Reduce sandboxing to prevent swallowed deprecations #2857
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JonRowe
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Aug 8, 2025
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I'm on the fence as to which is better, sandboxing examples we know are examples or just everything, but we should at least extend the sandboxed config to not swallow output... |
We used to sandbox everything, but it turns out that deprecations were swallowed, as the temporary config has no deprecation stream set, or stderr is masked.
RuntimeError:
Warnings were generated: /home/runner/work/rspec-rails/rspec-rails/lib/rspec/rails/matchers/have_http_status.rb:219: warning: Status code :unprocessable_entity is deprecated and will be removed in a future version of Rack. Please use :unprocessable_content instead.
Alternatively, we can set sandbox_config.deprecation_stream = real_deprecation_stream but this seems unnecessary.
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We used to sandbox everything, but it turns out that deprecations (
RSpec.deprecate("anything")) were swallowed, as the temporary config has no deprecation stream set, or stderr is masked.Found here #2849 (comment)
We're almost back to square one with deprecations as we were before #2365
However, I'm not entirely happy with this approach. We still mute deprecations for those Rails-related example group specs and a few others, and there are chances deprecations will pop up there eventually.
❓ Would it be better to replay the configuration block on top of the sandboxed configuration? Probably not, and it might not work if stderr is intercepted.
Please consider this WIP