Fix random failing test - delete attachment

Make sure we wait for AJAX request to finish before end test and cleanup
database
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/javascripts/notes.js.coffee

@@ -369,8 +369,8 @@ class @Notes
     note = $(this).closest(".note")
     note.find(".note-attachment").remove()
     note.find(".note-body > .note-text").show()
-    note.find(".js-note-attachment-delete").hide()
-    note.find(".note-edit-form").hide()
+    note.find(".note-header").show()
+    note.find(".current-note-edit-form").remove()
 
   ###
   Called when clicking on the "reply" button for a diff line.

spec/features/notes_on_merge_requests_spec.rb

@@ -2,6 +2,7 @@ require 'spec_helper'
 
 describe 'Comments', feature: true do
   include RepoHelpers
+  include WaitForAjax
 
   describe 'On a merge request', js: true, feature: true do
     let!(:merge_request) { create(:merge_request) }
@@ -123,8 +124,8 @@ describe 'Comments', feature: true do
         it 'removes the attachment div and resets the edit form' do
           find('.js-note-attachment-delete').click
           is_expected.not_to have_css('.note-attachment')
-          expect(find('.current-note-edit-form', visible: false)).
-            not_to be_visible
+          is_expected.not_to have_css('.current-note-edit-form')
+          wait_for_ajax
         end
       end
     end

spec/support/wait_for_ajax.rb

+module WaitForAjax
+  def wait_for_ajax
+    Timeout.timeout(Capybara.default_wait_time) do
+      loop until finished_all_ajax_requests?
+    end
+  end
+
+  def finished_all_ajax_requests?
+    page.evaluate_script('jQuery.active').zero?
+  end
+end