code: def test_rstdim_to_latexdim():
      # Length units docutils supported
      # https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#length-units
      assert rstdim_to_latexdim("160em") == "160em"
      assert rstdim_to_latexdim("160px") == "160\\sphinxpxdimen"
      assert rstdim_to_latexdim("160in") == "160in"
      assert rstdim_to_latexdim("160cm") == "160cm"
      assert rstdim_to_latexdim("160mm") == "160mm"
      assert rstdim_to_latexdim("160pt") == "160bp"
      assert rstdim_to_latexdim("160pc") == "160pc"
      assert rstdim_to_latexdim("30%") == "0.300\\linewidth"
      assert rstdim_to_latexdim("160") == "160\\sphinxpxdimen"
  
      # float values
      assert rstdim_to_latexdim("160.0em") == "160.0em"
      assert rstdim_to_latexdim(".5em") == ".5em"
  
      # unknown values (it might be generated by 3rd party extension)
      with pytest.raises(
          ValueError, match="could not convert string to float: "
      ):
          rstdim_to_latexdim("unknown")
      assert rstdim_to_latexdim("160.0unknown") == "160.0unknown"
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_rstdim_to_latexdim() without return types