使用 RSpec 如何测试救援异常块的结果

问题描述

我有一个方法，里面有一个开始/救援块.如何使用 RSpec2 测试救援块?

I have a method that has a begin / rescue block in it. How do I test the rescue block using RSpec2?

class Capturer

  def capture
    begin
      status = ExternalService.call
      return true if status == "200"
      return false
    rescue Exception => e
      Logger.log_exception(e)
      return false
    end
  end

end

describe "#capture" do
  context "an exception is thrown" do
    it "should log the exception and return false" do
      c = Capturer.new
      success = c.capture
      ## Assert that Logger receives log_exception
      ## Assert that success == false
    end
  end
end

推荐答案

使用 should_receive 和 should be_false:

context "an exception is thrown" do
  before do
    ExternalService.stub(:call) { raise Exception }
  end

  it "should log the exception and return false" do
    c = Capturer.new
    Logger.should_receive(:log_exception)
    c.capture.should be_false
  end
end

另请注意，您应该不从 Exception 中拯救，而是更具体的东西.Exception 涵盖了一切，这几乎绝对不是您想要的.最多你应该从 StandardError 中解救出来，这是默认的.

Also note that you should not be rescuing from Exception, but something more specific. Exception covers everything, which is almost definitely not what you want. At the most you should be rescuing from StandardError, which is the default.

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