使用RSpec我如何测试救援异常块的结果

Question

我有一个方法，其中有一个开始/救援块。如何使用RSpec2测试救援块？

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 

另外请注意，您应该不从Exception抢救，但更具体的东西。 Exception涵盖一切，这几乎绝对不是你想要的。最多你应该从StandardError救出，这是默认设置。