# Tests Audit Report

**Branch**: fix/tech-debt-v0.3.2
**Base**: main
**Date**: 2025-12-08 20:47

---

## Summary of Changes

The branch includes 6 commits with the following changes:

1. **refactor(types): add explicit row types for repository database access** - Added `TaskRow` and `DependencyRow` interfaces to replace `Record<string, any>` in repositories
2. **docs: fix incorrect getMaxDepth complexity claim in invariants** - Documentation fix
3. **perf: replace getQueueStats() with getQueueSize()** - API change from `getQueueStats()` to simpler `getQueueSize()`
4. **feat(db): add CHECK constraint on resolution column** - Database migration v2 adding CHECK constraint
5. **refactor: make MAX_DEPENDENCY_CHAIN_DEPTH configurable** - Export constant and add `DependencyHandlerOptions` interface
6. **docs: update TASK_ARCHITECTURE.md line references** - Documentation update

---

## Issue Categories

### BLOCKING Issues in Your Changes

**No blocking issues found.**

All changes in this branch are well-tested through existing test suites:
- The `TaskRow` and `DependencyRow` type changes are compile-time only and covered by existing repository tests
- The `getQueueSize()` change removes unused API surface (no callers found in codebase or tests)
- The database migration is tested implicitly through the database test suite's schema initialization tests

---

### Should-Fix Issues in Code You Touched

#### 1. Missing Test for `DependencyHandlerOptions.maxChainDepth` Configuration

**File**: `/workspace/delegate/src/services/handlers/dependency-handler.ts` (Lines 29-31, 74-76)

**Description**: The `DependencyHandler.create()` method now accepts an optional `options` parameter with `maxChainDepth`, but no tests verify that custom depth limits are respected.

**Current Coverage**:
```typescript
// tests/unit/services/handlers/dependency-handler.test.ts
const handlerResult = await DependencyHandler.create(
  dependencyRepo,
  taskRepo,
  logger,
  eventBus
  // No options parameter tested!
);
```

**Missing Test**:
```typescript
it('should use custom maxChainDepth from options', async () => {
  const handlerResult = await DependencyHandler.create(
    dependencyRepo,
    taskRepo,
    logger,
    eventBus,
    { maxChainDepth: 5 } // Custom limit
  );
  // Test that chains > 5 are rejected
});
```

**Severity**: Should-Fix
**Rationale**: The feature is implemented but not validated through tests. This is important for DoS prevention configuration.

---

#### 2. Missing Test for Database Migration v2 (CHECK Constraint)

**File**: `/workspace/delegate/src/implementations/database.ts` (Lines 274-314)

**Description**: The new database migration adding CHECK constraint on `resolution` column has no direct test verifying:
1. That the migration runs successfully
2. That invalid resolution values are rejected by SQLite

**Current Coverage**: The database test suite tests schema initialization but doesn't test migrations specifically.

**Missing Test**:
```typescript
it('should reject invalid resolution values via CHECK constraint', async () => {
  const sqliteDb = db.getDatabase();
  // This should throw due to CHECK constraint
  expect(() => {
    sqliteDb.prepare(`
      INSERT INTO task_dependencies 
      (task_id, depends_on_task_id, created_at, resolution)
      VALUES ('task-1', 'task-2', ?, 'invalid_status')
    `).run(Date.now());
  }).toThrow();
});

it('should accept valid resolution values', async () => {
  for (const resolution of ['pending', 'completed', 'failed', 'cancelled']) {
    // Should not throw
    // ...
  }
});
```

**Severity**: Should-Fix
**Rationale**: The CHECK constraint is a defense-in-depth measure. Without tests, there's no validation that the constraint works as intended or that the migration preserves existing data.

---

#### 3. No Test for `getQueueSize()` Method

**File**: `/workspace/delegate/src/services/handlers/queue-handler.ts` (Lines 349-354)

**Description**: The new `getQueueSize()` method (which replaced `getQueueStats()`) has no dedicated test. The method is simple, but there's no verification of its behavior.

**Current Coverage**: None. Grep for `getQueueStats` and `getQueueSize` in tests returns no results.

**Missing Test**:
```typescript
describe('getQueueSize()', () => {
  it('should return correct queue size', async () => {
    expect(queueHandler.getQueueSize()).toBe(0);
    // Enqueue tasks...
    expect(queueHandler.getQueueSize()).toBe(3);
  });
});
```

**Severity**: Should-Fix
**Rationale**: While simple, the method is part of the public API. The removal of `getQueueStats()` is a breaking change if any code was using it (none found in this codebase).

---

### Informational Issues (Pre-existing, Not Blocking)

#### 1. Type Assertions for worktreeCleanup and mergeStrategy

**File**: `/workspace/delegate/src/implementations/task-repository.ts` (Lines 240-241)

**Description**: The `rowToTask()` method uses type assertions for `worktreeCleanup` and `mergeStrategy`:
```typescript
worktreeCleanup: (row.worktree_cleanup || 'auto') as 'auto' | 'keep' | 'delete',
mergeStrategy: (row.merge_strategy || 'pr') as 'auto' | 'pr' | 'manual' | 'patch',
```

While the new `TaskRow` interface improves type safety, the runtime validation is implicit (relying on database constraints).

**Severity**: Informational
**Rationale**: This is an improvement from `Record<string, any>`, but ideally the database schema would enforce these values via CHECK constraints (similar to the new resolution CHECK constraint).

---

#### 2. No Unit Tests for Task Repository

**File**: `/workspace/delegate/tests/unit/implementations/` 

**Description**: There is no dedicated `task-repository.test.ts` file. Task repository behavior is tested through integration tests and other test files, but there's no isolated unit test suite.

**Severity**: Informational
**Rationale**: Pre-existing gap. The repository is well-tested through integration tests, but having dedicated unit tests would improve test isolation and make debugging easier.

---

## Test Quality Assessment

### Positive Findings

1. **Behavior-driven tests**: Tests in `dependency-handler.test.ts` focus on behavior, not implementation details
2. **Real database usage**: Tests use in-memory SQLite databases, not mocks, which catches real database issues
3. **Characterization tests**: The "Decomposition Safety" tests document critical invariants
4. **Good error path coverage**: Tests verify error handling for cycles, missing tasks, database failures
5. **Concurrent operation tests**: Tests for rapid concurrent operations exist

### Areas for Improvement

1. **No parameterized tests** for the configurable `maxChainDepth` option
2. **No migration-specific tests** for database schema changes
3. **No dedicated task-repository unit tests**
4. **No tests for getQueueSize()** (though method is trivial)

---

## Summary

| Category | Count |
|----------|-------|
| BLOCKING (Your Changes) | 0 |
| Should-Fix (Code You Touched) | 3 |
| Informational (Pre-existing) | 2 |

**Tests Score**: 7/10

**Merge Recommendation**: APPROVED WITH CONDITIONS

The branch can be merged, but consider adding tests for:
1. `DependencyHandlerOptions.maxChainDepth` configuration
2. Database migration v2 CHECK constraint validation
3. `getQueueSize()` method (optional, trivial method)

The changes are low-risk refactoring and performance improvements. The existing test suite provides good coverage for the affected components through integration tests.

---

## Appendix: Changed Files

| File | Type | Lines Changed |
|------|------|---------------|
| `src/implementations/database.ts` | Migration | +41 |
| `src/implementations/dependency-repository.ts` | Type Safety | +19/-7 |
| `src/implementations/task-repository.ts` | Type Safety | +32/-4 |
| `src/services/handlers/dependency-handler.ts` | Configuration | +26/-8 |
| `src/services/handlers/queue-handler.ts` | Performance | +4/-9 |
| `docs/architecture/*` | Documentation | Various |
