From bcb2038843f5e30c6a8f3c63f4a241e7477814f5 Mon Sep 17 00:00:00 2001
From: Awais Jibran <awaisdar001@gmail.com>
Date: Mon, 3 Feb 2020 14:55:03 +0500
Subject: [PATCH] Fix CAPA Problems

---
 common/lib/capa/capa/capa_problem.py            |  1 +
 common/lib/capa/capa/tests/test_capa_problem.py | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/common/lib/capa/capa/capa_problem.py b/common/lib/capa/capa/capa_problem.py
index 5f44750ccb..6d9f2fd2cf 100644
--- a/common/lib/capa/capa/capa_problem.py
+++ b/common/lib/capa/capa/capa_problem.py
@@ -64,6 +64,7 @@ html_transforms = {
 
 # These should be removed from HTML output, including all subelements
 html_problem_semantics = [
+    "additional_answer",
     "codeparam",
     "responseparam",
     "answer",
diff --git a/common/lib/capa/capa/tests/test_capa_problem.py b/common/lib/capa/capa/tests/test_capa_problem.py
index 6c59985d32..5331096c6d 100644
--- a/common/lib/capa/capa/tests/test_capa_problem.py
+++ b/common/lib/capa/capa/tests/test_capa_problem.py
@@ -189,6 +189,23 @@ class CAPAProblemTest(unittest.TestCase):
             }
         )
 
+    def test_additional_answer_is_skipped_from_resulting_html(self):
+        """Tests that additional_answer element is not present in transformed HTML"""
+        xml = """
+        <problem>
+            <p>Be sure to check your spelling.</p>
+            <stringresponse answer="War" type="ci">
+                <label>___ requires sacrifices.</label>
+                <description>Anyone who looks the world as if it was a game of chess deserves to lose.</description>
+                <additional_answer answer="optional acceptable variant of the correct answer"/>
+                <textline size="40"/>
+            </stringresponse>
+        </problem>
+        """
+        problem = new_loncapa_problem(xml)
+        self.assertEqual(len(problem.extracted_tree.xpath('//additional_answer')), 0)
+        self.assertNotIn('additional_answer', problem.get_html())
+
     def test_non_accessible_inputtype(self):
         """
         Verify that tag with question text is not removed when inputtype is not fully accessible.