database-cleaner - Database_cleaner 问题。不工作

Question

我的 test_helper：

require "simplecov"
SimpleCov.start do
  add_filter "/factories/"
end

ENV['RAILS_ENV'] ||= 'test'

require File.expand_path('../../config/environment', __FILE__)
require 'rails/test_help'
require 'capybara/rails'
require 'mocha/mini_test'
require 'minitest/pride'
require 'factory_girl_rails'
require 'support/factory_girl'
require 'database_cleaner'

DatabaseCleaner.strategy = :transaction

class ActiveSupport::TestCase
  include FactoryGirl::Syntax::Methods
  # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
  fixtures :all

  # Add more helper methods to be used by all tests here...
  def setup
    DatabaseCleaner.start
  end

  def teardown
    DatabaseCleaner.clean
  end
end

class ActionDispatch::IntegrationTest
  include FactoryGirl::Syntax::Methods

  def setup
    DatabaseCleaner.start
  end

  def teardown
    reset_session!
    DatabaseCleaner.clean
  end

end

我的宝石文件：

group :development, :test do
gem 'database_cleaner',       '~> 1.4.0'

我究竟做错了什么？我正在运行我的测试，而我的单元和集成测试并没有像他们应该的那样独立运行。我应该怎么办？我错过了什么？

我尝试查找解决方案，但注意到似乎有效。我错过了什么？