Rails 教程失败 9.25 测试预期“”为零

问题描述

我重新发布这个问题是因为我在 Rails 教程的这一部分也遇到了问题。我找到了一种不同的解决方法，现在测试通过了，但我想知道，因为我对这个很陌生，如果它有相同的效果？

user_login_test.rb

 require 'test_helper'

class UsersLoginTest < Actiondispatch::IntegrationTest

  # I deleted most of the file as Stack kept telling me I was posting too much code and not enough problem.

  test 'Login with remember' do
    log_in_as(@user,remember_me: '1')
    assert_not_nil cookies['remember_token']
  end

  test 'Login without remember' do
    # Log in to set the cookie.
    log_in_as(@user,remember_me: '1')
    # log in again and verify that the cookie is deleted.
    log_in_as(@user,remember_me: '0')

** This seems to be the problem line of code **
    assert_nil cookies['remember_token']

  end
end ```

I replaced it with 

断言 cookie['remember_token'].blank?

test Now passes,but am I allowing a bug by not forcing nil or as long as the cookie is blank then its functionality is the same? 

I can add sessions_controller.rb and test_helper.rb if it helps,or any other files that would be helpful. 

解决方法

如果您将 cookie 键的值设置为 nil，它将被解释为空字符串。

因此，您必须问问自己，您的应用程序中 cookies['remember_token'] = "" 的定义是什么。如果 "" 在您的上下文中等同于 nil，那么使用 #blank? 进行断言就可以了。