railstutorial.org - Ruby on Rails 教程第 3 版，第 11 章，练习 3，图像 uploader 测试

Question

指令是这样的:

按照 list 11.68 中的模板，编写第 11.4 节中的图像 uploader 测试。作为准备，您应该将图像添加到fixtures目录(使用例如cp app/assets/images/rails.png test/fixtures/)。 (如果你使用 Git，我还建议更新你的 .gitignore 文件，如 list 11.69 所示。)为了避免混淆错误，你还需要配置 CarrierWave 以通过创建一个初始化文件来跳过测试中的图像大小调整，如 list 11.70。 list 11.68 中的附加断言检查主页上的文件上传字段和有效提交产生的​​微博上的有效图像属性。注意使用特殊的fixture_file_upload 方法将文件上传为测试中的fixture。22 提示:要检查有效的图片属性，请使用第10.1.4 节中提到的assigns 方法在有效提交后访问create action 中的微帖子。

这是我在 test/integration/micrposts_interface_test.rb 中的代码

  test "micropost interface" do
    log_in_as(@user)
    get root_path
    assert_select 'div.pagination'
    assert_select 'input[type=FILL_IN]'
    # Invalid submission
    assert_no_difference 'Micropost.count' do
      post microposts_path, micropost: { content: "" }
    end
    assert_select 'div#error_explanation'
    # Valid submission
    content = "This micropost really ties the room together"
    picture = fixture_file_upload('test/fixtures/rails.png', 'image/png')
    assert_difference 'Micropost.count', 1 do
      post microposts_path, micropost: { content: content, picture: FILL_IN }
    end
    assert FILL_IN.picture?
    follow_redirect!
    assert_match content, response.body
    # Delete a post.
    assert_select 'a', text: 'delete'
    first_micropost = @user.microposts.paginate(page: 1).first
    assert_difference 'Micropost.count', -1 do
      delete micropost_path(first_micropost)
    end
    # Visit a different user.
    get user_path(users(:archer))
    assert_select 'a', text: 'delete', count: 0
  end

在assert_select 'input[type=FILL_IN]'中，我的填写是type=file

在post microposts_path, micropost: { content: content, picture: FILL_IN }，我的填写是picture: true

在断言 FILL_IN.picture 中？是@user.microposts.picture？

我得到的错误是:NoMethodError:NoMethodError:未定义的方法“图片？”对于#

所以我认为我的前两个 FILL_IN 是正确的。问题出在第三次填写。我写@user.microposts 是因为我想测试图片是否存在？它必须在用户的微博上。但是错误是没有图片的方法？

我也试过@user.micropost.picture?，错误是NoMethodError: NoMethodError: undefined method `micropost' for #

我认为我的推理是正确的，但显然不是。帮助!我是个新手。

Answer 1

我的解决方案，它似乎有效:

test "micropost interface" do
  log_in_as(@user)
  get root_path
  assert_select 'div.pagination'
  assert_select 'input[type=file]'
  # Invalid submission
  assert_no_difference 'Micropost.count' do
    post microposts_path, micropost: { content: "" }
  end
  assert_select 'div#error_explanation'
  # Valid submission
  content = "This micropost really ties the room together"
  picture = fixture_file_upload('test/fixtures/sample-image.jpg', 'image/jpg')
  assert_difference 'Micropost.count', 1 do
    post microposts_path, micropost: { content: content, picture: picture }
  end
  assert assigns(:micropost).picture?
  assert_redirected_to root_url
  follow_redirect!
  assert_match content, response.body
  # Delete a post.
  assert_select 'a', text: 'delete'
  first_micropost = @user.microposts.paginate(page: 1).first
  assert_difference 'Micropost.count', -1 do
    delete micropost_path(first_micropost)
  end
  # Visit a different user.
  get user_path(users(:archer))
  assert_select 'a', text: 'delete', count: 0
end