noosfero | Improvements on template mirror blocks behaviour (#763)

[Rodrigo Souto]

New comment for Merge Request 763

https://gitlab.com/noosfero/noosfero/merge_requests/763#note_3272505


Rodrigo Souto

I'd prefer if you test the destruction of the block explicitly. Testing only the count difference may hide bugs (it might be destroying other block instead of the right one). So do something like (pseudo-code):
```
template_block = Block.create ...
mirror_block = Block.create ...
template_block.observers << mirror_block

template_block.destroy!

assert_nil template_block.reload  # When you reload an object that was destroyed it returns nil
```

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