黄瓜不一致的行为

Question

我正在尝试运行测试功能。“捆绑exec黄瓜功能”启动失败异常（在登录期间），它无法识别现有用户。如果我运行单个功能文件它工作正常。我做错了什么？

宝石文件：

group :test do
  gem 'ruby-prof'
  gem 'cucumber-rails', :require => false
  gem 'cucumber'
  gem 'spork'
  gem 'launchy'
  gem 'capybara'
  gem 'selenium-webdriver'
  gem 'selenium-client'
  gem 'database_cleaner'
  gem 'email_spec', :branch=>'rails3'
end

在env.rb中

begin
  DatabaseCleaner.strategy = :transaction
rescue NameError
  raise "You need to add database_cleaner to your Gemfile (in the :test group) if you wish to use it."
end