Ruby on rails 3 预计将引发_错误，测试将失败，因为它会引发此错误

我有一个简单的测试用例：

it "is removed when associated board is deleted" do
  link = FactoryGirl.create(:link)
  link.board.destroy
  expect(Link.find(link.id)).to raise_error ActiveRecord::RecordNotFound
end

并且输出失败：

1) Link is removed when associated board is deleted
   Failure/Error: expect(Link.find(link.id)).to raise_error ActiveRecord::RecordNotFound
   ActiveRecord::RecordNotFound:
     Couldn't find Link with id=1
   # ./spec/models/link_spec.rb:47:in `block (2 levels) in <top (required)>'

1）删除关联板时，链接被删除
失败/错误：预期（Link.find（Link.id））。引发_错误ActiveRecord:：RecordNotFound
ActiveRecord:：RecordNotFound:
找不到id为1的链接
#./spec/models/link_spec.rb:47:in'block（2层）in'

---

知道为什么吗？

要捕获错误，需要将代码包装在块中。您的代码正在不应出现错误的范围内执行

Link.find（Link.id）

。正确测试：

it "is removed when associated board is deleted" do
  link = FactoryGirl.create(:link)
  link.board.destroy
  expect { Link.find(link.id) }.to raise_error ActiveRecord::RecordNotFound
end