使用水豚和Rspec进行功能测试 - 单击按钮不会重定向到正确的路线

Question

我使用的是Rspec 3.0和水豚2.4.3。我在spec/features/named challenge_users_spec.rb 中制作了一个功能规范

require "rails_helper"
feature "Challenge users" do
  let!(:challenge) { create(:challenge)}
  let(:user) { create(:user)}
  context "as a registered user" do
    before :each do
      sign_in(user)
    end
    scenario "challenges himself" do
      expect(current_path).to eq root_path
      expect(page).to have_content challenge.name
      click_button 'Accept'
      expect(page).to have_content 'You accepted the challenge!'
      expect(user.accepted_dares.count).to eq 1
    end
    scenario 'challenges other user' do
      expect(current_path).to eq root_path
      click_button 'Challenge others'
      expect(current_path).to eq new_challenge_dare_path(challenge_id: challenge.id)
      expect(page).to have_content 'Challenge with a bet!'
    end
  end
end

在第一个场景中，页面呈现正确的flash消息，但不更新用户。在第二个场景中，单击"挑战他人"后，current_path被设置为"/"，而不是"挑战/：id/dales/new"，因此没有达到最后两个预期。Dares模型是一个嵌套路由：

  resources :challenges do
    resources :dares
  end

控制器方法大多是标准CRUD方法。

这是Rspec日志：

Failures:
  1) Challenge users as a registered user challenges himself
     Failure/Error: expect(user.accepted_dares.count).to eq 1
       expected: 1
            got: 0
       (compared using ==)
     # ./spec/features/challenge_users_spec.rb:18:in `block (3 levels) in <top (required)>'
  2) Challenge users as a registered user challenges other user
     Failure/Error: expect(current_path).to eq new_challenge_dare_path(challenge_id: challenge.id)
       expected: "/challenges/2/dares/new"
            got: "/"
       (compared using ==)
     # ./spec/features/challenge_users_spec.rb:26:in `block (3 levels) in <top (required)>'
Finished in 0.91199 seconds (files took 3.62 seconds to load)
2 examples, 2 failures
Failed examples:
rspec ./spec/features/challenge_users_spec.rb:10 # Challenge users as a registered user challenges himself
rspec ./spec/features/challenge_users_spec.rb:21 # Challenge users as a registered user challenges other user

型号：

Dare

class Dare < ActiveRecord::Base
  belongs_to :challenge, counter_cache: true
  belongs_to :acceptor, class_name: "User"
  belongs_to :challenger, class_name: "User"
  has_many :votes
  before_save :change_status
  before_save :create_start_date
  before_save :set_proof_array
  def set_proof_array
    if self.utube_link.nil?
      self.utube_link = []
      save!
    end
  end
  def create_start_date
    if status == 'Accepted' && start_date.blank?
      self.start_date = DateTime.now
    end
  end
  def change_status
    if status.blank?
      if self.acceptor_id == self.challenger_id
        self.status = "Accepted"
      else
        self.status = "Pending"
      end
    end
  end
...
end

用户

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  has_many :dares, foreign_key: :challenger_id
  has_many :accepted_dares, class_name: "Dare", foreign_key: :acceptor_id
  has_many :challenges, through: :dares
  has_many :votes
  validates :username, presence: true, uniqueness: true, length: { in: 2..50 }
    ....
end

挑战

class Challenge < ActiveRecord::Base
  has_many :dares
  has_many :users, through: :dares, source: :challenges
  validates :name, presence: true, uniqueness: true, length: { in: 5..100 }
  validates :description, presence: true, length: { in: 10..500 }
  include PgSearch
  pg_search_scope :search, against: [:name, :description],
                  using: {tsearch: {prefix: true, dictionary: "english" }}
  ...
end

编辑

我没有提到这一点，但我在我的应用程序中使用了Turbolinks。在我的测试中添加js:true后，第二个测试通过了，但第一个测试仍然抛出了一个错误：

1) Challenge users as a registered user challenges himself
     Failure/Error: expect(user.reload.accepted_dares.count).to eq 1
       expected: 1
            got: 0
       (compared using ==)

Answer 1

这是两个不相关的问题。

用户模型不更新的原因是，它在内存中是一个完全独立的实例，与在后端更改的实例完全不同。您需要强制它从数据库中重新加载：

expect(user.reload.accepted_dares.count).to eq 1

current_path没有为您提供期望值的原因是click_button是一个异步操作。您对current_path的断言将在单击按钮后立即执行，然后才有机会加载新页面。

Capybara的许多操作（如find）会自动等待并重试，直到条件为真（在find的情况下，它会等待选择器匹配页面上的某个内容），但由于current_path没有任何条件，它会立即返回当前值（Capybara不知道在调用该方法时您期望的当前路径是什么）。

测试这一点的更好方法是查找一些内容，这些内容只会在单击按钮并重新加载页面后出现在页面上。这迫使Capybara在继续之前等待内容。

在这种情况下，颠倒两个断言的顺序就可以了：

expect(page).to have_content 'Challenge with a bet!'
expect(current_path).to eq new_challenge_dare_path(challenge_id: challenge.id)