Don't monkey patch ActiveSupport.

It could have side effects (for example, a conflict after upgrading to
Rails 5).

Thanks @aitbw for the suggestion!

spec/features/officing/results_spec.rb

@@ -1,10 +1,9 @@
 require 'rails_helper'
-require 'time_helper'
 
 feature 'Officing Results' do
 
   background do
-    freeze_time
+    travel_to Time.now # TODO: use `freeze_time` after migrating to Rails 5.
     @poll_officer = create(:poll_officer)
     @officer_assignment = create(:poll_officer_assignment, :final, officer: @poll_officer)
     @poll = @officer_assignment.booth_assignment.poll

spec/spec_helper.rb

@@ -18,6 +18,7 @@ RSpec.configure do |config|
   config.include(EmailSpec::Helpers)
   config.include(EmailSpec::Matchers)
   config.include(CommonActions)
+  config.include(ActiveSupport::Testing::TimeHelpers)
   config.before(:suite) do
     DatabaseCleaner.clean_with :truncation
   end

spec/time_helper.rb

@@ -1,8 +0,0 @@
-module ActiveSupport::Testing::TimeHelpers
-  # Copied from Rails 5.2. TODO: remove after migrating to Rails 5.
-  def freeze_time(&block)
-    travel_to Time.now, &block
-  end
-end
-
-include ActiveSupport::Testing::TimeHelpers