ruby-on-rails - 如何 rspec 模拟 ruby​​ rails 记录器类

Question

嗨，我正在尝试 rspec 模拟以下类:

    class Person
      def initialize(personid)
        Rails.logger.debug "Creating person with id #{personid}"
      end
    end

使用这个:

require 'spec_helper'
  describe Person do
    describe "#initialize" do
      let(:rails_mock) { double("Rails").as_null_object }
      let(:logger_mock) { double("Rails.logger").as_null_object }

      it "logs a message" do
        rails_mock.stub(:logger).and_return(logger_mock)
        logger_mock.should_receive(:debug)
        Person.new "dummy"
      end
   end
end

并收到此消息:

RSpec::Mocks::MockExpectationError: (Double "Rails.logger").debug(any args)
expected: 1 time
received: 0 times

任何帮助都会很棒!

Answer 1

我会:

Rails.stub_chain(:logger, :debug).and_return(logger_mock)

不要忘记在测试结束时取消 stub :

Rails.unstub(:logger)