Add spec for closing revert modal on escape keypress

spec/features/user_sees_revert_modal_spec.rb

+require 'rails_helper'
+
+describe 'Merge request > User sees Revert modal', :js do
+  let(:project) { create(:project, :public, :repository) }
+  let(:user) { project.creator }
+  let(:merge_request) { create(:merge_request, source_project: project) }
+
+  before do
+    sign_in(user)
+    visit project_merge_request_path(project, merge_request)
+    click_button('Merge')
+    visit(merge_request_path(merge_request))
+    click_link('Revert')
+  end
+
+  it 'shows the revert modal' do
+    expect(page).to have_content('Revert this merge request')
+  end
+
+  it 'closes the revert modal with escape keypress' do
+    find('#modal-revert-commit').send_keys(:escape)
+
+    expect(page).not_to have_content('Revert this merge request')
+  end
+end