mediawiki-extensions-RevisionSlider/tests/browser/features/support/step_definitions/timeline.rb

Then(/^The forward arrow should be disabled/) do
  expect(on(DiffPage).revisionslider_timeline_forwards_disabled_element).to be_visible
  end

Then(/^The backward arrow should be disabled/) do
  expect(on(DiffPage).revisionslider_timeline_backwards_disabled_element).to be_visible
end

Then(/^The forward arrow should be enabled/) do
  expect(on(DiffPage).revisionslider_timeline_forwards_element).to be_visible
end

Then(/^The backward arrow should be enabled/) do
  expect(on(DiffPage).revisionslider_timeline_backwards_element).to be_visible
end

Given(/^I click on the forward arrow$/) do
  on(DiffPage).revisionslider_timeline_forwards_element.when_visible.click
end

Given(/^I click on the backward arrow$/) do
  on(DiffPage).revisionslider_timeline_backwards_element.when_visible.click
end