"""Tests for the tasks-app core logic — the kind of suite Module 13 has you write.

Reproduced here so this module's lab is self-contained: if you already wrote tests in Module 13,
use those instead. Run locally with `pytest -q` from the project folder. CI runs exactly this.
"""

from tasks import TaskList


def test_add_appends_a_task():
    tl = TaskList()
    tl.add("write the CI lesson")
    assert len(tl.tasks) == 1
    assert tl.tasks[0].title == "write the CI lesson"
    assert tl.tasks[0].done is False


def test_complete_marks_a_task_done():
    tl = TaskList()
    tl.add("ship it")
    tl.complete(0)
    assert tl.tasks[0].done is True


def test_pending_excludes_completed_tasks():
    tl = TaskList()
    tl.add("a")
    tl.add("b")
    tl.complete(0)
    pending = tl.pending()
    assert len(pending) == 1
    assert pending[0].title == "b"


def test_render_is_friendly_when_empty():
    assert TaskList().render() == "(no tasks yet)"