chore(rust): tag optional request body snippet tests as slow

[devin-ai-integration]

Description

@fern-api/rust-dynamic-snippets#test fails in CI whenever the turbo cache misses: two of the four tests in OptionalRequestBody.test.ts exceed vitest's 5s default timeout because each test builds a dynamic snippets generator that loads and parses respect-optional-request-body.json from disk. The test bodies take ~220ms locally, so the failure is cold-start/IO latency on the runner, not a behavior regression.

This tags the describe block with slow, the repo's existing convention (packages/configs/vitest/base.mjs gives that tag a 30s timeout), matching how packages/generator-cli handles its heavy-IO tests.

Changes Made

• describe("optional request body", { tags: ["slow"] }, ...) in generators/rust/dynamic-snippets/src/__test__/OptionalRequestBody.test.ts

No changelog: test-only, no generator output changes.

Testing

• CI=true npx vitest run src/__test__/OptionalRequestBody.test.ts in generators/rust/dynamic-snippets — 4 passed
• Failure being fixed: https://github.com/fern-api/fern/actions/runs/32487993242 (Error: Test timed out in 5000ms. at OptionalRequestBody.test.ts:32:5 and :44:5)

Link to Devin session: https://app.devin.ai/sessions/3783789dffe246c9871ebfbf25897445

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[github-actions]

SDK Generation Benchmark Results

Comparing PR branch against median of 5 nightly run(s) on main (latest: 2026-08-21T04:13:10Z).

Full benchmark table (click to expand)

Generator	Spec	main (generator)	main (E2E)	PR (generator)	Delta
rust-sdk	square	228s (n=5)	224s (n=5)	177s	-51s (-22.4%)

main (generator): generator-only time via --skip-scripts (includes Docker image build, container startup, IR parsing, and code generation — this is the same Docker-based flow customers use via fern generate). main (E2E): full customer-observable time including build/test scripts (nightly baseline, informational). Delta is computed against generator-only baseline.
⚠️ = generation exited with a non-zero exit code (timing may not reflect a successful run).
Baseline from nightly runs on main (latest: 2026-08-21T04:13:10Z). Trigger benchmark-baseline to refresh.
Last updated: 2026-08-21 15:20 UTC

[devin-ai-integration]

Superseded: main now carries the same { tags: ["slow"] } change (with an explanatory comment), so this branch rebases to an empty diff. Closing.

Written by Devin