---
phase: 18-api-route-tests
plan: 02
subsystem: testing
tags: [vitest, api-routes, llm, google-genai, openai, mocking]

# Dependency graph
requires:
  - phase: 18-01
    provides: API route testing patterns with fs mocking
provides:
  - LLM route tests for Google and OpenAI providers
  - @google/genai class mocking pattern with vi.hoisted
  - fetch mocking for OpenAI API calls
affects: [18-03, 18-04]

# Tech tracking
tech-stack:
  added: []
  patterns: [es6-class-mocking-with-hoisted, fetch-mocking-for-api]

key-files:
  created:
    - src/app/api/llm/__tests__/route.test.ts
  modified: []

key-decisions:
  - "Use vi.hoisted() for ES6 class mocks that need to work with 'new' keyword"
  - "Mock global.fetch for external HTTP API calls (OpenAI)"

patterns-established:
  - "ES6 class mocking: vi.hoisted() to define mock class, return from vi.mock factory"
  - "External API mocking: global.fetch with conditional responses per test"

issues-created: []

# Metrics
duration: 4 min
completed: 2026-01-13
---

# Phase 18 Plan 02: LLM Route Tests Summary

**LLM API route tests for Google (18 tests) and OpenAI providers with ES6 class and fetch mocking**

## Performance

- **Duration:** 4 min
- **Started:** 2026-01-13T14:51:00Z
- **Completed:** 2026-01-13T14:55:00Z
- **Tasks:** 2
- **Files modified:** 1

## Accomplishments
- Created 18 tests for /api/llm route covering both providers
- Established ES6 class mocking pattern using vi.hoisted() for GoogleGenAI
- Established fetch mocking pattern for OpenAI API calls
- Covered success, validation, rate limits, and API error paths

## Task Commits

Each task was committed atomically:

1. **Task 1: Create LLM route tests for Google provider** - `6666b92` (test)
2. **Task 2: Add LLM route tests for OpenAI provider** - `8ba3a71` (test)

**Plan metadata:** (this commit)

## Files Created/Modified
- `src/app/api/llm/__tests__/route.test.ts` - 18 tests covering Google and OpenAI providers

## Decisions Made
- Used vi.hoisted() for ES6 class mocks to properly support instantiation with 'new'
- Mock global.fetch for OpenAI API calls rather than mocking fetch library

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Fixed ES6 class mock pattern**
- **Found during:** Task 1 (Google provider tests)
- **Issue:** Initial mock using vi.fn() with factory function did not work with 'new' keyword
- **Fix:** Used vi.hoisted() to define proper ES6 class mock for GoogleGenAI
- **Files modified:** src/app/api/llm/__tests__/route.test.ts
- **Verification:** Tests pass with hoisted class mock
- **Committed in:** 6666b92

---

**Total deviations:** 1 auto-fixed (1 blocking), 0 deferred
**Impact on plan:** Auto-fix necessary for class mocking to work. No scope creep.

## Issues Encountered
None - plan executed successfully.

## Next Phase Readiness
- ES6 class mocking pattern established for Gemini SDK
- fetch mocking pattern ready for provider API calls
- Ready for 18-03 (Generate route Gemini tests)

---
*Phase: 18-api-route-tests*
*Completed: 2026-01-13*