使用RSpec测试销毁

Question

我在控制器中有这个

   def destroy
        @post = Post.find(params[:id])
        @post.destroy
    end

但是我对如何实际测试它是否有效一无所知。任何指针将不胜感激！我目前在我的RSpec文件中有这个：

require 'rails_helper'


RSpec.describe Post, type: :model do
  it "must have a title" do
    post= Post.create
    expect(post.errors[:title]).to_not be_empty
  end 
  it "must have a description" do
    post= Post.create
    expect(post.errors[:description]).to_not be_empty
  end 
  it "must have a location" do
    post= Post.create
    expect(post.errors[:location]).to_not be_empty
  end 
  it "must have an image" do
    post= Post.create
    expect(post.errors[:image]).to_not be_empty
  end 
  it "can be destroyed" do
    post= Post.destroy

  end 
end 

Answer 1

正如所指出的，如果您使用请求规范（请参阅https://relishapp.com/rspec/rspec-rails/v/3-9/docs/request-specs/request-spec，则可以轻松调用应删除模型的API，然后执行ActiveRecord查询以期望没有结果。

require "rails_helper"

RSpec.describe "delete thing api" do

  it "deletes thing" do

    // Create a thing with a factory of your choice here

    delete "/things", :thing => {:id => 1}

    expect(Thing.all.count).to be 0
  end
end

Answer 2

您可以检查事物计数是否改变了-1，如下所示：

expect { delete '/things', :thing => { :id => 123'} }.to change(Thing, :count).by(-1)

这意味着您想少一件东西，并确保已删除某些东西。

[如果要确保删除了特定的“事物”，可以在测试之前创建一个，将“事物” ID作为参数传递，并确保它在数据库中不存在，如下所示：

thing = create(:thing)
delete '/things', :thing => { :id => thing.id'}

expect(Thing.find_by(id: thing.id)).to be_nil