test(cli): warm plugin import pipeline and share plugin fixture

[kilo-code-bot]

Summary

Alternative fix for the spurious Windows failures in packages/opencode/test/provider/provider.test.ts (see #9566 for the root-cause fix in Provider.layer).

The two failing tests each wrote a unique .opencode/plugin/*.ts file into a fresh tmp dir and triggered a cold Bun TS import(). On Windows that cold transpile exceeded the 30 s per-test ceiling.

• Add a shared plugin fixture at test/fixture/plugins/config-mutator.ts that accepts tuple options to mutate provider, enabled_providers, and disabled_providers. The two tests now reference this single file via config.plugin, so Bun's module cache short-circuits after the first import.
• Warm Bun's TS import pipeline by import()ing the fixture once during test/preload.ts so the first plugin-loading test does not pay the full cold-start cost.

Why not the other approach

This is a pure test-infrastructure change -- it does not touch src/ and does not alter runtime behavior. #9566 changes Provider.layer ordering; this PR is the safer alternative when the ordering fix is not desirable.

How to test

cd packages/opencode && bun run test test/provider/provider.test.ts

Provider test file drops from ~88 s to ~46 s locally and both plugin tests complete inside the 30 s per-test ceiling.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• packages/opencode/test/fixture/plugins/config-mutator.ts
• packages/opencode/test/preload.ts
• packages/opencode/test/provider/provider.test.ts

---

_{Reviewed by gpt-5.4-2026-03-05 · 404,915 tokens}