spec: add test for alt text added from image options tray

Change-Id: I242c8b1be8578c6b45567176c54af48853894841
refs: CORE-2653
Reviewed-on: https://gerrit.instructure.com/194919
Tested-by: Jenkins
Reviewed-by: Robert Lamb <rlamb@instructure.com>
QA-Review: Jeremy Putnam <jeremyp@instructure.com>
Product-Review: Jeremy Putnam <jeremyp@instructure.com>

spec/selenium/rcs/pages/rce_next_page.rb

@@ -234,6 +234,10 @@ module RCENextPage
 
   end
 
+  def alt_text_textbox
+    f('textarea[aria-describedby="alt-text-label-tooltip"]')
+  end
+
   # ---------------------- Actions ----------------------
 
   def click_pages_accordion

spec/selenium/rcs/rce_next_spec.rb

@@ -315,6 +315,24 @@ describe "RCE next tests" do
       end
     end
 
+    it "should add alt text to image using options tray" do
+      alt_text = "fear is the mindkiller"
+      page_title = "Page1"
+      create_wiki_page_with_embedded_image(page_title)
+
+      visit_existing_wiki_edit(@course, page_title)
+
+      click_embedded_image_for_options
+      click_image_options_button
+
+      alt_text_textbox.send_keys(alt_text)
+      click_image_options_done_button
+
+      in_frame rce_page_body_ifr_id do
+        expect(wiki_body_image.attribute('alt')).to include alt_text
+      end
+    end
+
     it "should display assignment publish status in links accordion" do
       skip('Unskip in CORE-2619')
       title = "Assignment-Title"