RSpec - 测试强参数 ActionController::ParameterMissing [英] RSpec - Testing Strong Parameters ActionController::ParameterMissing

问题描述

如何测试某个操作是否引发了 ActionController::ParameterMissing 异常?

How can one test if a certain action raises an ActionController::ParameterMissing exception?

例如:

it "raises an exception" do
  post :create, {}
  expect(response).to raise ActionController::ParameterMissing
end

以上似乎不起作用，它会因 ActionController::ParameterMissing 异常而导致测试失败.

The above does not seem to work, it will fail the test with the ActionController::ParameterMissing exception.

推荐答案

使用 expect 块语法使用 raise_error 匹配器:

Use the expect block syntax using the raise_error matcher:

it "raises an exception" do
  expect{ post(:create, {}) }.to raise_error ActionController::ParameterMissing
end

您的代码不起作用的原因是 post(:create, {}) 引发了异常.这发生在 expect(response).to ... 代码执行之前.由于 #post 消息不在 begin...end 块中，引发的异常被传递给 RSpec 测试失败.

The reason that your code doesn't work is that post(:create, {}) raises the exception. This happens before the expect(response).to ... code gets executes. Since the #post message is not in a begin...end block, the raised exception is passed up to RSpec failing the test.

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