PG::ConnectionBad: connection is closed after upgrading to rails 5.2

[asnad]

I have update rails version of my project form 4.2 to 5.2. Now I am getting following error on some of my tests randomly.
Counters::DefectDistributionContext execute group by defect should group counters by defect Failure/Error: DatabaseCleaner[:active_record].clean_with(:truncation)

   `ActiveRecord::StatementInvalid:
     PG::ConnectionBad: connection is closed: TRUNCATE TABLE "public"."alerts", "public"."gv_sub_equipments", "public"."machine_part_changes", "public"."settings", "public"."article_attachments", "public"."systematic_reject_machines", "public"."furnaces", "public"."attachments", "public"."defect_translations", "public"."gv_equipment_families", "public"."gv_equipments", "public"."gv_squads", "public"."article_check_specification_tolerances", "public"."gv_area_equipments", "public"."gv_areas", "public"."machine_downtimes", "public"."machine_groups", "public"."article_machine_part_settings", "public"."checks", "public"."comments", "public"."counters", "public"."customers", "public"."defect_groups", "public"."defects", "public"."delayed_jobs", "public"."job_specifications", "public"."machine_part_change_reasons", "public"."machine_part_translations", "public"."machine_parts", "public"."machine_type_group_machine_types", "public"."machine_type_groups", "public"."machine_types", "public"."messages", "public"."check_specification_priorities", "public"."check_specification_responsibility_areas", "public"."responsibility_areas", "public"."check_specification_machine_types", "public"."gv_components", "public"."gv_entries", "public"."gv_stop_reasons", "public"."gv_sub_equipment_components", "public"."jobs", "public"."lab_recipe_versions", "public"."lab_recipes", "public"."lines", "public"."mold_sets", "public"."check_groups", "public"."check_specifications", "public"."articles", "public"."packing_schemes", "public"."rails_admin_settings", "public"."check_batches", "public"."reasons", "public"."rejects", "public"."roles", "public"."shift_definitions", "public"."shifts", "public"."system_log_entries", "public"."task_status_changes", "public"."tasks", "public"."tresholds", "public"."user_responsibility_areas", "public"."users", "public"."users_roles", "public"."workstations", "public"."machines", "public"."systematic_rejects" RESTART IDENTITY CASCADE`

What should I do to fix this?

[Dantemss]

Well try setting reaping_frequency: 0 for the test DB in database.yml (DON'T do this for Rails < 5.2 or you will see very degraded performance due to the reaper running in a loop). I had a similar issue in Rails 5.2 that was solved by changing that setting (records would disappear in the middle of a running example).

[smoyte]

@Dantemss Thank you so much for this fix! Saved my life!