selenium_js_console_output.rb

# prereq: have sauce username and accesskey set as environment variables
# i.e. export SAUCE_USERNAME=YOUR_USERNAME
#      export SAUCE_ACCESS_KEY=YOUR_ACCESS_KEY

# Only works in firefox

require 'selenium-webdriver'

url = "http://#{ENV['SAUCE_USERNAME']}:#{ENV['SAUCE_ACCESS_KEY']}@ondemand.saucelabs.com:80/wd/hub".strip

driver = Selenium::WebDriver.for(:remote, :url => url,
				:desired_capabilities => {
					:browserName => 'firefox',
					:version => '38',
					:platform => 'OS X 10.11',
					:logging_prefs => {:browser => :all},
				})

driver.get 'https://www.optimizely.com/'

puts "JS Console Output is :\n-------------------\n\n"
puts driver.manage.logs.get(:browser)

driver.quit