"""Verify that the agents/ package does not introduce accidental coupling
into the existing runtime/ modules (task 7.2)."""

from __future__ import annotations

import importlib


def test_runtime_planner_unchanged() -> None:
    """Planner should not import from agents/."""
    module = importlib.import_module("runtime.planner")
    source = open(module.__file__).read()  # type: ignore[arg-type]
    assert "agents" not in source


def test_runtime_executor_unchanged() -> None:
    """Executor should not import from agents/."""
    module = importlib.import_module("runtime.executor")
    source = open(module.__file__).read()  # type: ignore[arg-type]
    assert "agents" not in source


def test_runtime_task_unchanged() -> None:
    """TaskRunner should not import from agents/."""
    module = importlib.import_module("runtime.task")
    source = open(module.__file__).read()  # type: ignore[arg-type]
    assert "agents" not in source


def test_agents_imports_runtime() -> None:
    """agents/ should import from runtime/, not the other way around."""
    collab = importlib.import_module("agents.collab_runner")
    source = open(collab.__file__).read()  # type: ignore[arg-type]
    assert "runtime.task" in source
    assert "runtime.planner" in source
    assert "runtime.executor" in source