无法在 Capybara/Cucumber 中创建评论

Question

我有以下特点：

Scenario: when delete a post
  Given I created a post with the title "Test", author "Testauthor" and body "Testbody"
  When I browse "/posts" and click on "Destroy"
  Then I should see the text "Comment was successfully destroyed."

有问题的代码是这样给定的实现：

Given(/^I created a post with a comment with title "([^"]*)", author "([^"]*)" and body "([^"]*)"$/) do |title, author, body|
  post = Post.create! title: 'Test', author: 'Test', body: 'Test', published_at: DateTime.now
  Comment.create! title: title, author: author, body: body, published_at: DateTime.now, post_id: post.id
end

由于某种原因 expect(Comment.count).to eq(1) 是假的，没有评论。我做错了什么？

已添加存储库： https://github.com/cwansart/SQ-Hausarbeit/tree/cucumber/features 这是 posts_show.feature 和 posts_show_steps.rb。

Answer 1

我克隆了你的 repo 并看了一下。

  Scenario: when delete a post
    Given I created a post with the title "Test", author "Testauthor" and body "Testbody"
    When I browse "/posts" and click on "Destroy"
    Then I should see the text "Comment was successfully destroyed."

posts_show_steps.rb:

Given(/^I created a post with a comment with title "([^"]*)", author "([^"]*)" and body "([^"]*)"$/) do |title, author, body|
  post = Post.create! title: 'Test', author: 'Test', body: 'Test', published_at: DateTime.now
  Comment.create! title: title, author: author, body: body, published_at: DateTime.now, post_id: post.id

  print "#########################"
  print Comment.all.pretty_print_inspect
  ## this shows the comment. It **does** exist...
end

When(/^I browse "([^"]*)" and click on "([^"]*)"$/) do |url, click_text|
  print "#########################"
  print Comment.all.pretty_print_inspect
  ## here it doesn't exist any longer...

  visit url
end

在这里，你创建了一个post 没有评论，这是第一个问题，即没有要删除的评论！这可以通过将 Given 更改为：

来解决

Given I created a post with a comment with title "CommTitle", author "CommAuthor" and body "CommBody"

（也可以重用该步骤定义，但如果此测试只是创建一个没有评论的 post，严格来说，这会更好。）

您还需要实际单击步骤定义中的“销毁”link - 在步骤定义中的 visit url 之后添加 click_on click_text。

您还需要将 posts_show_feature.rb 规范中的 "Comment was successfully destroyed." 更改为 "Post was successfully destroyed."，因为这是您现在正在测试的内容。

该测试现在将通过。

但是，您想测试 Post 的 Comment 是否在 Post 被销毁时被销毁，是吗？

这最好在单元测试级别完成：

安装rspec-railsgem:

宝石文件：

group :test, :development do
  gem 'rspec-rails', '~> 3.5'
end

运行 rails g rspec:install

创建以下规范：

spec/models/comment_spec.rb:

require 'rails_helper'

RSpec.describe Comment, type: :model do
  let(:post) { Post.create(title: 'title', author: 'author', body: 'body', published_at: DateTime.now) }

  it 'is destroyed when its associated Post is destroyed' do
    post.comments.create(title: 'title', author: 'author', body: 'body', published_at: DateTime.now)
    expect { post.destroy }.to change{ Comment.count }.by(-1)
  end
end

有几种方法可以达到该规范，但这是另一次争论 - 这是一种方法。

要使此测试通过（运行 rspec 至运行此测试），请向您的 Post 模型添加 'dependent destroy' 声明：

app/models/post.rb:

class Post < ApplicationRecord
  has_many :comments, dependent: :destroy

  validates :author, presence: true
  validates :title, presence: true
  validates :body, presence: true
  validates :published_at, presence: true
end

这将使您的测试通过！

作为最后的提示，将 --format documentation 放入您的 .rspec 文件中，以使 rspec 打印通过测试（我的个人偏好）。

然后我将构建一个名为 'tests' 的 Rake 任务，它运行既是您的 RSpec 规范又是您的 Cucumber 规范，但这不适用于此线程。

无法在 Capybara/Cucumber 中创建评论

Can't create a comment in Capybara/Cucumber

ruby-on-rails

cucumber

capybara