From fcd93ed6fdaf1a23cee5573f28dc5594549aa47f Mon Sep 17 00:00:00 2001
From: Richard Tibbles <richard@learningequality.org>
Date: Mon, 15 Sep 2025 16:05:47 -0700
Subject: [PATCH] Add regression test for and fix use of accent property for mo
 tag.

---
 .../contentcuration/tests/utils/test_markdown.py  | 15 +++++++++++++++
 .../utils/assessment/qti/mathml/core.py           |  1 +
 2 files changed, 16 insertions(+)

diff --git a/contentcuration/contentcuration/tests/utils/test_markdown.py b/contentcuration/contentcuration/tests/utils/test_markdown.py
index 9dc3cd41b6..c111146a85 100644
--- a/contentcuration/contentcuration/tests/utils/test_markdown.py
+++ b/contentcuration/contentcuration/tests/utils/test_markdown.py
@@ -166,6 +166,21 @@ def test_simple_block_math(self):
 
         self._assert_conversion(markdown_text, expected)
 
+    def test_mo_accented(self):
+        """Regression test for missed experimental property on mo tags"""
+
+        markdown_text = "$$a_b+\\overrightarrow{abc}+\\overleftarrow{abc}\\div\\surd\\overline{abc}$$"
+        expected = (
+            '<math display="block">'
+            "<semantics><mrow><msub><mi>a</mi><mi>b</mi></msub><mo>+</mo><mover><mrow><mi>a</mi><mi>b</mi><mi>c</mi></mrow><mo>→</mo></mover><mo>+</mo>"
+            '<mover><mrow><mi>a</mi><mi>b</mi><mi>c</mi></mrow><mo>←</mo></mover><mi>÷</mi><mo stretchy="false">√</mo><mover><mrow><mi>a</mi><mi>b</mi>'
+            '<mi>c</mi></mrow><mo accent="true">―</mo></mover></mrow>'
+            '<annotation encoding="application/x-tex">a_b+\\overrightarrow{abc}+\\overleftarrow{abc}\\div\\surd\\overline{abc}</annotation></semantics>'
+            "</math>"
+        )
+
+        self._assert_conversion(markdown_text, expected)
+
 
 class TestTexMathPlugin(TexMathTestMixin, unittest.TestCase):
     """Test direct markdown conversion: markdown → HTML+MathML"""
diff --git a/contentcuration/contentcuration/utils/assessment/qti/mathml/core.py b/contentcuration/contentcuration/utils/assessment/qti/mathml/core.py
index 7a038b9174..4bd3540fd0 100644
--- a/contentcuration/contentcuration/utils/assessment/qti/mathml/core.py
+++ b/contentcuration/contentcuration/utils/assessment/qti/mathml/core.py
@@ -45,6 +45,7 @@ class Mn(MathMLTokenElement):
 
 
 class Mo(MathMLTokenElement):
+    accent: Optional[bool] = None
     fence: Optional[bool] = None
     form: Optional[MathMLForm] = None
     largeop: Optional[bool] = None