Ruby-on-rails 如何在 Rails/RSpec 中测试异常引发？
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How to test exception raising in Rails/RSpec?
提问by malcoauri
There is the following code:
有以下代码：
def index
@car_types = car_brand.car_types
end
def car_brand
CarBrand.find(params[:car_brand_id])
rescue ActiveRecord::RecordNotFound
raise Errors::CarBrandNotFound.new
end
I want to test it through RSpec. My code is:
我想通过 RSpec 测试它。我的代码是：
it 'raises CarBrandNotFound exception' do
get :index, car_brand_id: 0
expect(response).to raise_error(Errors::CarBrandNotFound)
end
CarBrand with id equaling 0 doesn't exist, therefore my controller code raises Errors::CarBrandNotFound, but my test code tells me that nothing was raised. How can I fix it? What do I wrong?
id 等于 0 的 CarBrand 不存在，因此我的控制器代码引发 Errors::CarBrandNotFound，但我的测试代码告诉我没有引发任何问题。我该如何解决？我怎么了？
回答by Jakob S
In order to spec error handling, your expectations need to be set on a block; evaluating an object cannot raise an error.
为了规范错误处理，您需要在块上设置您的期望；评估对象不会引发错误。
So you want to do something like this:
所以你想做这样的事情：
expect {
get :index, car_brand_id: 0
}.to raise_error(Errors::CarBrandNotFound)
See Expect errorfor details.
有关详细信息，请参阅预期错误。
I am a bit surprised that you don't get any exception bubbling up to your spec results, though.
不过，我有点惊讶的是，您没有收到任何与规范结果相关的异常。
回答by kaleb4eg
Use expect{}instead of expect().
使用expect{}代替expect()。
回答by BroiSatse
get :indexwill never raise an exception - it will rather set response to be an 500 error some way as a real server would do.
get :index永远不会引发异常 - 它会像真实服务器那样以某种方式将响应设置为 500 错误。
Instead try:
而是尝试：
it 'raises CarBrandNotFound exception' do
controller.params[:car_brand_id] = 0
expect{ controller.car_brand }.to raise_error(Errors::CarBrandNotFound)
end
