---
phase: 20-unit-integration-tests
plan: 02
subsystem: testing
tags:
  [
    swift-testing,
    subtitle-chunker,
    sentence-splitter,
    word-timing,
    integration-test,
  ]

requires:
  - phase: 18-test-infrastructure
    provides: CompanionCore test target, swift-testing dependency, existing SubtitleChunkerTests
provides:
  - Expanded SubtitleChunker unit tests covering break priority, font size variants, page integrity, and width measurement
  - Streaming pipeline integration tests verifying SentenceSplitter -> SubtitleChunker -> WordTimingAligner chain
affects: [future-chunker-changes, subtitle-pipeline-refactoring]

tech-stack:
  added: []
  patterns:
    [integration-test-with-mock-durations, pipeline-sequencing-verification]

key-files:
  created:
    - plugins/claude-tts-companion/Tests/CompanionCoreTests/StreamingPipelineTests.swift
  modified:
    - plugins/claude-tts-companion/Tests/CompanionCoreTests/SubtitleChunkerTests.swift

key-decisions:
  - "Used closure syntax for whereSeparator instead of key path to satisfy Swift 6 type inference in test context"

patterns-established:
  - "Pipeline integration test pattern: real components + mock audio durations, no mocking pipeline internals"

requirements-completed: [TEST-02, TEST-05]

duration: 3min
completed: 2026-03-28
---

# Phase 20 Plan 02: SubtitleChunker + Streaming Pipeline Tests Summary

**Expanded SubtitleChunker to 14 tests (break priority, font sizes, page integrity, width measurement) and added 5 streaming pipeline integration tests verifying SentenceSplitter -> SubtitleChunker -> WordTimingAligner chain**

## Performance

- **Duration:** 3 min
- **Started:** 2026-03-28T02:23:24Z
- **Completed:** 2026-03-28T02:26:14Z
- **Tasks:** 2
- **Files modified:** 2

## Accomplishments

- SubtitleChunker tests expanded from 5 to 14 methods covering break priority logic (clause/phrase/regular), font size variants (small/medium/large page counts), page contiguity, single-word overflow, and measureWidth scaling
- New StreamingPipelineTests.swift with 5 integration tests exercising real SentenceSplitter -> SubtitleChunker -> WordTimingAligner chain with mock audio durations
- All 84 project tests pass with zero regressions

## Task Commits

Each task was committed atomically:

1. **Task 1: Expand SubtitleChunker tests** - `f7975d19` (test)
2. **Task 2: Streaming pipeline integration test** - `6498ffcd` (test)

## Files Created/Modified

- `plugins/claude-tts-companion/Tests/CompanionCoreTests/SubtitleChunkerTests.swift` - Added 9 new test methods for break priority, font size, page integrity, width measurement
- `plugins/claude-tts-companion/Tests/CompanionCoreTests/StreamingPipelineTests.swift` - New integration test file with 5 tests for streaming pipeline sequencing

## Decisions Made

- Used closure syntax `{ $0.isWhitespace }` instead of key path `\.isWhitespace` for `whereSeparator` in test file because Swift 6 could not infer the key path root type in the test context

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Added Foundation import for TimeInterval type**

- **Found during:** Task 2 (StreamingPipelineTests)
- **Issue:** `TimeInterval` not in scope without Foundation import
- **Fix:** Added `import Foundation` to StreamingPipelineTests.swift
- **Verification:** Build compiles and all tests pass
- **Committed in:** 6498ffcd (Task 2 commit)

**2. [Rule 3 - Blocking] Fixed key path type inference for whereSeparator**

- **Found during:** Task 2 (StreamingPipelineTests)
- **Issue:** Swift 6 could not infer key path root type for `\.isWhitespace` in test context
- **Fix:** Changed to closure syntax `{ $0.isWhitespace }`
- **Verification:** Build compiles and all tests pass
- **Committed in:** 6498ffcd (Task 2 commit)

---

**Total deviations:** 2 auto-fixed (2 blocking)
**Impact on plan:** Both were compilation fixes required for the test to build. No scope creep.

## Issues Encountered

None beyond the auto-fixed blocking issues above.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- All SubtitleChunker and streaming pipeline test coverage goals met
- 84 total tests passing across the project
- Ready for any subsequent test or refactoring phases

## Self-Check: PASSED

All files exist on disk and all commit hashes found in git log.

---

_Phase: 20-unit-integration-tests_
_Completed: 2026-03-28_
