[rspec] Structs and expect(o).to receive(:method)

[Jack Royal-Gordon]

I’m seeing unusual behavior when i place an "expect().to receive” on an element 
of a struct. Specifically, with the following code:

  describe 'test example of struct' do
    let!(:subscription) { Sub = Struct.new(:canceled_at) ; Sub.new(canceled_at: 
2.weeks.from_now) }

    it 'behaves okay with no expectation set' do 
      value = 2.weeks.ago
      subscription.canceled_at = value
      puts subscription.inspect
      expect(subscription.canceled_at).to eq value
    end
    
    it 'misbehaves if I place an expecation on the element' do
      expect(subscription).to receive(:canceled_at)
      value = 2.weeks.ago
      subscription.canceled_at = value
      puts subscription.inspect
      expect(subscription.canceled_at).to eq value
    end
  end

Here is the result of running those examples:

Run options: include 
{:locations=>{"./spec/models/user/stripe_customer_spec.rb"=>[362]}}
#<struct Sub canceled_at=Thu, 11 Feb 2021 21:24:19 UTC +00:00>
./Users/jackrg/Documents/Novelty-Stats/spec/models/user/stripe_customer_spec.rb:363:
 warning: already initialized constant Sub
/Users/jackrg/Documents/Novelty-Stats/spec/models/user/stripe_customer_spec.rb:363:
 warning: previous definition of Sub was here
#<struct Sub canceled_at=Thu, 11 Feb 2021 21:24:19 UTC +00:00>
F

Failures:

  1) User::StripeCustomer test example of struct misbehaves if I place an 
expecation on the element
     Failure/Error: expect(subscription.canceled_at).to eq value
     
       expected: 2021-02-11 21:24:19.601491000 +0000
            got: nil
     
       (compared using ==)
     # ./spec/models/user/stripe_customer_spec.rb:377:in `block (3 levels) in 
<top (required)>'

Finished in 0.0432 seconds (files took 7.91 seconds to load)
2 examples, 1 failure


The only difference between the two examples is the addition of the highlights 
line in the second example. That expectation causes the retrieval process to 
not work, returning nil instead of the current value (or even the initial 
value).

Is this a known issue? I can’t find it documented anywhere.

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