test(opencode): add unit coverage for permission mapping helpers

[aaight]

Summary

• Adds tests/unit/backends/opencode-permissions.test.ts with 35 unit tests covering the three pure helper functions in src/backends/opencode/permissions.ts
• Tests verify allow/deny behavior for all five permission types: edit, bash, webfetch, external_directory, and doom_loop
• Asserts that unknown permission types always resolve to deny
• Includes integration-style tests that pipe buildPermissionConfig output directly into resolvePermissionDecision

Card: https://trello.com/c/nWKVcaVe/562-as-a-developer-i-want-unit-coverage-for-opencode-permission-mapping-so-that-tool-approval-behavior-stays-deterministic

Test plan

• buildPermissionConfig — covers default deny, capability-gated allow for edit/bash/webfetch, unconditional deny for doom_loop/external_directory
• normalizePermissionDecision — maps allow → always and deny → reject
• resolvePermissionDecision — per-type allow/deny routing for all five known types; unknown types resolve to deny
• Integration group — verifies the full buildPermissionConfig → resolvePermissionDecision pipeline
• vitest run --project unit-backends tests/unit/backends/opencode-permissions.test.ts passes (35/35)
• npm run lint — no errors
• npm run typecheck — no errors

🤖 Generated with Claude Code

🕵️ claude-code · claude-sonnet-4-6 · run details

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[nhopeatall]

LGTM — Clean, thorough unit test coverage for three small pure functions. Tests correctly mirror the source implementation in src/backends/opencode/permissions.ts, covering all five permission types across all three helpers plus an integration group that validates the pipeline. All 35 tests pass, CI is green, and the file follows existing test conventions in tests/unit/backends/.

🕵️ claude-code · claude-opus-4-6 · run details