铁轨上的红宝石 - 水豚不等待期待

Question

我有一个带有链接的页面，该链接使用简单的输入字段打开引导模式。我很难理解为什么水豚不等待模态打开，并立即失败。

我添加了expect(page).to have_content('Did you')，所以水豚会等待几秒钟，直到显示模态。但出于某种原因，它没有等待并提高了Capybara::ExpectationNotMet: expected to find text "Did you" in ...."

如果我休眠 1 秒，它将找到模态，但这还不够好，因为然后调用在我的 spec_helper.rb 中找到的数据库清理回调：

config.after(:each) do
  DatabaseCleaner.clean
end

这是规格：

RSpec.describe "follower button", type: :request do
  it "sends email #15B to owner", :js do
    using_wait_time 20 do
      FactoryGirl.create(:apartment_with_event)
      visit apartment_path(Apartment.last)
      click_on 'follow-events'
      expect(page).to have_content('Did you')
      within('#follow-events-modal') do
        fill_in 'follower-email-signup-mail', with: '[e-mail]'
        click_button 'follower-signup-submit'
      end
      expect(page).to have_content(I18n.t("followers.create.title_success"))
      expect(Follower.all.count).to eq(1)
    end
  end
end

我还在 spec_helper.rb 中设置了Capybara.default_max_wait_time = 10，即使此示例应该等待 20 秒。

忘了提，我正在使用水豚韦克比特作为驱动程序。

我真的花了几个小时试图找出它发生的原因，而其他例子运行良好。

更新：添加失败的完整回溯。

Failures:
  1) leeron's button sends email #15B to owner
     Failure/Error: raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}"
     ActionController::RoutingError:
       No route matches [GET] "/images/slider/missing.png"
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/rollbar-1.2.13/lib/rollbar/middleware/rails/show_exceptions.rb:22:in `call_with_rollbar'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/railties-4.2.4/lib/rails/rack/logger.rb:38:in `call_app'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/railties-4.2.4/lib/rails/rack/logger.rb:20:in `block in call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/railties-4.2.4/lib/rails/rack/logger.rb:20:in `call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/request_store-1.2.0/lib/request_store/middleware.rb:8:in `call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/rack-1.6.4/lib/rack/methodoverride.rb:22:in `call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/rack-1.6.4/lib/rack/runtime.rb:18:in `call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/rack-1.6.4/lib/rack/lock.rb:17:in `call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/rack-1.6.4/lib/rack/sendfile.rb:113:in `call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/railties-4.2.4/lib/rails/engine.rb:518:in `call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/railties-4.2.4/lib/rails/application.rb:165:in `call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/rack-1.6.4/lib/rack/urlmap.rb:66:in `block in call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/rack-1.6.4/lib/rack/urlmap.rb:50:in `each'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/rack-1.6.4/lib/rack/urlmap.rb:50:in `call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/capybara-2.7.1/lib/capybara/server.rb:43:in `call'
     # /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/rack-1.6.4/lib/rack/handler/webrick.rb:88:in `service'
     # ------------------
     # --- Caused by: ---
     # Capybara::ExpectationNotMet:
     #   expected to find text "Did you" in "...(REMOVED BY ME TO SAVE SPACE)..."
     #   /Users/etaiso/.rbenv/versions/2.2.3/gemsets/dorbel/gems/capybara-2.7.1/lib/capybara/node/matchers.rb:527:in `block in assert_text'
Finished in 3.87 seconds (files took 9.79 seconds to load)
1 example, 1 failure

Answer 1

从回调中我们可以看到实际的异常是来自应用程序的路由错误。 当 Capybara 重试/等待发现器和期望时，它会检查服务器抛出的错误，如果Capybara.raise_server_errors属实，它将在测试线程中引发它们，以便它们对测试可见。 在测试线程中从应用程序线程重新引发异常的副作用是，测试线程中的任何当前异常（例如 ExpectationNotMet）通常由 Capybara 处理和重试，Ruby 被 ruby 设置为应用程序异常的嵌套cause。 这不是真正的原因，但我们不能，因为 Capybara 重新引发它在那里显示的服务器错误的方式。 您可以设置Capybara.raise_server_errors = false或更好的是，修复丢失的图像。