Acceptance test for fixing rounding error on weight.

cms/djangoapps/contentstore/features/grading.feature

@@ -59,6 +59,17 @@ Feature: CMS.Course Grading
         And I go back to the main course page
         Then I do see the assignment name "New Type"
 
+    # Note that "7" is a special weight because it revealed rounding errors (STUD-826).
+    Scenario: Users can set weight to Assignment types
+        Given I have opened a new course in Studio
+        And I am viewing the grading settings
+        When I add a new assignment type "New Type"
+        And I set the assignment weight to "7"
+        And I press the "Save" notification button
+        Then the assignment weight is displayed as "7"
+        And I reload the page
+        Then the assignment weight is displayed as "7"
+
     Scenario: Settings are only persisted when saved
         Given I have opened a new course in Studio
         And I have populated the course

cms/djangoapps/contentstore/features/grading.py

@@ -106,6 +106,22 @@ def add_assignment_type(step, new_name):
     new_assignment._element.send_keys(new_name)
 
 
+@step(u'I set the assignment weight to "([^"]*)"$')
+def set_weight(step, weight):
+    weight_id = '#course-grading-assignment-gradeweight'
+    weight_field = world.css_find(weight_id)[-1]
+    old_weight = world.css_value(weight_id, -1)
+    for count in range(len(old_weight)):
+        weight_field._element.send_keys(Keys.END, Keys.BACK_SPACE)
+    weight_field._element.send_keys(weight)
+
+
+@step(u'the assignment weight is displayed as "([^"]*)"$')
+def verify_weight(step, weight):
+    weight_id = '#course-grading-assignment-gradeweight'
+    assert_equal(world.css_value(weight_id, -1), weight)
+
+
 @step(u'I have populated the course')
 def populate_course(step):
     step.given('I have added a new section')

cms/static/js/models/settings/course_grading_policy.js

@@ -17,7 +17,7 @@ var CourseGradingPolicy = Backbone.Model.extend({
             // interesting race condition: if {parse:true} when newing, then parse called before .attributes created
             if (this.attributes && this.has('graders')) {
                 graderCollection = this.get('graders');
-                graderCollection.reset(attributes.graders);
+                graderCollection.reset(attributes.graders, {parse:true});
             }
             else {
                 graderCollection = new CourseGraderCollection(attributes.graders, {parse:true});