Testing return value after raising an exception

[Carlos Rodriguez]

Hello folks, 

I'm trying to test the return value of a method after an exception is called and I'm unsure of how to actually test this. I basically want to throw away the exception to see the return value. See the super contrived example below:

class Foo

  def call

    Bar.new.call

  end

end

class Bar

  def call

    Meep.new.call

  end

end

class Meep

  def call

    "no error"

  rescue ArgumentError

    "error"

  end

end

allow_any_instance_of(Meep).to receive(:call).and_raise(ArgumentError)

expect(Foo.new.call).to eq "error"

[Myron Marston]

Hi Carlos,

It’s not clear to me what you’re trying to accomplish with that example. Meep#call has a rescue clause but the code being rescued involves no method calls ("no error" is not a method call) and, barring something truly bizarre like a busted ruby installation, cannot raise any sort of exception. As there’s no possibility of an ArgumentError being raised, there’s no point in rescuing it (or in trying to write a test to cover the possibility of an exception being raised).

In addition, allow_any_instance_of(Meep).to receive(:call).and_raise(ArgumentError) completely replaces your existing implementation of Meep#call including the rescue ArgumentError.

I’m not sure what to suggest since your example doesn’t make sense to me.

Myron

​

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[Jon Rowe]

Hi Carlos

You need to stub a method within your definition of call that will raise an error, like Myron points out currently you are overwriting your definition and so the rescue has no effect.

Cheers

Jon

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