text: """
      test_writer_latex
      ~~~~~~~~~~~~~~~~
  
      Test the LaTeX writer
  
      :copyright: Copyright 2007-2019 by the Sphinx team, see AUTHORS.
      :license: BSD, see LICENSE for details.
  """
  
  import pytest
  
  from sphinx.writers.latex import rstdim_to_latexdim
  
  
  def test_rstdim_to_latexdim():
      # Length units docutils supported
      # http://docutils.sourceforge.net/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):
          rstdim_to_latexdim('unknown')
      assert rstdim_to_latexdim('160.0unknown') == '160.0unknown'
  