ruby-on-rails - DatabaseCleaner は、Rails テスト ユニットで自動インクリメント インデックスをリセットしません。

Question

test/test_helper.rb :

ENV["RAILS_ENV"] ||= "test"
require File.expand_path('../../config/environment', __FILE__)
require 'rails/test_help'
require 'database_cleaner'

DatabaseCleaner.strategy = :transaction
DatabaseCleaner.clean_with(:truncation, pre_count: true, reset_ids: true)

class ActiveSupport::TestCase
  ActiveRecord::Migration.check_pending!


  def setup
    DatabaseCleaner.start
  end


  def teardown
    DatabaseCleaner.clean
    p '-------- DB Cleaned ---------'
  end

end

私のテストユニットファイル: (test1 と 2 は重複しています)

require 'test_helper'

class ItemTest < ActiveSupport::TestCase

  test "test1" do
    i = Item.create!

    p ActiveRecord::Base.connection.execute("SELECT auto_increment FROM information_schema.tables WHERE table_schema = 'tmi_game_test' AND table_name = 'items';").first

    assert_equal 1, Item.count
    assert_equal 1, i.id
  end

  test "test2" do
    i = Item.create!

    p ActiveRecord::Base.connection.execute("SELECT auto_increment FROM information_schema.tables WHERE table_schema = 'tmi_game_test' AND table_name = 'items';").first

    assert_equal 1, Item.count
    assert_equal 1, i.id
  end

end

結果 ：

# Running:

[2]
"-------- DB Cleaned ---------"
.[3]
"-------- DB Cleaned ---------"
F

Finished in 0.142886s, 13.9972 runs/s, 27.9944 assertions/s.

  1) Failure:
ItemTest#test_test2 [test/models/item_test.rb:45]:
Expected: 1
  Actual: 2

2 runs, 4 assertions, 1 failures, 0 errors, 0 skips

なぜ機能しないのですか？私の間違いはどこですか？