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Module: ActionDispatch::SystemTesting::TestHelpers::ScreenshotHelper

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In:
::ActionDispatch::SystemTestCase
Defined in: actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb

Overview

Screenshot helper for system testing.

Instance Attribute Summary

Instance Method Summary

Instance Attribute Details

#_screenshot_counter (rw, private)

[ GitHub ] 

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 52



attr_accessor :_screenshot_counter


  








  

    #failed?  ⇒ Boolean  (readonly, private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 143



def failed?
  !passed? && !skipped?
end


  








  

    #html_from_env?  ⇒ Boolean  (readonly, private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 54



def html_from_env?
  ENV["RAILS_SYSTEM_TESTING_SCREENSHOT_HTML"] == "1"
end


  








  

    #supports_screenshot?  ⇒ Boolean  (readonly, private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 147



def supports_screenshot?
  Capybara.current_driver != :rack_test
end


  







Instance Method Details



  

    #absolute_html_path   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 97



def absolute_html_path
  "#{absolute_path}.html"
end


  








  

    #absolute_image_path   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 89



def absolute_image_path
  "#{absolute_path}.png"
end


  








  

    #absolute_path   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 81



def absolute_path
  Rails.root.join(screenshots_dir, image_name)
end


  








  

    #display_image(html:, screenshot_output:)   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 123



def display_image(html:, screenshot_output:)
  message = +"[Screenshot Image]: #{image_path}\n"
  message << +"[Screenshot HTML]: #{html_path}\n" if html

  case screenshot_output || output_type
  when "artifact"
    message << "\e]1338;url=artifact://#{absolute_image_path}\a\n"
  when "inline"
    name = inline_base64(File.basename(absolute_image_path))
    image = inline_base64(File.read(absolute_image_path))
    message << "\e]1337;File=name=#{name};height=400px;inline=1:#{image}\a\n"
  end

  message
end


  








  

    #html_path   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 77



def html_path
  absolute_html_path.to_s
end


  








  

    #image_name   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 67



def image_name
  sanitized_method_name = method_name.gsub(/[^\w]+/, "-")
  name = "#{unique}_#{sanitized_method_name}"
  name[0...225]
end


  








  

    #image_path   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 73



def image_path
  absolute_image_path.to_s
end


  








  

    #increment_unique   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 58



def increment_unique
  @_screenshot_counter ||= 0
  @_screenshot_counter += 1
end


  








  

    #inline_base64(path)   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 139



def inline_base64(path)
  Base64.strict_encode64(path)
end


  








  

    #output_type   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 109



def output_type
  # Environment variables have priority
  output_type = ENV["RAILS_SYSTEM_TESTING_SCREENSHOT"] || ENV["CAPYBARA_INLINE_SCREENSHOT"]

  # Default to outputting a path to the screenshot
  output_type ||= "simple"

  output_type
end


  








  

    #relative_image_path   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 93



def relative_image_path
  "#{absolute_path.relative_path_from(Rails.root)}.png"
end


  








  

    #save_html   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 101



def save_html
  page.save_page(absolute_html_path)
end


  








  

    #save_image   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 105



def save_image
  page.save_screenshot(absolute_image_path)
end


  








  

    #screenshots_dir   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 85



def screenshots_dir
  Capybara.save_path.presence || "tmp/screenshots"
end


  








  

    #show(img)   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 119



def show(img)
  puts img
end


  








  

    #take_failed_screenshot  
  



  

    

Takes a screenshot of the current page in the browser if the test failed.



take_failed_screenshot is called during system test teardown.


  



  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 44



def take_failed_screenshot
  return unless failed? && supports_screenshot? && Capybara::Session.instance_created?

  take_screenshot
  metadata[:failure_screenshot_path] = relative_image_path if Minitest::Runnable.method_defined?(:metadata)
end


  








  

    #take_screenshot(html: false, screenshot: nil)  
  



  

    

Takes a screenshot of the current page in the browser.



take_screenshot can be used at any point in your system tests to take a screenshot of the current state. This can be useful for debugging or automating visual testing. You can take multiple screenshots per test to investigate changes at different points during your test. These will be named with a sequential prefix (or ‘failed’ for failing tests)



The default screenshots directory is tmp/screenshots but you can set a different one with Capybara.save_path



You can use the html argument or set the RAILS_SYSTEM_TESTING_SCREENSHOT_HTML environment variable to save the HTML from the page that is being screenshotted so you can investigate the elements on the page at the time of the screenshot



You can use the screenshot argument or set the RAILS_SYSTEM_TESTING_SCREENSHOT environment variable to control the output. Possible values are:



  



  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 31



def take_screenshot(html: false, screenshot: nil)
  showing_html = html || html_from_env?

  increment_unique
  save_html if showing_html
  save_image
  show display_image(html: showing_html, screenshot_output: screenshot)
end


  








  

    #unique   (private)
  

  [ GitHub ]


  

  


# File 'actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb', line 63



def unique
  failed? ? "failures" : (_screenshot_counter || 0).to_s
end