old_contents: from rpi_backlight.utils import FakeBacklightSysfs
  
  
  def test_fake_sysfs_backlight() -> None:
      with FakeBacklightSysfs() as backlight_sysfs:
          assert backlight_sysfs.path.exists() is True
          for filename in (
              "bl_power",
              "brightness",
              "actual_brightness",
              "max_brightness",
          ):
              assert (backlight_sysfs.path / filename).exists() is True
  
      assert backlight_sysfs.path.exists() is False
  
new_contents: from pathlib import Path
  
  import pytest
  
  from rpi_backlight import BoardType
  from rpi_backlight.utils import FakeBacklightSysfs, detect_board_type
  
  
  def test_fake_sysfs_backlight() -> None:
      with FakeBacklightSysfs() as backlight_sysfs:
          assert backlight_sysfs.path.exists() is True
          for filename in (
              "bl_power",
              "brightness",
              "actual_brightness",
              "max_brightness",
          ):
              assert (backlight_sysfs.path / filename).exists() is True
  
      assert backlight_sysfs.path.exists() is False
  
  
  @pytest.mark.parametrize(
      "model,board_type",
      [
          ("Raspberry Pi 3 Model B Rev 1.2", BoardType.RASPBERRY_PI),
          ("Raspberry Pi 42", BoardType.RASPBERRY_PI),
          ("Raspberry Pi", BoardType.RASPBERRY_PI),
          ("ASUS Tinker Board 2", BoardType.TINKER_BOARD_2),
          ("ASUS Tinker Board 2S", BoardType.TINKER_BOARD_2),
          ("Tinker Board 2", BoardType.TINKER_BOARD_2),
          ("Tinker Board 2S", BoardType.TINKER_BOARD_2),
          ("Rockchip RK3288 Asus Tinker Board", BoardType.TINKER_BOARD),
          ("Rockchip RK3288 Asus Tinker Board S", BoardType.TINKER_BOARD),
          ("Tinker Board", BoardType.TINKER_BOARD),
          ("Something else", None),
      ],
  )
  def test_detect_board_type(monkeypatch, model, board_type) -> None:
      monkeypatch.setattr(Path, "read_text", lambda self: model)
  
      assert detect_board_type() == board_type
  
subject: Add tests for utils.detect_board_type()