如何记下rspec来测试救援块? [英] How to write down the rspec to test rescue block.?

问题描述

我有这样的方法

def className  
  def method_name
    some code  
  rescue  
    some code and error message  
  end  
end

那么，如何记下rspec来测试救援块??

So, How to write down the rspec to test rescue block..?

推荐答案

如果您想营救，则意味着您希望some code引发某种异常.

If you want to rescue, it means you expect some code to raise some kind of exception.

您可以使用 RSpec存根伪造实现并强行执行错误.假设执行块包含一个可能引发的方法

You can use RSpec stubs to fake the implementation and force an error. Assuming the execution block contains a method that may raise

def method_name
  other_method_that_may_raise
rescue => e
  "ERROR: #{e.message}"
end

在您的规范中将存根链接到该方法

hook the stub to that method in your specs

it " ... " do
  subject.stub(:other_method_that_may_raise) { raise "boom" }
  expect { subject.method_name }.to_not raise_error
end

您还可以通过测试结果来检查救援人员

You can also check the rescue handler by testing the result

it " ... " do
  subject.stub(:other_method_that_may_raise) { raise "boom" }
  expect(subject.method_name).to eq("ERROR: boom")
end

不用说，您应该提出一个可能由实际实现引发的错误，而不是一般性错误

Needless to say, you should raise an error that it's likely to be raised by the real implementation instead of a generic error

{ raise FooError, "boom" }

，并假设与此相关，则仅营救该Error.

and rescue only that Error, assuming this is relevant.

作为旁注，在Ruby中，您定义了一个类:

As a side note, in Ruby you define a class with:

class ClassName

不是

def className

如您的示例.

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