---
phase: 18-companioncore-library-test-infrastructure
verified: 2026-03-28T01:25:00Z
status: passed
score: 6/6 must-haves verified
re_verification: false
---

# Phase 18: CompanionCore Library & Test Infrastructure Verification Report

**Phase Goal:** All business logic is testable via `swift test` through a library target extraction
**Verified:** 2026-03-28T01:25:00Z
**Status:** PASSED
**Re-verification:** No — initial verification

## Goal Achievement

### Observable Truths

| #   | Truth                                                                                                      | Status   | Evidence                                                                                   |
| --- | ---------------------------------------------------------------------------------------------------------- | -------- | ------------------------------------------------------------------------------------------ |
| 1   | All business logic lives in CompanionCore library target, not the executable                               | VERIFIED | 27 files in `Sources/CompanionCore/`, only `main.swift` in `Sources/claude-tts-companion/` |
| 2   | main.swift is the only file in the executable target                                                       | VERIFIED | `ls Sources/claude-tts-companion/` → `main.swift` only; confirmed by bash check            |
| 3   | swift build succeeds with the new library + executable + test target structure                             | VERIFIED | `swift build` → `Build complete! (1.40s)` with zero errors                                 |
| 4   | swift test runs and passes with unit tests for five pure types                                             | VERIFIED | `swift test` → `Test run with 30 tests passed after 0.152 seconds`                         |
| 5   | @testable import CompanionCore works in the test target                                                    | VERIFIED | All five test files open with `@testable import CompanionCore`; tests compile and run      |
| 6   | LanguageDetector, SubtitleChunker, TelegramFormatter, TranscriptParser, and CircuitBreaker each have tests | VERIFIED | 4 + 5 + 7 + 8 + 6 = 30 passing tests across the five types                                 |

**Score:** 6/6 truths verified

### Required Artifacts

| Artifact                                                                             | Expected                                                    | Status   | Details                                                                                                        |
| ------------------------------------------------------------------------------------ | ----------------------------------------------------------- | -------- | -------------------------------------------------------------------------------------------------------------- |
| `plugins/claude-tts-companion/Package.swift`                                         | Three-target SwiftPM manifest (CompanionCore + exec + test) | VERIFIED | Contains `.target(name: "CompanionCore"`, `.executableTarget`, `.testTarget(name: "CompanionCoreTests"`        |
| `plugins/claude-tts-companion/Sources/CompanionCore/CompanionApp.swift`              | Coordinator facade with public init/start/shutdown          | VERIFIED | `public final class CompanionApp`, `@MainActor public init()`, `public func start()`, `public func shutdown()` |
| `plugins/claude-tts-companion/Sources/claude-tts-companion/main.swift`               | Ultra-thin entry point (42 lines)                           | VERIFIED | 42 lines; contains `import CompanionCore`, `CompanionApp()`, no subsystem wiring                               |
| `plugins/claude-tts-companion/Tests/CompanionCoreTests/LanguageDetectorTests.swift`  | Language detection tests for English and CJK                | VERIFIED | `@testable import CompanionCore`, 4 `@Test` functions                                                          |
| `plugins/claude-tts-companion/Tests/CompanionCoreTests/SubtitleChunkerTests.swift`   | Subtitle page chunking tests with @MainActor                | VERIFIED | `@Suite(.serialized) @MainActor`, 5 `@Test` functions                                                          |
| `plugins/claude-tts-companion/Tests/CompanionCoreTests/TelegramFormatterTests.swift` | HTML formatting and chunking tests                          | VERIFIED | `@testable import CompanionCore`, 7 `@Test` functions                                                          |
| `plugins/claude-tts-companion/Tests/CompanionCoreTests/TranscriptParserTests.swift`  | JSONL transcript parsing tests                              | VERIFIED | `@testable import CompanionCore`, 8 `@Test` functions including file-based test                                |
| `plugins/claude-tts-companion/Tests/CompanionCoreTests/CircuitBreakerTests.swift`    | Circuit breaker state machine tests                         | VERIFIED | `CircuitBreaker(maxFailures:`, `cb.recordFailure()`, `cb.isOpen`, 6 `@Test` functions                          |

### Key Link Verification

| From                               | To                       | Via                                               | Status | Details                                                                                |
| ---------------------------------- | ------------------------ | ------------------------------------------------- | ------ | -------------------------------------------------------------------------------------- |
| `main.swift`                       | `CompanionApp`           | `import CompanionCore` + `CompanionApp()`         | WIRED  | `main.swift` line 2: `import CompanionCore`; line 18: `let companion = CompanionApp()` |
| `Package.swift`                    | `Sources/CompanionCore/` | `.target(name: "CompanionCore")`                  | WIRED  | Package.swift line 17-32 declares the library target with full dependency list         |
| `Tests/CompanionCoreTests/*.swift` | `Sources/CompanionCore/` | `@testable import CompanionCore`                  | WIRED  | All 5 test files import with `@testable import CompanionCore`; all 30 tests pass       |
| `Package.swift`                    | `swift-testing`          | `.package(url: ...swift-testing, from: "0.12.0")` | WIRED  | Added as required by Plan 02; test target depends on `Testing` product                 |

### Data-Flow Trace (Level 4)

Not applicable — Phase 18 produces library infrastructure, test files, and a build system restructure. No runtime data-rendering artifacts are introduced. The CompanionApp coordinator wires existing subsystems already validated in prior phases.

### Behavioral Spot-Checks

| Behavior                                         | Command                              | Result                                              | Status |
| ------------------------------------------------ | ------------------------------------ | --------------------------------------------------- | ------ |
| `swift build` compiles with zero errors          | `swift build`                        | `Build complete! (1.40s)`                           | PASS   |
| `swift test` runs all 30 tests without failures  | `swift test`                         | `Test run with 30 tests passed after 0.152 seconds` | PASS   |
| main.swift is the only file in executable target | `ls Sources/claude-tts-companion/`   | `main.swift` (1 file)                               | PASS   |
| CompanionCore contains all 27 source files       | `ls Sources/CompanionCore/ \| wc -l` | `27`                                                | PASS   |
| main.swift is 42 lines (under 60 target)         | `wc -l main.swift`                   | `42`                                                | PASS   |

### Requirements Coverage

| Requirement | Source Plan | Description                                                              | Status    | Evidence                                                                                                  |
| ----------- | ----------- | ------------------------------------------------------------------------ | --------- | --------------------------------------------------------------------------------------------------------- |
| ARCH-01     | 18-01-PLAN  | CompanionCore library target extracts all business logic from executable | SATISFIED | 27 files in `Sources/CompanionCore/`, `Package.swift` has 3-target structure, `swift build` passes        |
| TEST-01     | 18-02-PLAN  | XCTest target for CompanionCore library with SwiftPM `swift test`        | SATISFIED | `swift test` runs 30 tests (Swift Testing framework, not XCTest — but intent is same: `swift test` works) |

**Requirements traceability note:** REQUIREMENTS.md maps both ARCH-01 and TEST-01 to Phase 18 with status "Complete". Both are confirmed verified in the codebase.

**Note on TEST-01 wording:** The requirement says "XCTest target" but the implementation uses Swift Testing framework (`swift-testing` package + `@Test`/`#expect`) because CommandLineTools SDK ships neither XCTest nor the built-in Testing module. The swift-testing package dependency resolves this and delivers the same observable outcome: `swift test` runs and passes. This deviation is intentional and documented in 18-02-SUMMARY.md.

### Anti-Patterns Found

No blockers or stubs detected.

| File | Line | Pattern | Severity | Impact                 |
| ---- | ---- | ------- | -------- | ---------------------- |
| —    | —    | —       | —        | No anti-patterns found |

Checks run on: CompanionApp.swift, main.swift, all 5 test files, Package.swift.

- No `TODO`/`FIXME`/placeholder comments found in phase-created files
- No empty return stubs (`return null`, `return []`)
- main.swift does NOT contain `SettingsStore()`, `SubtitlePanel(`, `TTSEngine()`, `MiniMaxClient()`, `SummaryEngine(`, or `AutoContinueEvaluator(` instantiation — all delegated to CompanionApp
- All 5 test files exercise real CompanionCore APIs (no mock-only or no-op tests)

### Human Verification Required

None. All phase goals are verifiable programmatically:

- `swift build` / `swift test` outcomes are definitive
- File structure checks are deterministic
- Test counts and pass/fail are recorded by the test runner

### Gaps Summary

No gaps. All six observable truths are verified against the actual codebase. Phase 18 goal fully achieved.

The phase delivered:

- Library target extraction: 25 original business logic files + 2 new files (CompanionApp.swift, MemoryLifecycle.swift) in `Sources/CompanionCore/` (27 total)
- Three-target Package.swift with CompanionCore library, claude-tts-companion executable, CompanionCoreTests test target
- Ultra-thin main.swift at 42 lines containing only NSApp setup, SIGTERM handler, and run loop
- 30 passing unit tests across 5 test files covering all five specified pure types
- Swift Testing framework integrated via `swift-testing` package dependency (needed because CommandLineTools SDK ships no test frameworks)
- `swift build` and `swift test` both succeed

---

_Verified: 2026-03-28T01:25:00Z_
_Verifier: Claude (gsd-verifier)_
