todocreate(task=long_task)