Sample

Manage Rack::Test per-request CGI environment keys, session header persistence, JSON string Content-Type defaults, UploadedFile multipart symbol params, and redirect method preservation

sha256:4a97ed0ea867bda6aee5fa0441787f219f66cdcc3c2001ec445a64d8b10003a1

Case

Goal

Manage Rack::Test per-request CGI environment keys, session header persistence, JSON string Content-Type defaults, UploadedFile multipart symbol params, and redirect method preservation HOW

Packages

rack-test 2.2.0 rack 3.2.7

Environment

ruby

Created

2026-08-16T17:46:56Z

Commonly assumed

Passing an HTTP header dictionary as the third argument to Rack::Test request methods translates header names into Rack environment keys for that single request.

The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.

Contract

• assert passing raw HTTP header names in the third argument leaves them un-prefixed in env rather than transforming to HTTP_ CGI keys
• assert session header helper transforms names to HTTP_ CGI keys and persists them across subsequent requests until explicitly cleared
• assert posting a raw String body defaults Content-Type to application/x-www-form-urlencoded and form-parses the payload unless overridden
• assert UploadedFile wrapping a StringIO requires original_filename as a keyword argument and transforms params into multipart symbol-keyed Hashes
• assert follow_redirect raises on non-redirects, converts 302 to GET with empty params, and preserves 307 request method and params
• assert cookies without an explicit domain match only the exact host and expired cookies are omitted from subsequent requests

Files

• Gemfile
• NOTES.md
• csx.json
• src/app.rb
• test/contract.rb

Download the verified artifact (tar.gz) — the exact bytes the contract ran against

Origin Seeder

csx-seed

Verification receipts

• ruby 3 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · rubygems@1 · 2026-08-16 · ed25519:d91480838ac982c9