每天一剂Rails良药之Testing Across Multiple Controllers

Rails测试分三种:
1，关注于一个单独的Model的单元测试Unit test
2，关注于一个单独的Controller和它使用的models之间的交互的功能测试Functional test
3，关注story级的多个controllers的多个actions之间的交互的集成测试Integration test
今天我们就来看看跨越多个controllers的集成测试
IntegrationTesting/test/integration/stories_test.rb

require "#{File.dirname(__FILE__)}/../test_helper"

class StoriesTest < ActionController::IntegrationTest
  fixtures :accounts, :ledgers, :registers, :people

  def test_signup_new_person
    go_to_login
    go_to_signup
    signup :name => "Bob",
           :user_name => "bob",
           :password => "secret"
  end

  private
  def go_to_login
    get "/login"
    assert_response :success
    assert_template "login/index"
  end

  def go_to_signup
    get "/signup"
    assert_response :success
    assert_template "signup/index"
  end

  def signup(options)
    post "/signup", options
    assert_response :redirect
    follow_redirect!
    assert_response :success
    assert_template "ledger/index"
  end
end

其中我们将一些通用的流程做成helper方法，如go_to_login，go_to_signup，signup
我们甚至可以将登录认证等通用流程做成一个helper方法并放在我们自己的DSL模块里:

require "#{File.dirname(__FILE__)}/../test_helper"

class StoriesTest < ActionController::IntegrationTest
  fixtures :accounts, :ledgers, :registers, :people

  def test_multiple_users
    jim = new_session_as(:jim)
    bob = new_session_as(:bob)
    stacey = new_session_as(:stacey)

    jim.selects_ledger(:jims)
    jim.adds_account(:name => "checking:)
    bob.goes_to_preferences
    stacey.cancels_account
  end

  private

  module MyTestingDSL
    attr_reader :person

    def logs_in_as(person)
      @person = people(person)
      post authenticate_url, :user_name => @person.user_name, :password => @person.password
      is_redirected_to "ledger/list"
    end

    def goes_to_preferences
      # ...
    end

    def cancels_account
      # ...
    end

    def new_session_as(person)
      new_session do |sess|
        sess.goes_to_login
        sess.logs_in_as(person)
        yield sess if block_given?
      end
    end
end

我们会发现集成测试比单独Controller的功能测试慢许多，因为集成测试涉及的东西太多