refactor: avoid parsing document twice for figure numbers

test/test_formula.py

@@ -1,7 +1,6 @@
 import pytest
-from mistletoe import Document
 
-from renderer.fifty_ohm_html_renderer import FiftyOhmHtmlRenderer
+from test.util import render_html
 
 
 @pytest.mark.html
@@ -14,6 +13,5 @@ def test_formula_html():
         r"Lorem Ipsum" + "\n" + r"$a \cdot b$": "<p>Lorem Ipsum</p>\n\n" + r"$$a \cdot b$$" + "\n\n",
     }
 
-    with FiftyOhmHtmlRenderer() as renderer:
-        for assertion in assertions:
-            assert renderer.render(Document(assertion)) == assertions[assertion]
+    for assertion in assertions:
+        assert render_html(assertion) == assertions[assertion]