• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

Resolves:

WARNING: Shared example group 'reinstall_pkgconf_if_needed' has been previously defined at:
  /opt/homebrew/Library/Homebrew/test/cmd/shared_examples/reinstall_pkgconf_if_needed_spec.rb:7
...and you are now defining it at:
  /opt/homebrew/Library/Homebrew/test/cmd/shared_examples/reinstall_pkgconf_if_needed_spec.rb:7
The new definition will overwrite the original one.

and other problematic use of rspec