使用RSpec我如何測試救援異常塊的結果

Question

我有一個方法，其中有一個開始/救援塊。如何使用RSpec2測試救援塊？

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 

Answer 1

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 

另外請注意，您應該不從Exception搶救，但更具體的東西。 Exception涵蓋一切，這幾乎絕對不是你想要的。最多你應該從StandardError救出，這是默認設置。