class Rails::Dom::Testing::Assertions::SelectorAssertions::HTMLSelector

def extract_selectors
  selector = @values.shift
  unless selector.is_a? String
    raise ArgumentError, "Expecting a selector as the first argument"
  end
  @css_selector = context.substitute!(selector, @values.dup, true)
  @selector     = context.substitute!(selector, @values)
end