# tests/test_dut.py

import pytest

def test_dut_version(dut):
    """Ensure the DUT returns a version string in sim mode."""
    version = dut.get_version()
    assert version.startswith("sim-")

def test_dut_temperature(dut):
    """Test readback of simulated temperature."""
    temp = dut.read_temperature()
    assert 20 <= temp <= 100  # Acceptable range