在 Michael Hartl 的 Rails 教程的第 8 章，清单 8.25 测试套件 RED

Question

我是 StackOverflow 的新手，因为我最近开始通过 Michael Hartl 的教程学习 Ruby on Rails。我似乎无法通过清单 8.25 的测试（“此时，测试套件应该仍然是绿色的：”$ bundle exec rake test）：

我的测试是RED，错误如下：

~/workspace/sample_app (log-in-log-out) $ bundle exec rake test
Started

ERROR["test_layout_links", SiteLayoutTest, 2016-04-14 23:15:47 +0000]
 test_layout_links#SiteLayoutTest (1460675747.92s)
NoMethodError:         NoMethodError: undefined method `full_title' for #    <SiteLayoutTest:0x0000000a30bad8>
            test/integration/site_layout_test.rb:13:in `block in     <class:SiteLayoutTest>'
    test/integration/site_layout_test.rb:13:in `block in <class:SiteLayoutTest>'

  22/22: [======================================================] 100% Time:     00:00:01, Time: 00:00:01

Finished in 1.30261s
 tests, 49 assertions, 0 failures, 1 errors, 0 skips

我再次浏览了第 7 章和第 8 章中的所有最新变化； 8.20、8.21、8.24的测试刚刚通过。

错误中提到的文件 site_layout_test 如下所示：

require 'test_helper'

class SiteLayoutTest < ActionDispatch::IntegrationTest

test "layout links" do
  get root_path
  assert_template 'static_pages/home'
  assert_select "a[href=?]", root_path, count: 2
  assert_select "a[href=?]", help_path
  assert_select "a[href=?]", about_path
  assert_select "a[href=?]", contact_path
  get signup_path
  assert_select "title", full_title("Sign up")
  end
end

补充：

1) 这是我正在做的教程：https://www.railstutorial.org/book/log_in_log_out

2) 这是错误引用的文件：

require 'test_helper'

class SiteLayoutTest < ActionDispatch::IntegrationTest

test "layout links" do
  get root_path
  assert_template 'static_pages/home'
  assert_select "a[href=?]", root_path, count: 2
  assert_select "a[href=?]", help_path
  assert_select "a[href=?]", about_path
  assert_select "a[href=?]", contact_path
  get signup_path
  assert_select "title", full_title("Sign up")
  end
end

如果我取出最后一个 assert_select，我就不会再收到错误了。

这是 application_helper：

module ApplicationHelper
  # Returns the full title on a per-page basis.
  def full_title(page_title = '')
    base_title = "Ruby on Rails Tutorial Sample App"
    if page_title.empty?
      base_title
    else
      page_title + " | " + base_title
    end
  end
end

非常感谢您的帮助。提前致谢！

Answer 1

我敢打赌，原因是您没有执行Listing 5.37 中的步骤，您在test_helper.rb 中包含ApplicationHelper：

class ActiveSupport::TestCase
  fixtures :all
  include ApplicationHelper
  .
  .
  .
end