message: move robot 0.5m in back for test
diff: <launch>
  <include file="$(find franka_gazebo)/launch/panda.launch">
  <arg name="controller" value="cartesian_impedance_example_controller"/>
  + <arg name="arm_id" value="panda"/>
  + <arg name="x" value="-0.5"/>
  + <arg name="world" value="$(find franka_gazebo)/test/world/stone.sdf"/>
  <arg name="headless" value="true"/> <!-- Set this to false for debugging -->
  </include>
  <test test-name="franka_gripper_sim_test" pkg="franka_gazebo" type="franka_gripper_sim_test" time-limit="600.0"/>
  