---
phase: 05-tech-debt
plan: "03"
subsystem: testing
tags: [vitest, userEvent, testing-library, act-warnings, fake-timers]

# Dependency graph
requires:
  - phase: 05-tech-debt
    provides: "BackendSelectionStep and ReviewStep test infrastructure from Plans 01-02"
provides:
  - "act()-safe test interactions in BackendSelectionStep.test.tsx using userEvent v14"
  - "act()-safe timer handling in ReviewStep.test.tsx using vi.useFakeTimers()"
affects: [05-tech-debt, 06-new-backends, 07-validation-ux]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "userEvent.setup() + await user.click/type per test body (not module level)"
    - "vi.useFakeTimers() in beforeEach + vi.useRealTimers() in afterEach"

key-files:
  created: []
  modified:
    - src/components/wizard/BackendSelectionStep.test.tsx
    - src/components/wizard/ReviewStep.test.tsx

key-decisions:
  - "Replace fireEvent.click with await user.click (userEvent.setup() per test body) — eliminates act() wrapping requirement for async React Hook Form validation"
  - "Keep fireEvent.change for input value setting replaced by user.clear() + user.type() — user.type() appends so clear() first required"
  - "vi.useFakeTimers() in beforeEach freezes OutputBlock setTimeout(setCopied(false), 2000) preventing post-test act() warnings"

patterns-established:
  - "userEvent pattern: const user = userEvent.setup() inside it() body, never at module level"
  - "Fake timers pattern: vi.useFakeTimers() in beforeEach, vi.useRealTimers() in afterEach"

requirements-completed: [TECH-05]

# Metrics
duration: 3min
completed: 2026-03-30
---

# Phase 5 Plan 03: Act() Warning Elimination Summary

**Migrated BackendSelectionStep.test.tsx to userEvent v14 and added vi.useFakeTimers() to ReviewStep.test.tsx, eliminating all act() warnings from both test suites**

## Performance

- **Duration:** 3 min
- **Started:** 2026-03-30T07:40:33Z
- **Completed:** 2026-03-30T07:43:41Z
- **Tasks:** 2
- **Files modified:** 2

## Accomplishments
- Replaced all `fireEvent.click` / `fireEvent.change` calls in BackendSelectionStep.test.tsx with `userEvent.setup()` + `await user.click()` / `await user.type()`
- Added `vi.useFakeTimers()` to ReviewStep's `beforeEach` and `vi.useRealTimers()` to a new `afterEach` block
- Full suite: 104 tests passing across 12 test files with zero act() warnings and zero TypeScript errors

## Task Commits

Each task was committed atomically:

1. **Task 1: Migrate BackendSelectionStep.test.tsx from fireEvent to userEvent** - `9b6d8a8` (feat)
2. **Task 2: Fix ReviewStep act() warnings with vi.useFakeTimers** - `913cbe8` (feat)

**Plan metadata:** (docs commit — see final commit)

## Files Created/Modified
- `src/components/wizard/BackendSelectionStep.test.tsx` - Replaced fireEvent import with userEvent; 5 tests converted to async with userEvent.setup() pattern
- `src/components/wizard/ReviewStep.test.tsx` - Added afterEach to imports, vi.useFakeTimers() in beforeEach, new afterEach(() => vi.useRealTimers())

## Decisions Made
- Used `user.clear()` before `user.type()` in all input tests — userEvent.type() appends to existing value, so clear is required to avoid stale default values contaminating typed content
- Kept `fireEvent` removed entirely from BackendSelectionStep.test.tsx (not just partially replaced) — cleaner import, no risk of future misuse
- Added `vi.useFakeTimers()` to the existing `beforeEach` block (not a new one) per plan specification — avoids multiple beforeEach hooks

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None — both migrations were straightforward. All 10 BackendSelectionStep tests and all 15 ReviewStep tests passed on first run after migration.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- TECH-05 requirement satisfied: CI test output is now clean with zero act() warnings
- All 5 TECH-0x requirements (TECH-01 through TECH-05) are verified green in the full test suite
- Phase 05-tech-debt test infrastructure is fully act()-safe — patterns established for future test files in phases 6 and 7

---
*Phase: 05-tech-debt*
*Completed: 2026-03-30*

## Self-Check: PASSED

- `src/components/wizard/BackendSelectionStep.test.tsx` - FOUND
- `src/components/wizard/ReviewStep.test.tsx` - FOUND
- `.planning/phases/05-tech-debt/05-03-SUMMARY.md` - FOUND
- Commit `9b6d8a8` (Task 1) - FOUND
- Commit `913cbe8` (Task 2) - FOUND