Specs for cleanup workers (#3235)

* Add spec files for feed and media cleanup workers

* Add coverage for feed and media cleanup schedulers

* Clean up feed and media cleanup workers

spec/workers/scheduler/media_cleanup_scheduler_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+describe Scheduler::MediaCleanupScheduler do
+  subject { described_class.new }
+
+  let!(:old_media) { Fabricate(:media_attachment, account_id: nil, created_at: 10.days.ago) }
+  let!(:new_media) { Fabricate(:media_attachment, account_id: nil, created_at: 1.hour.ago) }
+
+  it 'removes old media records' do
+    subject.perform
+
+    expect { old_media.reload }.to raise_error(ActiveRecord::RecordNotFound)
+    expect(new_media.reload).to be_persisted
+  end
+end