Hacky way to assert against the background color of an element

watir-webdriver-custom-matchers.rb

class BeStyledWithMatcher
  def self.match(element, expected_color, browser)
    element_class = element.instance_variable_get(:@selector)[:class].to_s
    element_class.chomp!(")")
    element_class = element_class[7, element_class.length]
    color=browser.execute_script("return $('.#{element_class}').css('background-color')")
    puts color
    expected_color == color
  end
end

RSpec::Matchers.define :have_background_color do |expected_color, browser |
  match do | element |
    BeStyledWithMatcher.match(element, expected_color, browser)
  end
end