add selenium test for error CR error UI

flag = conditional_release
Closes LS-1310

Test Plan: passes jenkins

Change-Id: I931210a72db755a2e59f65dc554ae867c7ee1a1a
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/246112
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: James Williams <jamesw@instructure.com>
QA-Review: Robin Kuss <rkuss@instructure.com>
Product-Review: Robin Kuss <rkuss@instructure.com>

spec/selenium/conditional_release/conditional_release_spec.rb

@@ -180,6 +180,18 @@ describe 'native canvas conditional release' do
 
       expect(ConditionalReleaseObjects.assignment_exists_in_scoring_range?(1,assignment_for_mp.title)).to be(true)
     end
+
+    it 'should be able see errors for invalid scoring ranges' do
+      assignment = assignment_model(course: @course, points_possible: 100)
+      get "/courses/#{@course.id}/assignments/#{assignment.id}/edit"
+      ConditionalReleaseObjects.conditional_release_link.click
+
+      replace_content(ConditionalReleaseObjects.division_cutoff1, "")
+      expect(ConditionalReleaseObjects.must_not_be_empty_exists?).to eq(true)
+
+      replace_content(ConditionalReleaseObjects.division_cutoff1, "35")
+      expect(ConditionalReleaseObjects.these_scores_are_out_of_order_exists?).to eq(true)
+    end
   end
 
   context 'Mastery Path Breakdowns' do

spec/selenium/conditional_release/page_objects/conditional_release_objects.rb

@@ -76,6 +76,14 @@ class ConditionalReleaseObjects
       f("[title='Division cutoff 2']")
     end
 
+    def must_not_be_empty_exists?
+      element_exists?("//*[contains(@id,'error') and contains(text(),'must not be empty')]", true)
+    end
+
+    def these_scores_are_out_of_order_exists?
+      element_exists?("//*[contains(@id,'error') and contains(text(),'these scores are out of order')]", true)
+    end
+
     # Common Selectors
     def conditional_release_link
       f("#conditional_release_link")