# Complexity Audit Report

**Branch**: fix/timing-based-test-waits
**Base**: main
**Date**: 2025-12-28 22:51:00

---

## Summary

This PR replaces timing-based test waits (`setTimeout`) with deterministic event-driven synchronization patterns. The changes reduce test flakiness and improve test reliability by eliminating arbitrary delays.

**Files Changed**: 12
- 1 source file (bootstrap.ts)
- 2 test utility files (test-doubles.ts, event-helpers.ts)
- 9 test files (integration and unit tests)

---

## RED: Issues in Your Changes (BLOCKING)

**None identified.**

The changes are sound refactoring that improves code quality:
- Replaces arbitrary `setTimeout(resolve, 100)` calls with `flushEventLoop()`
- Adds proper event synchronization utilities (`waitFor`, `waitForEvent`, etc.)
- Enables dependency injection for ResourceMonitor in tests

---

## YELLOW: Issues in Code You Touched (Should Fix)

### 1. Handler Cleanup in waitFor() - MEDIUM

**File**: `/workspace/delegate/tests/fixtures/test-doubles.ts`
**Lines**: 219-232

The `waitFor()` method subscribes a handler but does not unsubscribe on the success path. While the test harness calls `dispose()` between tests, explicit cleanup would be cleaner.

```typescript
// Current (line 224-231):
const handler = async (event: any) => {
  if (filter(event)) {
    clearTimeout(timer);
    resolve(event);
  }
};
this.subscribe(eventType, handler);

// Suggested improvement:
let unsubscribe: (() => void) | null = null;
const handler = async (event: any) => {
  if (filter(event)) {
    clearTimeout(timer);
    if (unsubscribe) unsubscribe();
    resolve(event);
  }
};
unsubscribe = this.subscribe(eventType, handler);
```

**Impact**: Low - dispose() handles cleanup between tests
**Recommendation**: Fix in follow-up PR

### 2. once() Handler Remains Subscribed - LOW

**File**: `/workspace/delegate/tests/fixtures/test-doubles.ts`
**Lines**: 250-258

The `once()` method uses a flag to prevent re-execution but leaves the wrapped handler subscribed. This is acceptable given dispose() cleanup but could be improved.

```typescript
// Current pattern uses `called` flag
// Could be improved to unsubscribe after first call
```

**Impact**: Low - dispose() handles cleanup
**Recommendation**: Consider improvement in follow-up

### 3. Inefficient collectEvents() Pattern - LOW

**File**: `/workspace/delegate/tests/utils/event-helpers.ts`
**Lines**: 72-75

The `collectEvents()` function calls `once()` in a loop, which is less efficient than a single subscription with a counter.

```typescript
// Current:
for (let i = 0; i < count; i++) {
  eventBus.once(eventType, handler);
}

// More efficient:
eventBus.on(eventType, handler);
// Then cleanup after count reached
```

**Impact**: Low - test performance only
**Recommendation**: Optional optimization

---

## INFO: Pre-existing Issues (Not Blocking)

**None identified in touched code.**

The refactoring improves upon the previous pattern of arbitrary setTimeout delays which were:
- Non-deterministic (could be too short or too long)
- Wasteful (usually waited longer than necessary)
- Flaky (timing-dependent test failures)

---

## Metrics

### Cyclomatic Complexity
| File | Before | After | Change |
|------|--------|-------|--------|
| test-doubles.ts | Low | Low | +76 lines (new methods) |
| event-helpers.ts | N/A | Low | New file (126 lines) |
| Integration tests | Low | Low | Simplified timing |

### Readability
- **Improved**: setTimeout calls replaced with semantic `flushEventLoop()` and `waitFor()`
- **Good documentation**: JSDoc comments on new utility methods
- **Clear intent**: Method names describe what they wait for

### Maintainability
- **Improved**: Deterministic event-based synchronization
- **Better testability**: Event helpers are reusable across test files
- **Consistent patterns**: All tests use same synchronization approach

---

## Summary

**Your Changes:**
- RED: 0 CRITICAL, 0 HIGH, 0 MEDIUM

**Code You Touched:**
- YELLOW: 0 HIGH, 3 MEDIUM/LOW (all minor improvements)

**Pre-existing:**
- INFO: 0

**Complexity Score**: 8/10

The PR reduces overall complexity by replacing non-deterministic timing with event-driven synchronization. The new test utilities are well-documented and follow consistent patterns.

**Merge Recommendation**: APPROVED

The changes improve test reliability without introducing complexity issues. The minor improvements identified are optional and can be addressed in follow-up PRs.

---

## PR Comments

No blocking issues to comment on. The identified improvements are informational and do not warrant PR line comments that would block merge.

- Comments Created: 0
- Comments Skipped: 0 (no blocking issues)
