Flaky test ee/spec/features/epic_boards/epic_boards_sidebar_spec.rb:185 # Epic boards sidebar in notifications subscription shows toggle as on then as off as user toggles to subscribe and unsubscribe

Job #1218355725 failed for 67d691ac:

  1) Epic boards sidebar in notifications subscription shows toggle as on then as off as user toggles to subscribe and unsubscribe
     Failure/Error: expect(page).to have_button('Notifications', class: 'is-checked')
       expected to find button "Notifications" with classes [is-checked] that is not disabled but there were no matches
     # ./ee/spec/features/epic_boards/epic_boards_sidebar_spec.rb:190:in `block (3 levels) in <top (required)>'
     # ./spec/spec_helper.rb:355:in `block (3 levels) in <top (required)>'
     # ./spec/support/sidekiq_middleware.rb:9:in `with_sidekiq_server_middleware'
     # ./spec/spec_helper.rb:346:in `block (2 levels) in <top (required)>'
     # ./spec/spec_helper.rb:342:in `block (3 levels) in <top (required)>'
     # ./lib/gitlab/application_context.rb:31:in `with_raw_context'
     # ./spec/spec_helper.rb:342:in `block (2 levels) in <top (required)>'
Finished in 14 minutes 34 seconds (files took 53.01 seconds to load)
311 examples, 1 failure, 6 pending
Failed examples:
rspec ./ee/spec/features/epic_boards/epic_boards_sidebar_spec.rb:185 # Epic boards sidebar in notifications subscription shows toggle as on then as off as user toggles to subscribe and unsubscribe