imgmath: add test for embed+parallel

tests/test_ext_math.py

@@ -74,6 +74,25 @@ def test_imgmath_svg_embed(app, status, warning):
     assert re.search(html, content, re.DOTALL)
 
 
+@pytest.mark.skipif(not has_binary('dvisvgm'),
+                    reason='Requires dvisvgm" binary')
+@pytest.mark.sphinx('html', testroot='ext-math',
+                    confoverrides={'extensions': ['sphinx.ext.imgmath'],
+                                   'imgmath_image_format': 'svg',
+                                   'imgmath_embed': True},
+                    parallel=2)
+def test_imgmath_svg_embed_parallel(app, status, warning):
+    app.builder.build_all()
+    if "LaTeX command 'latex' cannot be run" in warning.getvalue():
+        pytest.skip('LaTeX command "latex" is not available')
+    if "dvisvgm command 'dvisvgm' cannot be run" in warning.getvalue():
+        pytest.skip('dvisvgm command "dvisvgm" is not available')
+
+    content = (app.outdir / 'index.html').read_text(encoding='utf8')
+    html = r'<img src="data:image/svg\+xml;base64,[\w\+/=]+"'
+    assert re.search(html, content, re.DOTALL)
+
+
 @pytest.mark.sphinx('html', testroot='ext-math',
                     confoverrides={'extensions': ['sphinx.ext.mathjax'],
                                    'mathjax_options': {'integrity': 'sha384-0123456789'}})