test.world

<?xml version="1.0"?>
<sdf version="1.4">
  <world name="default">

    <!-- Ground Plane -->
    <include>
      <uri>model://ground_plane</uri>
    </include>

    <include>
      <uri>model://sun</uri>
    </include>

    <include>
      <uri>model://pioneer2dx</uri>
      <plugin name="DiffDrivePlugin" filename="build/libDiffDrivePlugin.so"/>
    </include>
  </world>
</sdf>