ruby-on-rails - 为什么 url hepler 在测试中不起作用？

Question

规范/rails_helper.rb

ENV['RAILS_ENV'] ||= 'test'
require File.expand_path('../../config/environment', __FILE__)
abort("The Rails environment is running in production mode!") if Rails.env.production?
require 'spec_helper'
require 'rspec/rails'
require 'capybara/rspec'
require 'factory_girl_rails'

Dir[Rails.root.join('spec/support/**/*.rb')].each { |f| require f }

ActiveRecord::Migration.maintain_test_schema!

RSpec.configure do |config|
  config.include Rails.application.routes.url_helpers

  config.infer_spec_type_from_file_location!

  config.before(:suite) { DatabaseCleaner.clean_with :truncation }
  config.before(:each) { DatabaseCleaner.strategy = :transaction }

  config.before(:each, js: true) do
    DatabaseCleaner.strategy = :truncation
  end

  config.before(:each) { DatabaseCleaner.start }
  config.after(:each) { DatabaseCleaner.clean }
  config.filter_rails_from_backtrace!
end

规范/spec_helper.rb

RSpec.configure do |config|
  config.expect_with :rspec do |expectations|
    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
  end

  config.mock_with :rspec do |mocks|
    mocks.verify_partial_doubles = true
  end
end

我的测试

require 'rails_helper'

RSpec.describe "Test if root exists", type: :request do
  describe "GET /" do
    it "visits root" do
      visit root_url
      expect(current_url).to eql(root_url)
    end
  end
end

当我尝试运行此测试时，收到错误

Failures:

  1) Test if root exists GET / visits root
     Failure/Error: visit root_url

     NoMethodError:
       undefined method `empty?' for nil:NilClass
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7.1/lib/action_dispatch/routing/route_set.rb:761:in `optimize_routes_generation?'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7.1/lib/action_dispatch/routing/url_for.rb:175:in `optimize_routes_generation?'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7.1/lib/action_dispatch/routing/route_set.rb:241:in `optimize_routes_generation?'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7.1/lib/action_dispatch/routing/route_set.rb:218:in `call'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7.1/lib/action_dispatch/routing/route_set.rb:345:in `block (2 levels) in define_url_helper'
     # ./spec/features/root_spec.rb:6:in `block (3 levels) in <top (required)>'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:254:in `instance_exec'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:254:in `block in run'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:496:in `block in with_around_and_singleton_context_hooks'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:453:in `block in with_around_example_hooks'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/hooks.rb:464:in `block in run'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/hooks.rb:604:in `block in run_around_example_hooks_for'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:338:in `call'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-rails-3.5.2/lib/rspec/rails/adapters.rb:127:in `block (2 levels) in <module:MinitestLifecycleAdapter>'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:443:in `instance_exec'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:443:in `instance_exec'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/hooks.rb:375:in `execute_with'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/hooks.rb:606:in `block (2 levels) in run_around_example_hooks_for'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:338:in `call'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/hooks.rb:607:in `run_around_example_hooks_for'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/hooks.rb:464:in `run'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:453:in `with_around_example_hooks'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:496:in `with_around_and_singleton_context_hooks'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example.rb:251:in `run'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example_group.rb:627:in `block in run_examples'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example_group.rb:623:in `map'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example_group.rb:623:in `run_examples'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example_group.rb:589:in `run'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example_group.rb:590:in `block in run'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example_group.rb:590:in `map'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/example_group.rb:590:in `run'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:113:in `block (3 levels) in run_specs'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:113:in `map'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:113:in `block (2 levels) in run_specs'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/configuration.rb:1835:in `with_suite_hooks'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:112:in `block in run_specs'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/reporter.rb:77:in `report'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:111:in `run_specs'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:87:in `run'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:71:in `run'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/lib/rspec/core/runner.rb:45:in `invoke'
     # /Users/mike/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rspec-core-3.5.4/exe/rspec:4:in `<top (required)>'
     # ./bin/rspec:7:in `load'
     # ./bin/rspec:7:in `<main>'

发生这种情况是因为root_url。我尝试打印 root_url 的值并得到相同的错误。不知道如何修复

Answer 1

Capybara 与 :feature 规范一起使用，而不是与 :request 规范一起使用。因此，rspec-rails 将 url 帮助程序包含到功能示例组中 - https://github.com/rspec/rspec-rails/blob/e8054a1cd03044f725030fe8315952cf3799a395/lib/rspec/rails/example/feature_example_group.rb#L15

将 type: :request 更改为 type: :feature