rails--rails/activerecord/test/cases/custom_locking_test.rb

require "cases/helper"
require "models/person"

module ActiveRecord
  class CustomLockingTest < ActiveRecord::TestCase
    fixtures :people

    def test_custom_lock
      if current_adapter?(:Mysql2Adapter)
        assert_match "SHARE MODE", Person.lock("LOCK IN SHARE MODE").to_sql
        assert_sql(/LOCK IN SHARE MODE/) do
          Person.all.merge!(lock: "LOCK IN SHARE MODE").find(1)
        end
      end
    end
  end
end