---
phase: 03-visual-flattening
plan: 02
subsystem: testing
tags: [swift-testing, itinerary, flattening, determinism]

# Dependency graph
requires:
  - phase: 03-visual-flattening
    plan: 01
    provides: ItineraryFlattener.flatten() pure function
provides:
  - 13 tests verifying ItineraryFlattener determinism
  - 3 success criteria tests mapping to ROADMAP requirements
affects: [04-drag-drop]

# Tech tracking
tech-stack:
  added: []
  patterns: [success-criteria-test-naming, integration-style-testing]

key-files:
  created:
    - SportsTimeTests/Domain/ItineraryFlattenerTests.swift
  modified: []

key-decisions:
  - "success_* prefix for tests mapping to ROADMAP success criteria"
  - "Integration tests use realistic multi-day trip configurations"
  - "Test helpers create minimal mock data matching production types"

patterns-established:
  - "success_negativeSortOrderAppearsBeforeGames: Tests negative sortOrder positioning"
  - "success_sameStateProducesIdenticalOrder: Tests determinism guarantee"
  - "success_reorderPreservesNewOrder: Tests persistence after sortOrder change"

# Metrics
duration: 15min
completed: 2026-01-18
---

# Phase 3 Plan 2: Flattening Tests Summary

**13 tests verifying ItineraryFlattener produces deterministic, sortOrder-based output with explicit ROADMAP success criteria coverage**

## Performance

- **Duration:** 15 min
- **Started:** 2026-01-18T21:59:19Z
- **Completed:** 2026-01-18T22:13:59Z
- **Tasks:** 2
- **Tests added:** 13

## Accomplishments

- Created `ItineraryFlattenerTests.swift` with comprehensive test coverage
- 3 success criteria tests mapping directly to ROADMAP requirements
- 6 comprehensive coverage tests for edge cases
- 4 integration tests for realistic trip data configurations
- All tests pass, full test suite confirms no regressions

## Task Commits

Each task was committed atomically:

1. **Task 1: Create ItineraryFlattenerTests** - `378e0ad` (test)
2. **Task 2: Add integration tests** - `724b9f8` (test)

## Files Created

- `SportsTimeTests/Domain/ItineraryFlattenerTests.swift` - 765 lines, 13 tests

## Success Criteria Verification

The three ROADMAP success criteria now have explicit tests:

| Success Criterion | Test Name |
|-------------------|-----------|
| Negative sortOrder before games | `success_negativeSortOrderAppearsBeforeGames` |
| Deterministic flattening | `success_sameStateProducesIdenticalOrder` |
| Reorder preserves position | `success_reorderPreservesNewOrder` |

## Test Coverage

### Success Criteria Tests (3)
- `success_negativeSortOrderAppearsBeforeGames` - Item with sortOrder -1.0 appears before noon game
- `success_sameStateProducesIdenticalOrder` - Repeated flatten produces identical row IDs
- `success_reorderPreservesNewOrder` - Changed sortOrder results in new order after reflatten

### Comprehensive Coverage Tests (6)
- `flatten_dayHeaderAlwaysFirst` - Day header is structural anchor
- `flatten_sortsByDayThenSortOrder` - Items grouped by day, sorted within
- `flatten_gamesGetSortOrderFromTime` - 8pm game after item with sortOrder 500
- `flatten_gamesGetSortOrderFromTime_earlyGame` - 1pm game before item with sortOrder 1000
- `flatten_emptyDayHasOnlyHeader` - Rest day produces only header row
- `flatten_multipleGamesOnSameDay` - Multiple games in single games row

### Integration Tests (4)
- `flatten_travelWithNegativeSortOrderAppearsBeforeGames` - Travel at -5.0 before games
- `flatten_travelWithPositiveSortOrderAppearsAfterGames` - Travel at 1500.0 after games
- `flatten_mixedItemTypes` - Complex day with exact order verification
- `flatten_multiDayTrip` - 3-day trip with different configurations per day

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Phase 3 Complete

Phase 3 (Visual Flattening) is now complete:
- Plan 1: Created ItineraryFlattener pure utility
- Plan 2: Added comprehensive test coverage

Phase 4 (Drag-Drop) can now build on the verified, deterministic flattening behavior.

---
*Phase: 03-visual-flattening*
*Completed: 2026-01-18*