Rails：为您的单元测试预先制作模型实例（用于 DRY 目的）？答案

【问题标题】：Rails: Premake a model instance for your unit tests (for DRY purposes)?Rails：为您的单元测试预先制作模型实例（用于 DRY 目的）？
【发布时间】：2012-12-04 19:33:29
【问题描述】：

我第一次尝试在我的User 模型中进行自己的测试，我意识到对于每个测试我都有一个user = User.create(:name => "something", :age => 3, :gender => "m") 的声明。是否有用于测试的 before_filter 或类似的东西，这样我就不必为每个测试创建一个用户？或者以某种方式将它放在全局命名空间中，以便在任何地方都可以访问它？

require 'test_helper'

class UserTest < ActiveSupport::TestCase
  test "user is created" do
    user = User.create(:name => "Edmund", :age => 3, :gender => "m")
    assert_equal user, User.find_by_name("Edmund")
    assert_equal 3, User.count
  end

  test "user has sent messages" do
    user = User.create(:name => "Edmund", :age => 3, :gender => "m")
    2.times do 
      user.sent_messages.create(:sender_id => user.id)
    end
    assert_equal 2, user.sent_messages.count
  end

  test "user has received messages" do
    user = User.create(:name => "Edmund", :age => 3, :gender => "m")
    2.times do
      user.received_messages.create(:receiver_id => user.id)
    end
    assert_equal 2, user.received_messages.count
  end


end

【问题讨论】：

标签： ruby-on-rails

【解决方案1】：

是的，您可以为在每次测试之前运行的测试定义设置方法。如果您在那里定义了一个全局变量，那么它在所有测试用例中都可以访问。

例如：

class UserTest < ActiveSupport::TestCase

  setup do
    @user = User.create(:name => "Edmund", :age => 3, :gender => "m")
  end

  test "user has sent messages" do
    2.times do 
      @user.sent_messages.create(:sender_id => user.id)
    end
    assert_equal 2, @user.sent_messages.count
  end

end

【讨论】：