ruby-on-rails – 如何从性能测试开始

>模拟100个用户同时登录和注销
>模拟100个用户同时添加新兴趣.

我已经通过以下链接：

http://rubylearning.com/blog/2011/08/14/performance-testing-rails-applications-how-to/

http://guides.rubyonrails.org/performance_testing.html

并且能够做以下事情

>使用test_helper.rb创建测试文件夹
>创建了test / performance / login_test.rb
>创建fixtures / users.yml

test_helper.rb中

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

class ActiveSupport::TestCase
  # Setup all fixtures in test/fixtures/*.(yml|csv) for all tests in alphabetical order.
  #
  # Note: You'll currently still have to declare fixtures explicitly in integration tests
  # -- they do not yet inherit this setting
  fixtures :all

  # Add more helper methods to be used by all tests here...
end

/performance/login_test.rb

require 'test_helper'
require 'rails/performance_test_help'

class LoginTest < ActionDispatch::PerformanceTest

  fixtures :users
  # Refer to the documentation for all available options
   self.profile_options = { :runs => 5,:metrics => [:wall_time,:memory],:output => 'tmp/performance',:formats => [:flat] }

  def test_login
   post_via_redirect "http://bc.lvh.me/",:username => users(:youruser).username,:password => users(:youruser).password
#using lvh.me coz login page is on my subdomain
  end
end

灯具/ users.yml里

one:
  username: eagleschasar12
  password: chaitanyA1#

two:
  username: eaglesmarktell12
  password: chaitanyA1#

当我运行rake test：profile时,我得到了以下结果

E
===============================================================================
Error: test_login(LoginTest)
ActiveRecord::StatementInvalid: SQLite3::SQLException: table users has no column named password: INSERT INTO "users" ("username","password","created_at","updated_at","id") VALUES ('eagleschasar12','chaitanyA1#','2012-06-15 06:43:01',980190962)

所以我的问题是

>为什么测试命令触发插入查询？
>我是否需要在夹具文件中编写100条用户记录来测试功能？
>如何检查会话登录/注销？
>此外,当我从db中选择兴趣类型时,我的用户应该登录系统,那么我如何在性能测试中测试这种情况？
>此测试是否在webrick上运行,webrick是我的本地服务器.