失败：预期 0 在 ruby​​ on rails 上 >= 1

Question

我正在做 Hartle 教程，每次运行 rake 测试时都会看到此失败，我看到此失败：

  1) Failure:
StaticPagesControllerTest#test_should_get_help [.../sample_app/test/controllers/static_pages_controller_test.rb:14]:
<Help | Ruby on Rails Tutorial Sample App> expected but was
<Ruby on Rails Tutorial Sample App>..
Expected 0 to be >= 1.

这是什么意思？我该如何解决？这是我的 static_pages_controller_test.rb 文件。

require 'test_helper'

class StaticPagesControllerTest < ActionController::TestCase

  test "should get home" do
    get :home
    assert_response :success
    assert_select "title", "Ruby on Rails Tutorial Sample App"   end

  test "should get help" do
    get :help
    assert_response :success
    assert_select "title", "Help | Ruby on Rails Tutorial Sample App"   end

  test "should get about" do
    get :about
    assert_response :success
    assert_select "title", "About | Ruby on Rails Tutorial Sample App"   end

  test "should get contact" do
    get :contact
    assert_response :success
    assert_select "title", "Contact | Ruby on Rails Tutorial Sample App"   end end

这是第 14 行。

assert_select "title", "Help | Ruby on Rails Tutorial Sample App"

Answer 1

问题是没有 html 匹配"Help | Ruby on Rails Tutorial Sample App"。

如果您查看 的定义assert_select，它接受:count作为（可选）参数。如果count未指定 ，则会将 的最小出现次数设置html为 1。这就是您收到的错误为 的原因Expected 0 to be >= 1.。在您的情况下，有 0 场比赛，而测试预计至少有 1 场比赛。