Under Rails 5.0.1, the Actions::Foreman::Report::Import.cleanup_after method fails to return the correct number of days and fails the existing unit test:

cleanup#test_0001_derive the number of dates based on Report::DEFAULT_EXPIRATION [test/unit/actions/report/import_test.rb:39]:
Expected: "7d" 
  Actual: "d"

The code attempts to do Hash[1.week.parts][:days], but the ActiveSupport::Duration#parts method isn't a very reliable API to determine days from a duration, as it depends on how the duration was constructed. Under Rails 4.2.7.1 it returns [[:days, 7]] but under Rails 5.0.1 it returns [[:weeks, 1]].

It should use division of durations or .to_i to be more reliable.