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这是我的测试代码：

require 'spec_helper'

describe Classroom, focus: true do

  let(:user) { build_stubbed(:user) }

  describe "associations" do
    it { should belong_to(:user) }
  end

  describe "validations" do
    it { should validate_presence_of(:user) }
    it { should validate_uniqueness_of(:name).scoped_to(:user_id) }

    context "should create a unique classroom per user" do

      before(:each) do
        @class = build_stubbed(:classroom, name: "Hello World", user: user)
        @class2 = build_stubbed(:classroom, name: "Hello World", user: user)
      end

      it "should not create the second classroom" do
        @class2.should have(1).errors_on(:name)
      end
    end
  end

  describe "instance methods" do

    before(:each) do
      @classroom = build_stubbed(:classroom)
    end

    describe "archive!" do

      context "when a classroom is active" do
        it "should mark classroom as inactive" do
          @classroom.stub(:archive!)
          @classroom.active.eql? false
        end
      end

    end

  end

end

这是我的课堂模型：

class Classroom < ActiveRecord::Base
  attr_accessible :user, :name

  belongs_to :user

  validates :user, presence: true
  validates_uniqueness_of :name, scope: :user_id, message: "already exists"

  def archive!
    update_attribute(:active, false)
  end
end

当我运行测试时，我收到以下错误：

1) Classroom validations 
     Failure/Error: it { should validate_uniqueness_of(:name).scoped_to(:user_id) }
       Expected errors to include "has already been taken" when name is set to "arbitrary_string", got errors: ["user can't be blank (nil)", "name already exists (\"arbitrary_string\")"]
     # ./spec/models/classroom_spec.rb:13:in `block (3 levels) in <top (required)>'

  2) Classroom validations should create a unique classroom per user should not create the second classroom
     Failure/Error: @classroom2.should have(1).errors_on(:name)
       expected 1 errors on :name, got 0
     # ./spec/models/classroom_spec.rb:24:in `block (4 levels) in <top (required)>'

我对编写测试相当陌生（尤其是使用 using Rspec）。只是想找人给我一些关于我做错了什么的建议。

4

1 回答 1

8

  1. 第一次验证失败：
    在您的模型中，您已经覆盖了 rspec 为唯一性验证生成的默认消息。所以在测试这样的验证时，你必须使用shoulda的 'with_message'选项。所以测试应该像
    “it { should validate_uniqueness_of(:name).scoped_to(:user_id) }.with_message('already exists')”

  2. 第二个验证失败：
    当您像第二个示例一样自己编写唯一性验证规范时，您必须创建一个已经存在于数据库中的记录并使用类似参数构建第二个记录。那么这个重复记录将无效，并且会出现预期的错误。
    所以在before(:each) 块中，将第一条 @classroom 记录保存在数据库中，而不是仅仅构建它

于 2013-04-23T08:06:13.943 回答