problem with cookie escaping on integration tests

Cookie escaping is not working out of the box with integration tests. Here is the problem in more understandable ruby form - since I am bad at explaining:

class CookieTest < ActionController::IntegrationTest
  def setup
    ...
    cookies[:remember_me] = "1;abcdefg"
    p cookies  # => {:remember_me=>"1;abcdefg"} 
  end

  test "cookie escaping" do
    visit '/'
    p cookies  # => {"abcdefg"=>nil, "remember_me"=>"1"} 
  end
end

I can solve the problem by:

class CookieTest < ActionController::IntegrationTest
  def setup
    ...
    cookies[:remember_me] = Rack::Utils.escape("1;abcdefg")
    p cookies  # => {:remember_me=>"1;abcdefg"}
  end

  test "cookie escaping" do
    visit '/'
    p cookies  # => {:remember_me=>"1;abcdefg"} 
  end
end

I think this should work without me explicitly calling Rack::Utils.escape on setip for the value I want to set on cookie.