load_schema_if_pending!

# File activerecord/lib/active_record/migration.rb, line 714
      def load_schema_if_pending!
        if any_schema_needs_update?
          # Roundtrip to Rake to allow plugins to hook into database initialization.
          root = defined?(ENGINE_ROOT) ? ENGINE_ROOT : Rails.root

          FileUtils.cd(root) do
            Base.connection_handler.clear_all_connections!(:all)
            system("bin/rails db:test:prepare")
          end
        end

        check_pending_migrations
      end