Fixed tests

app/assets/javascripts/merge_request_tabs.js

@@ -369,18 +369,21 @@
     };
 
     MergeRequestTabs.prototype.initAffix = function () {
+      var $tabs = $('.js-tabs-affix');
+
       // Screen space on small screens is usually very sparse
       // So we dont affix the tabs on these
-      if (Breakpoints.get().getBreakpointSize() === 'xs') return;
+      if (Breakpoints.get().getBreakpointSize() === 'xs' || !$tabs.length) return;
 
-      var $tabs = $('.js-tabs-affix'),
-          tabsWidth = $tabs.outerWidth(),
-          $diffTabs = $('#diff-notes-app'),
-          offsetTop = $tabs.offset().top - ($('.navbar-fixed-top').height() + $('.layout-nav').height());
+      var tabsWidth = $tabs.outerWidth(),
+        $diffTabs = $('#diff-notes-app'),
+        offsetTop = $tabs.offset().top - ($('.navbar-fixed-top').height() + $('.layout-nav').height());
 
       $tabs.off('affix.bs.affix affix-top.bs.affix')
         .affix({
-          offset: offsetTop
+          offset: {
+            top: offsetTop
+          }
         }).on('affix.bs.affix', function () {
           $tabs.css({
             left: $tabs.offset().left,

spec/features/merge_requests/sticky_tabs_spec.rb

 require 'spec_helper'
 
 feature 'Merge request tabs', js: true, feature: true do
+  include WaitForAjax
+
   let(:user)          { create(:user) }
   let(:project)       { create(:project, :public) }
   let(:merge_request) { create(:merge_request_with_diffs, source_project: project, author: user, title: "Bug NS-04") }
@@ -9,18 +11,20 @@ feature 'Merge request tabs', js: true, feature: true do
     project.team << [user, :master]
     login_as user
     visit diffs_namespace_project_merge_request_path(project.namespace, project, merge_request)
+
+    wait_for_ajax
   end
 
   it 'affixes to top of page when scrolling' do
-    page.execute_script "window.scrollBy(0,10000)"
+    page.execute_script "window.scroll(0,10000)"
     expect(page).to have_selector('.js-tabs-affix.affix')
   end
 
   it 'removes affix when scrolling to top' do
-    page.execute_script "window.scrollBy(0,10000)"
+    page.execute_script "window.scroll(0,10000)"
     expect(page).to have_selector('.js-tabs-affix.affix')
 
-    page.execute_script "window.scrollBy(0,-10000)"
+    page.execute_script "window.scroll(0,-10000)"
     expect(page).to have_selector('.js-tabs-affix.affix-top')
   end
 end