code: def test_attr_repr(block_attr):
      block_attr.visible = True
      block_attr.opacity = 0.9
      block_attr.color = "blue"
      block_attr.pickable = False
  
      repr_ = repr(block_attr)
      assert "True" in repr_
      assert "False" in repr_
      assert "blue" in repr_
      assert "0.9" in repr_
  
imports: import pytest
  from vtkmodules.vtkCommonCore import vtkLookupTable
  import pyvista
  from pyvista.plotting.composite_mapper import BlockAttributes, CompositePolyDataMapper
label_desc: Use image node_id 17 for calling a global function with example usage: test_attr_repr(block_attr) without return types