The custom RSpec matchers they use raises the following deprecation
warning
```
Using `stub` from rspec-mocks' old `:should` syntax without explicitly enabling the syntax is deprecated. Use the new `:expect` syntax or explicitly enable `:should` instead. Called from /home/runner/work/openfoodnetwork/openfoodnetwork/spec/support/matchers/delegate_matchers.rb:22:in `block (2 levels) in <top (required)>'.
```
It's not worth maintaining those matchers to test such
implementation-related thing. Whether or not any delegations work is
something that will be caught by integration tests or directly stubbing
the collaborator object's methods.
This stems from
https://github.com/openfoodfoundation/openfoodnetwork/pull/6902.