Add unit-test for get_link_transform API.

tests/curobo_robot_world_model_test.py

@@ -134,3 +134,9 @@ def test_cu_robot_batch_world_collision():
     )
     assert d_world.shape[0] == b
     assert torch.sum(d_world) == 0.0
+
+def test_cu_robot_get_link_transform():
+    model = load_robot_world()
+    world_T_panda_hand = model.kinematics.get_link_transform("panda_hand")
+    # It seems the panda hand is initialized at the origin.
+    assert torch.sum(world_T_panda_hand.position) == 0.0