code: def test_volume_lookup_table(vol_prop, skip_check_gc):
      lut = pv.LookupTable(cmap="bwr")
      lut.apply_opacity([1.0, 0.0, 0.0, 0.3, 0.0, 0.0, 0.0, 0.3])
      orig = vol_prop.GetRGBTransferFunction()
      vol_prop.apply_lookup_table(lut)
      assert vol_prop.GetRGBTransferFunction() is not orig
  
file_path: pyvista/tests/plotting/test_volume_property.py
imports: import pytest
  import pyvista
  from pyvista.plotting.volume_property import VolumeProperty
label_desc: Use image node_id 2 for calling a global function with example usage: test_volume_lookup_table(vol_prop, skip_check_gc) without return types