ruby-on-rails - 如何在 RSpec 中 stub 错误异常？

Question

当它进入异常部分以遵循“.get”方法时，我不确定如何进行测试:

/api/reddit_client.rb:

module Api
    class RedditClient

      def self.get(path, access_token)
        begin
          response = RestClient.get(
            path,
            { :Authorization => "Bearer #{access_token}" }
          )

          json_parse(response)
        rescue RestClient::ExceptionWithResponse => e
          logger.error "%%% Something went wrong in request post"
          logger.error "%%% It fails with error: #{e.http_code}"
          logger.error "%%% And with message: #{e.message}"

          { "message" => e.message, "error" => e.http_code }
        end
      end

      ...
      ...
      ...

        private

        def json_parse(response)
          JSON.parse(response.body)
        end
    end
end

我希望它测试它是否引发“RestClient::ExceptionWithResponse”，为此我执行了以下操作:

/api/reddit_client_spec.rb:

require 'rails_helper'

RSpec.describe Api::RedditClient do
    let(:path) { 'https://www.somerandomapi.com' }
    let(:access_token) { 'f00TOk3N' }

    describe '.get' do
      subject { described_class.get(path, access_token)}

      context 'when not authorized' do
        before do
          allow(described_class)
            .to receive(:get)
            .and_raise(RestClient::ExceptionWithResponse)
        end

        it 'returns hash with error infos' do
          expect{ subject }.to raise_error(RestClient::ExceptionWithResponse)
        end
      end
    end
end

欺骗我的是，我还想测试 Rails.logger.error 是否也被调用了 3 次，并检查我的哈希错误返回值。如何测试这种情况？

Answer 1

为了检查 Rails logger 是否被调用了 3 次不同的消息，您可以结合使用 receive 和 ordered 方法。

还使用 RestClient 而不是 Api::RedditClient 来执行该方法并捕获异常。

你的代码将是这样的:

 context 'when not authorized' do
   before do
     allow(RestClient) # <- Note that you should use RestClient instead of Api::RedditClient 
       .to receive(:get)
       .and_raise(RestClient::ExceptionWithResponse)
   end

   it 'should raise error' do
     expect(Rails.logger).to receive(:error).with("%%% Something went wrong in request post").ordered
     expect(Rails.logger).to receive(:error).with(""%%% It fails with error: 401"").ordered
     expect(Rails.logger).to receive(:error).with("%%% And with message: Exception Message").ordered
     
     expect{ subject }.to raise_error(RestClient::ExceptionWithResponse)
   end
 end

要检查返回响应，您可以在测试中挽救异常并检查返回类型

it 'returns hash with error infos' do
   expect{ subject rescue nil}.to include({ "message" => "Exception Message", "error" => 401 })
end

希望对你有帮助