每当遇到Capybara函数时,在运行Cucumber测试时获取“错误的参数类型Fixnum(预期字符串)(TypeError)”

我正在尝试在特性测试中使用水豚,但我不断遇到上述错误。然而,我的测试在涉及非水豚函数时有效。

以下是我的环境中的设置。rb:

    Capybara.server_host = 45454
    #Capybara.server_host = host
    Capybara.app_host = 'http://localhost:45454'
    Capybara.default_driver = :poltergeist

还为Phantomjs设置了PATH变量

下面是我面临问题的步骤定义文件。

   Given(/^I navigate to home page$/) do 
     visit '/'
   end

  And /^I take screenshot$/ do
    page.save_screenshot
  end

以下是功能文件

 Scenario: To validate the page shows up
   Given I navigate to home page
     And I take screenshot

以下是输出:

 Scenario: To validate the page shows up←[90m # features/home.feature:8←[0m
 ←[31mGiven I navigate to home page←[90m         # features/step_definitions/
 home_steps.rb:8←[0m←[0m
 ←[31m      wrong argument type Fixnum (expected String) (TypeError)←[0m
 ←[31m      ./features/step_definitions/home_steps.rb:9:in `/^I navigate to 
 home
 page$/'←[0m
 ←[31m      features/home.feature:9:in `Given I navigate to home page'←[0m
 ←[36mAnd I take screenshot←[90m                 # features/step_definitions/
  home_steps.rb:12←[0m←[0m
 ←[31m      wrong argument type Fixnum (expected String) (TypeError)←[0m

 ←[31mFailing Scenarios:←[0m
  ←[31mcucumber features/home.feature:8←[0m←[90m # Scenario: To validate the 
 page
 shows up←[0m

 1 scenario (←[31m1 failed←[0m)
 2 steps (←[31m1 failed←[0m, ←[36m1 skipped←[0m)
  0m0.649s