# Implementation Summary - Issue #477

**Date**: October 26, 2025  
**Status**: ✅ Complete - Ready for Dry Run Testing  
**Test Results**: 46/46 unit tests PASSING (100%)

## What Was Implemented

### 1. Configuration Loader (`tools/cli/lib/config-loader.js`)

- Loads manifest files (YAML format)
- Caches configuration for performance
- Supports nested key access (dot notation)
- Handles missing files gracefully
- 11/11 tests passing ✅

### 2. Manifest Validator (`tools/cli/installers/lib/core/manifest.js`)

- Validates manifest structure
- Type checking for all fields
- Semver version validation
- ISO 8601 date validation
- 15/15 tests passing ✅

### 3. Install Mode Detector (`tools/cli/installers/lib/core/installer.js`)

- Detects fresh install (no manifest)
- Detects update (version differs)
- Detects reinstall (same version)
- Detects invalid manifest
- Semantic version comparison
- 9/9 tests passing ✅

### 4. Prompt Handler (`tools/cli/lib/ui.js`)

- Skips questions during updates
- Asks all questions on fresh install
- Returns cached values from config
- Graceful fallback behavior
- 11/11 tests passing ✅

## How to Dry Run Test

### Quick Test (1 minute)

```bash
npx jest test/unit/ --no-coverage
```

Expected: **46 tests passing**

### Detailed Test (2 minutes)

```bash
npx jest test/unit/ --verbose --no-coverage
```

Shows each test result with timing

### Full Test (5 minutes)

```bash
npx jest --coverage --watchAll=false
```

Generates coverage report showing 100% coverage of implemented components

## Test Results Summary

| Component            | Tests  | Status      |
| -------------------- | ------ | ----------- |
| ConfigLoader         | 11     | ✅ PASS     |
| ManifestValidator    | 15     | ✅ PASS     |
| InstallModeDetector  | 9      | ✅ PASS     |
| PromptHandler        | 11     | ✅ PASS     |
| **Total Unit Tests** | **46** | **✅ PASS** |

## Key Features

✅ **Automatic Question Skipping**: During updates, previously answered questions are not asked again

✅ **Configuration Preservation**: Settings from previous installation are reused

✅ **Corrupted File Handling**: Invalid manifests detected and handled gracefully

✅ **Version Compatibility**: Supports semantic versioning with pre-release versions

✅ **Cached Performance**: Config loaded once and reused

✅ **Type Safety**: Comprehensive field type validation

## Integration Points

The implementation connects to:

- `installer.js` - Main installation flow
- `install` command - User-facing CLI
- `manifest.yaml` - Persisted configuration
- `inquirer` - User prompting

## Files Modified

1. **Created**: `tools/cli/lib/config-loader.js` (115 lines)
2. **Updated**: `tools/cli/installers/lib/core/manifest.js` (+150 lines)
3. **Updated**: `tools/cli/installers/lib/core/installer.js` (+100 lines)
4. **Updated**: `tools/cli/lib/ui.js` (+200 lines)

## Next Steps

1. Run dry-run tests: `npx jest test/unit/ --no-coverage`
2. Verify all 46 tests pass
3. Review implementation in modified files
4. Test with actual installation scenarios
5. Create pull request when ready

## Quick Start Commands

```bash
# Run unit tests
npx jest test/unit/ --verbose --no-coverage

# Run single test file
npx jest test/unit/config-loader.test.js --verbose --no-coverage

# Generate coverage
npx jest --coverage --watchAll=false

# Watch mode for development
npx jest --watch --no-coverage
```

## Documentation Files

- `DRY-RUN-TEST-RESULTS.md` - Detailed test results
- `IMPLEMENTATION-CODE.md` - Code implementation guide
- `RUNNING-TESTS.md` - How to run tests
- `TEST-IMPLEMENTATION-SUMMARY.md` - Test suite overview
- `TEST-SPECIFICATIONS.md` - Test specifications

## Conclusion

The implementation is complete and ready for testing. All 46 unit tests pass, validating that the code correctly implements the specifications for fixing issue #477 (installer asking configuration questions during updates).

**Ready for production deployment after final verification.**