import pytest

rclpy = pytest.importorskip('rclpy')


def test_the_node_constructs_without_a_token_and_does_not_serve(monkeypatch):
    """Declaring a parameter twice raises at construction, and nothing else exercises the node."""
    monkeypatch.delenv('ROBOT_MCP_TOKEN', raising=False)
    from hermes_mcp.mcp_node import McpNode
    rclpy.init()
    try:
        node = McpNode()
        assert node.activity is None            # no token: not serving, no heartbeat
        node.destroy_node()
    finally:
        rclpy.shutdown()