code: def test_property_diffuse_color(prop):
      prop.diffuse_color = "b"
      assert prop.diffuse_color.float_rgb == (0, 0, 1)
  
imports: import pytest
  import pyvista
  from pyvista.plotting._property import _check_range
label_desc: Use image node_id 22 for calling a global function with example usage: test_property_diffuse_color(prop) without return types