fix unit tests (minimal)

tests/test_motors.py

@@ -3,7 +3,6 @@ import time
 import numpy as np
 import pytest
 
-from lerobot.common.robot_devices.motors.dynamixel import DynamixelMotorsBus, find_port
 from lerobot.common.robot_devices.utils import RobotDeviceAlreadyConnectedError, RobotDeviceNotConnectedError
 from tests.utils import require_koch
 
@@ -14,6 +13,7 @@ def test_motors_bus(request):
     # TODO(rcadene): test logs
     # TODO(rcadene): test calibration
     # TODO(rcadene): add compatibility with other motors bus
+    from lerobot.common.robot_devices.motors.dynamixel import DynamixelMotorsBus
 
     # Test instantiating a common motors structure.
     # Here the one from Alexander Koch follower arm.
@@ -87,4 +87,6 @@ def test_motors_bus(request):
 
 @require_koch
 def test_find_port(request):
+    from lerobot.common.robot_devices.motors.dynamixel import find_port
+
     find_port()

tests/test_robots.py

@@ -5,7 +5,6 @@ import pytest
 import torch
 
 from lerobot.common.robot_devices.robots.factory import make_robot
-from lerobot.common.robot_devices.robots.koch import KochRobot
 from lerobot.common.robot_devices.utils import RobotDeviceAlreadyConnectedError, RobotDeviceNotConnectedError
 from tests.utils import require_koch
 
@@ -15,6 +14,7 @@ def test_robot(tmpdir, request):
     # TODO(rcadene): measure fps in nightly?
     # TODO(rcadene): test logs
     # TODO(rcadene): add compatibility with other robots
+    from lerobot.common.robot_devices.robots.koch import KochRobot
 
     # Save calibration preset
     calibration = {