爲模型名稱唯一性編寫測試

Question

我有一個教程模型屬於用戶模型。我希望教程標題在每個用戶級別都是唯一的。因此，兩個用戶可以使用相同標題的教程，但用戶不能擁有兩個具有相同標題的教程。我的測試失敗了，但我知道我正在糾正過濾出重複的標題。我的測試出了什麼問題？

# model - tutorial.rb 
class Tutorial < ActiveRecord::Base 
    attr_accessible :title 
    belongs_to :user 

    validates :user_id, presence: true 
    validates :title, presence: true, length: { maximum: 140 }, uniqueness: { :scope => :user_id } 
end 

# spec for model 
require 'spec_helper' 
describe Tutorial do 
    let(:user) { FactoryGirl.create(:user) } 
    before do 
    @tutorial = FactoryGirl.create(:tutorial, user: user) 
    end 

    subject { @tutorial } 

    describe "when a title is repeated" do 
    before do 
     tutorial_with_same_title = @tutorial.dup 
     tutorial_with_same_title.save 
    end 
    it { should_not be_valid } 
    end 
end 

# rspec output 
Failures: 
    1) Tutorial when a title is repeated 
    Failure/Error: it { should_not be_valid } 
     expected valid? to return false, got true 
    # ./spec/models/tutorial_spec.rb:50:in `block (3 levels) in <top (required)>' 

Answer 1

與測試問題是這樣的一行：

it { should_not be_valid }

該規範檢查valid?您的測試，這是@tutorial的主題 - 這是有效的。

建議重構：

describe Tutorial do 
    let(:user) { FactoryGirl.create(:user) } 
    before do 
    @tutorial = FactoryGirl.create(:tutorial, user: user) 
    end 

    subject { @tutorial } 

    describe "when a title is repeated" do 
    subject { @tutorial.dup } 
    it { should_not be_valid } 
    end 
end