# Mock To Internals Migration > mock-to-internals-migration - Skill: `zaxbyhub/mock-to-internals-migration-2` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add zaxbyhub/mock-to-internals-migration-2` - Raw SKILL.md: https://api.skillmd.com/api/skills/zaxbyhub/mock-to-internals-migration-2/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: zaxbyhub (https://skillmd.com/u/zaxbyhub) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/zaxbyhub/mock-to-internals-migration-2 --- # mock-to-internals-migration ## Trigger - vitest to bun mock - mock-to-internals - _internals seam ## Required Procedure - mirror existing opt-in pattern: separate tool map constant, conditional merge in agents/index.ts, gating tests verifying disabled and enabled states - run barrel-import-dependent tests after modifying barrel exports - audit code structure integrity before editing a file that was recently refactored or extracted - grep for all vi.fn(), vi.spyOn(), vi.mock() in converted files before declaring conversion complete - spread real module exports as base of every mock.module return object - Load .opencode/skills/writing-tests/SKILL.md before touching any test file - run lint check (e.g. bun run lint or equivalent) as part of pre-submit verification, not just build - check for existing wrapper patterns before applying sandbox wrapping - design command-transformation pipelines as idempotent passes, not stacking layers - run tests on the unmodified codebase before starting to establish a failure baseline ## Forbidden Shortcuts - invent new tool-gating mechanisms for opt-in feature flags - label post-change test failures as 'pre-existing' without running tests before the change ## Delegation Template When delegating a task affected by this skill, include: ``` SKILLS: file:.opencode/skills/generated/mock-to-internals-migration/SKILL.md ``` ## Reviewer Checks - grep for import-from-barrel patterns in test files and run affected tests after barrel changes - grep for mock.module patterns that lack ...realModule spread - grep for mock.module calls to confirm they spread real exports - confirm bun:test isolation patterns match skill guidelines - verify wrapCommand idempotency by calling it twice on the same command and confirming output equals single-call output - Run `git diff .. --name-only` and confirm file presence before marking introduced_by_pr: YES or NO ## Test Engineer Checks - Add or update tests covering the trigger condition and the forbidden shortcut.