Unit test for video xml parsing

handling unknown xml attrs.

common/lib/xmodule/xmodule/tests/xml/test_inheritance.py

 """
 Test that inherited fields work correctly when parsing XML
 """
-from nose.tools import assert_equals  # pylint: disable=no-name-in-module
+from nose.tools import assert_equals, assert_in  # pylint: disable=no-name-in-module
 
 from xmodule.tests.xml import XModuleXmlImportTest
-from xmodule.tests.xml.factories import CourseFactory, SequenceFactory, ProblemFactory
+from xmodule.tests.xml.factories import CourseFactory, SequenceFactory, ProblemFactory, XmlImportFactory
 
 
 class TestInheritedFieldParsing(XModuleXmlImportTest):
@@ -27,3 +27,21 @@ class TestInheritedFieldParsing(XModuleXmlImportTest):
 
         problem = sequence.get_children()[0]
         assert_equals(None, problem.days_early_for_beta)
+
+    def test_video_attr(self):
+        """
+        Test that video's definition_from_xml handles unknown attrs w/o choking
+        """
+        # Fixes LMS-11491
+        root = CourseFactory.build()
+        sequence = SequenceFactory.build(parent=root)
+        video = XmlImportFactory(
+            parent=sequence,
+            tag='video',
+            attribs={
+                'parent_sequential_url': 'foo', 'garbage': 'asdlk',
+                'download_video': 'true',
+            }
+        )
+        video_block = self.process_xml(video)
+        assert_in('garbage', video_block.xml_attributes)