from datetime import UTC, datetime
from types import SimpleNamespace

from app.memory.context_builder import ContextBuilder


def test_context_keeps_summary_and_newest_messages_within_limit() -> None:
    builder = ContextBuilder(token_limit=100)
    summary = SimpleNamespace(text="goal: keep deployment simple")
    messages = [
        SimpleNamespace(sent_at=datetime.now(UTC), user_name="A", text="old " * 20),
        SimpleNamespace(sent_at=datetime.now(UTC), user_name="B", text="new fact"),
    ]
    result = builder.build(summary, messages)
    assert "goal" in result
    assert "new fact" in result