使用Capybara和Minitest來測試JavaScript

Question

已經提出了這個問題的幾個變體，我肯定從閱讀這個主題中學到了，但大多數答案似乎並不直接適用於這種情況，或涉及使用Rspec或Cucumber的解決方案。

我目前正在使用Minitest和Capybara開發測試套件。 如果可能的話，我不想帶太多其他寶石，但如果它們很輕，我會對它開放，因為測試已經花了一段時間才能運行。

Rspec有:js => true ，Cucumber有@javascript ，但minitest似乎沒有這樣的東西。 那么，自然的解決方案是切換驅動程序並執行： Capybara.current_driver = :selenium ，但是當我這樣做時，它不起作用，我得到2個錯誤（每個啟用js的測試都有一個錯誤）。

我的問題是：為什么我會收到這些錯誤，如何進行一些基本的JavaScript測試呢？ 這是錯誤：

Component returned failure code: 0x804b0012 (NS_ERROR_UNKNOWN_PROTOCOL) [nsIWebNavigation.loadURI]
    Exception `Selenium::WebDriver::Error::UnknownError' at:
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/response.rb:52:in `assert_ok'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/response.rb:15:in `initialize'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/http/common.rb:59:in `new'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/http/common.rb:59:in `create_response'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/http/default.rb:65:in `request'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/http/common.rb:40:in `call'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/bridge.rb:598:in `raw_execute'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/bridge.rb:576:in `execute'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/remote/bridge.rb:99:in `get'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/selenium-webdriver-2.25.0/lib/selenium/webdriver/common/navigation.rb:14:in `to'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/capybara-1.1.2/lib/capybara/selenium/driver.rb:36:in `visit'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/capybara-1.1.2/lib/capybara/session.rb:157:in `visit'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/capybara-1.1.2/lib/capybara/dsl.rb:161:in `visit'
    test/integration/resource_access_test.rb:22:in `block (2 levels) in <top (required)>'

這是另一個錯誤：

undefined method `[]' for nil:NilClass
    Exception `NoMethodError' at:
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/rack-test-0.6.1/lib/rack/test.rb:171:in `env_for'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/rack-test-0.6.1/lib/rack/test.rb:56:in `get'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/capybara-1.1.2/lib/capybara/rack_test/browser.rb:62:in `process'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/capybara-1.1.2/lib/capybara/rack_test/browser.rb:21:in `visit'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/capybara-1.1.2/lib/capybara/rack_test/driver.rb:32:in `visit'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/capybara-1.1.2/lib/capybara/session.rb:157:in `visit'
    /Users/epithelialbiology/.rvm/gems/ruby-1.9.2-p320/gems/capybara-1.1.2/lib/capybara/dsl.rb:161:in `visit'
    test/integration/resource_access_test.rb:40:in `block (2 levels) in <top (required)>'

有誰知道這里會發生什么，以及我如何解決這個問題？

Answer 1

請嘗試以下語法來切換Capybara驅動程序：

Capybara.current_driver = Capybara.javascript_driver