Hide After Due setting for Timed Exams

TNL-4366
Changes in studio to allow the hide_after_due setting to be utilized.

Includes:
    -python changes to contentstore, where the data is stored.
    -refactoring of timed-examination-preference-editor.underscore, to add this
        setting and make the editor more accessible.
    -javascript changes to link the new setting to the correct data model.
    -sass updates to fix a11y issues on the editor modal.
    -addition of post-due visibility information to course outline in studio.
    -new tests: python, js, acceptance, and a11y

cms/djangoapps/contentstore/proctoring.py

@@ -83,7 +83,8 @@ def register_special_exams(course_key):
                 due_date=timed_exam.due,
                 is_proctored=timed_exam.is_proctored_exam,
                 is_practice_exam=timed_exam.is_practice_exam,
-                is_active=True
+                is_active=True,
+                hide_after_due=timed_exam.hide_after_due,
             )
             msg = 'Updated timed exam {exam_id}'.format(exam_id=exam['id'])
             log.info(msg)
@@ -97,7 +98,8 @@ def register_special_exams(course_key):
                 due_date=timed_exam.due,
                 is_proctored=timed_exam.is_proctored_exam,
                 is_practice_exam=timed_exam.is_practice_exam,
-                is_active=True
+                is_active=True,
+                hide_after_due=timed_exam.hide_after_due,
             )
             msg = 'Created new timed exam {exam_id}'.format(exam_id=exam_id)
             log.info(msg)

cms/djangoapps/contentstore/tests/test_proctoring.py

@@ -53,6 +53,10 @@ class TestProctoredExams(ModuleStoreTestCase):
             exam_review_policy = get_review_policy_by_exam_id(exam['id'])
             self.assertEqual(exam_review_policy['review_policy'], sequence.exam_review_rules)
 
+        if not exam['is_proctored'] and not exam['is_practice_exam']:
+            # the hide after due value only applies to timed exams
+            self.assertEqual(exam['hide_after_due'], sequence.hide_after_due)
+
         self.assertEqual(exam['course_id'], unicode(self.course.id))
         self.assertEqual(exam['content_id'], unicode(sequence.location))
         self.assertEqual(exam['exam_name'], sequence.display_name)
@@ -62,13 +66,14 @@ class TestProctoredExams(ModuleStoreTestCase):
         self.assertEqual(exam['is_active'], expected_active)
 
     @ddt.data(
-        (True, 10, True, False, True, False),
-        (True, 10, False, False, True, False),
-        (True, 10, True, True, True, True),
+        (True, 10, True, False, True, False, False),
+        (True, 10, False, False, True, False, False),
+        (True, 10, False, False, True, False, True),
+        (True, 10, True, True, True, True, False),
     )
     @ddt.unpack
-    def test_publishing_exam(self, is_time_limited, default_time_limit_minutes,
-                             is_proctored_exam, is_practice_exam, expected_active, republish):
+    def test_publishing_exam(self, is_time_limited, default_time_limit_minutes, is_proctored_exam,
+                             is_practice_exam, expected_active, republish, hide_after_due):
         """
         Happy path testing to see that when a course is published which contains
         a proctored exam, it will also put an entry into the exam tables
@@ -85,7 +90,8 @@ class TestProctoredExams(ModuleStoreTestCase):
             is_proctored_exam=is_proctored_exam,
             is_practice_exam=is_practice_exam,
             due=datetime.now(UTC) + timedelta(minutes=default_time_limit_minutes + 1),
-            exam_review_rules="allow_use_of_paper"
+            exam_review_rules="allow_use_of_paper",
+            hide_after_due=hide_after_due,
         )
 
         listen_for_course_publish(self, self.course.id)
@@ -117,7 +123,8 @@ class TestProctoredExams(ModuleStoreTestCase):
             graded=True,
             is_time_limited=True,
             default_time_limit_minutes=10,
-            is_proctored_exam=True
+            is_proctored_exam=True,
+            hide_after_due=False,
         )
 
         listen_for_course_publish(self, self.course.id)
@@ -147,7 +154,8 @@ class TestProctoredExams(ModuleStoreTestCase):
             graded=True,
             is_time_limited=True,
             default_time_limit_minutes=10,
-            is_proctored_exam=True
+            is_proctored_exam=True,
+            hide_after_due=False,
         )
 
         listen_for_course_publish(self, self.course.id)
@@ -182,7 +190,8 @@ class TestProctoredExams(ModuleStoreTestCase):
             graded=True,
             is_time_limited=True,
             default_time_limit_minutes=10,
-            is_proctored_exam=True
+            is_proctored_exam=True,
+            hide_after_due=False,
         )
 
         listen_for_course_publish(self, self.course.id)
@@ -218,7 +227,8 @@ class TestProctoredExams(ModuleStoreTestCase):
             is_time_limited=True,
             default_time_limit_minutes=10,
             is_proctored_exam=True,
-            exam_review_rules="allow_use_of_paper"
+            exam_review_rules="allow_use_of_paper",
+            hide_after_due=False,
         )
 
         listen_for_course_publish(self, self.course.id)

cms/djangoapps/contentstore/views/item.py

@@ -935,7 +935,8 @@ def create_xblock_info(xblock, data=None, metadata=None, include_ancestor_info=F
                 "is_practice_exam": xblock.is_practice_exam,
                 "is_time_limited": xblock.is_time_limited,
                 "exam_review_rules": xblock.exam_review_rules,
-                "default_time_limit_minutes": xblock.default_time_limit_minutes
+                "default_time_limit_minutes": xblock.default_time_limit_minutes,
+                "hide_after_due": xblock.hide_after_due,
             })
 
     # Update with gating info