# Phase 12: Test Reset & Coverage — Summary

**Status:** COMPLETE
**Date:** 2026-03-14
**Duration:** ~2 hours

---

## What Was Accomplished

### 1. New Test File Created
- **`tests/test_llm_structured.py`** — 35 tests
  - `TestTruncationResult` (4 tests) — dataclass field validation
  - `TestDetectTruncationCompleteResponse` (4 tests) — complete JSON handling
  - `TestDetectTruncationEmptyInput` (2 tests) — empty/whitespace inputs
  - `TestDetectTruncationTruncatedResponse` (3 tests) — truncated JSON recovery
  - `TestDetectTruncationInvalidInput` (4 tests) — no JSON, invalid structure
  - `TestExtractJson` (8 tests) — JSON extraction from various formats
  - `TestCreateStructuredChain` (6 tests) — tool-calling vs prompt-based chains
  - `TestJsonOutputParser` (4 tests) — internal parser for non-tool-calling models

### 2. Tests Added to Existing Files
- **`tests/test_llm_provider.py`** — +14 tests
  - `TestGetRetryDelay` (8 tests) — provider-specific retry delay values
  - `TestGetEffectiveTokenBudget` (6 tests) — provider token budget capping

- **`tests/test_mission_generator.py`** — +6 tests
  - `TestGenerateCategoryMissionsMulti` (6 tests) — multi-call truncation resume

### 3. Test Quality Metrics
- **Field Coverage:** All tests assert ALL fields on returned objects
- **Exact Counts:** All count assertions use `==`, never `>=` or `> 0`
- **Negative Test Ratio:** All test classes meet or exceed 1:2 minimum
- **No Mirror Tests:** Tests verify behavior, not implementation details
- **No Tautologies:** Tests assert computed values, not setup data

---

## Test Count Summary

| Metric | Count |
|--------|-------|
| Tests before Phase 12 | 725 |
| Tests after Phase 12 | 780 |
| **New tests added** | **55** |

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## Files Modified

| File | Change |
|------|--------|
| `tests/test_llm_structured.py` | **NEW** — 35 tests |
| `tests/test_llm_provider.py` | +14 tests |
| `tests/test_mission_generator.py` | +6 tests |

---

## Issues Discovered

### Contract vs Implementation Discrepancies

1. **Auth Error Wrapping**
   - Contract: AuthenticationError raised immediately
   - Implementation: AuthenticationError wrapped in MissionGenerationError
   - Documented in test with comment

2. **Truncation Detection Path**
   - Contract implied: Truncated JSON returns `is_truncated=True`
   - Implementation: `_extract_json()` repairs truncated JSON before detection
   - Documented in tests with comments

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## Security Checklist

- [x] No API keys in test files
- [x] No real LLM calls (all mocked)
- [x] No file system mutations in tests
- [x] No network access in tests

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## Commands to Verify

```bash
# Run all tests
pytest --tb=short -q

# Run Phase 12 specific tests
pytest tests/test_llm_structured.py -v
pytest tests/test_llm_provider.py::TestGetRetryDelay -v
pytest tests/test_llm_provider.py::TestGetEffectiveTokenBudget -v
pytest tests/test_mission_generator.py::TestGenerateCategoryMissionsMulti -v
```

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## Next Phase

Phase 13: TUI Application (textual-based terminal UI)

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## Lessons Learned

1. **LangChain Mocking Challenges**
   - MagicMock with `|` operator breaks because LangChain uses operator overloading
   - Solution: Patch the prompt's `__or__` method instead of the model

2. **Internal Function Testing**
   - Testing `_extract_json` directly was necessary to verify all edge cases
   - Internal functions can be imported and tested when needed for coverage

3. **Multi-Call Mocking**
   - Use `side_effect` with a list to return different values on successive calls
   - Essential for testing truncation resume behavior
