Rails 教程 - 调试 bundle exec rake 测试

Question

我是新用户，所以请不要杀了我。我一直在阅读 Michael Hartl 的 Rails 教程第 9 章，并取得了一些成功。在运行“bundle exec rake test”命令时，我遇到了 3 个错误。这些不会影响测试的状态，因此根据 Hartl 先生的规范，我的测试仍然是红色或绿色，但我的网页在 Web 上的外观存在一些问题，我担心错误可能会滚雪球。

有人知道这里发生了什么吗？我已经尽我所能在 Cloud9 IDE 中手动键入了他的代码块，因此语法应该是正确的，并且 100% 准确。我的背景是 Java 和 C#，这些让我想起了编译器错误。

1) 错误：

UsersLoginTest#test_login_with_valid_information_followed_by_logout: NoMethodError: undefined method `forget' for nil:NilClass
    app/helpers/sessions_helper.rb:41:in `forget'
    app/helpers/sessions_helper.rb:48:in `log_out'
    app/controllers/sessions_controller.rb:18:in `destroy'
    test/integration/users_login_test.rb:33:in `block in <class:UsersLoginTest>'

2) 错误：

UsersIndexTest#test_index_as_a_non-admin: SyntaxError: /home/ubuntu/workspace/sample_app/app/views/users/index.html.erb:12: syntax error, unexpected keyword_ensure, expecting end-of-input
    test/integration/users_index_test.rb:31:in `block in <class:UsersIndexTest>'

3) 错误：

UsersIndexTest#test_index_as_admin_including_pagination_and_delete_links:
NoMethodError: undefined method `email' for nil:NilClass
    test/test_helper.rb:19:in `log_in_as'
    test/integration/users_index_test.rb:11:in `block in <class:UsersIndexTest>'

37 runs, 84 assertions, 0 failures, 3 errors, 0 skips

test/models/test_helper.rb

<% provide(:title, 'All users') %>

<h1>All users</h1>

<%= will_paginate %>

<ul class="users">
  <%= render @users %>
  <% end %>
</ul>

<%= will_paginate %>

测试/集成/users_index_test.rb

require 'test_helper'

class UsersIndexTest < ActionDispatch::IntegrationTest

  def setup
    @admin     = users(:michael)
    @non_admin = users(:archer)
  end

  test "index as admin including pagination and delete links" do
    log_in_as(@user)
    get users_path
    assert_template 'users/index'
    assert_select 'div.pagination'
    first_page_of_users = User.paginate(page: 1)
    first_page_of_users.each do |user|
      assert_select 'a[href=?]', user_path(user), text: user.name
      unless user == @admin
        assert_select 'a[href=?]', user_path(user), text: 'delete',
                                                    method: :delete

      end
    end
    assert_difference 'User.count', -1 do
      delete user_path(@non_admin)
    end
  end

  test "index as a non-admin" do
    log_in_as(@non_admin)
    get users_path
    assert_select 'a', text: 'delete', count: 0
  end
end

测试/集成/users_login_test.rb

require 'test_helper'

class UsersLoginTest < ActionDispatch::IntegrationTest

  def setup
    @user = users(:michael)
  end

  test "login with invalid information" do  
    get login_path
    assert_template 'sessions/new'
    post login_path, session: { email: "", password: "" }
    assert_template 'sessions/new'
    assert_not flash.empty?
    get root_path
    assert flash.empty?
  end

  test "login with valid information followed by logout" do
    get login_path
    post login_path, session: { email: @user.email, password: 'password' }
    assert is_logged_in?
    assert_redirected_to @user
    follow_redirect!
    assert_template 'users/show'
    assert_select "a[href=?]", login_path, count: 0
    assert_select "a[href=?]", logout_path
    assert_select "a[href=?]", user_path(@user)
    delete logout_path
    assert_not is_logged_in?
    assert_redirected_to root_url
    # Simulate a user clicking logout in a second window
    delete logout_path
    follow_redirect!
    assert_select "a[href=?]", login_path
    assert_select "a[href=?]", logout_path,       count: 0
    assert_select "a[href=?]", user_path(@user),  count: 0
  end

  test "login with remembering" do
    log_in_as(@user, remember_me: '0')
    assert_nil cookies['remember_token']
  end

  test "login without remembering" do
    log_in_as(@user, remember_me: '0')
    assert_nil cookies['remember_token']
  end
end

Answer 1

错误 #1：您需要提供更多详细信息。但是错误跟踪表明，当您第二次使用 delete 方法调用 logout_path 时出现问题。你能提供你的sessions_helper.rb文件吗？

错误 #2 似乎来自 index.html.erb 模板。可以发一下代码吗？

错误 #3：您尝试以 @user 登录，但未定义此实例变量。将log_in_as(@user) 行更改为：log_in_as(@admin)。

另外，请注意您的测试 "login with remembering" 是错误的，应该是：

test "login with remembering" do
  log_in_as(@user, remember_me: '1')
  assert_not_nil cookies['remember_token']
end