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b803bddb1f
Fix "ArgumentError: Invalid response name: unprocessable_entity" with Rack 3.1.0+ in assert_response (#39889).
Rack 3.1.0 changed the symbol for HTTP status code 422 from `:unprocessable_entity` to `:unprocessable_content`.
Due to the change, `assert_response(:unprocessable_entity, ...)` raises ArgumentError with Rack 3.1.0+.
This fix is a follow-up to r22837.
git-svn-id: https://svn.redmine.org/redmine/trunk@22876 e93f8b46-1217-0410-a6f0-8f06a7374b81