1 files changed, 28 insertions, 0 deletions
diff --git a/tests/test_writer_latex.py b/tests/test_writer_latex.py
new file mode 100644
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+++ b/tests/test_writer_latex.py
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+"""Test the LaTeX writer"""
+
+import pytest
+
+from sphinx.writers.latex import rstdim_to_latexdim
+
+
+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'