invitations_spec.rb

          it 'creates a participant after clicking `confirm' do
            load_page
            click_on '10:00 am'

            # Not sure why the ActiveRecord connection is becoming
            # stale...probably something to do with the way capybara runs tests
            # with selenium.
            #
            # Symptom that led to the change:
            # Running this in isolation without refreshing the connection would
            # yield a passing test. Running it with errbody else caused it to
            # fail. When I changed Participant.count to something like:
            #
            #     ActiveRecord::Base.connection.execute('select count(*) from participants').first["count"].to_i
            #
            # ...the test passed when ran with all other tests, so this led me
            # to believe the connection was becoming stale. Re-establishing the
            # connection fixes the problem.
            expect {
              click_on 'Confirm'
            }.to change { ActiveRecord::Base.establish_connection; Participant.count }.by(1)
          end