Skip to content

AI_SESSIONS.md

Latest commit

 

History

History
176 lines (144 loc) · 6.75 KB

AI_SESSIONS.md

File metadata and controls

176 lines (144 loc) · 6.75 KB

AI-Assisted Development Sessions

This document tracks development sessions where AI (Claude Code) was used to assist with implementation.

Session 1: Comprehensive Unit Testing & Architecture Refactoring

Date: 2025-11-23 AI Model: Claude Sonnet 4.5 Developer: Jay Van der Zant

Objectives

  • Implement comprehensive unit testing for the MIM Synchronisation Scheduler
  • Enable testability through dependency injection architecture
  • Add CI/CD with GitHub Actions

Session Overview

Phase 1: Project Modernisation

Tasks Completed:

  • Converted project from old .csproj format to SDK-style while maintaining .NET Framework 4.8.1
  • Restructured solution to follow .NET best practices (src/ and tests/ directories)
  • Updated NuGet packages (Serilog 2.10.0 → 2.12.x with wildcard versioning)
  • Fixed build issues with deterministic builds and assembly info generation

Key Decisions:

  • Kept .NET Framework 4.8.1 (not .NET Core/8) due to System.Management.Automation dependencies
  • Used SDK-style project format for better tooling support
  • Added <Deterministic>false</Deterministic> to support wildcard assembly versioning

Phase 2: Architecture Refactoring for Testability

Tasks Completed:

  • Extracted service layer with dependency injection interfaces and implementations:
    • IProcessExecutor / ProcessExecutor - PowerShell, VBS, executable execution
    • ISqlExecutor / SqlExecutor - SQL Server command execution
    • IManagementAgentExecutor / ManagementAgentExecutor - MIM WMI operations
    • ITaskExecutor / TaskExecutor - Task orchestration logic
    • IScheduleExecutor / ScheduleExecutor - Schedule execution coordination
  • Refactored Program.cs from ~800 lines of static methods to ~100 line coordinator
  • Implemented proper constructor injection with null validation

Key Decisions:

  • All external dependencies abstracted behind interfaces for mockability
  • WhatIf mode propagated through all services via constructor parameter
  • Used tuple returns (bool success, bool importsChanged) to handle parallel execution with ref parameters

Challenges Solved:

  • Ref parameters in lambda expressions: Cannot capture ref parameters in Task.Run lambdas. Solved using tuple returns and aggregation after Task.WaitAll()
  • Parallel state management: Block tasks execute in parallel but need to aggregate import changes. Used List<Task<(bool, bool)>> pattern

Phase 3: Comprehensive Testing

Tasks Completed:

  • Created xUnit test project with 37 tests (100% passing)
  • Integration tests for ProcessExecutor (11 tests with real PowerShell, VBS, CMD execution)
  • Unit tests for TaskExecutor (13 tests with Moq mocks)
  • Unit tests for ScheduleExecutor (3 tests)
  • Model tests for Schedule and ScheduleTask (10 tests)
  • Utility tests for Timer and stack trace helpers

Test Infrastructure:

  • Helper scripts: test-success.ps1, test-failure.ps1, test-success.vbs, test-failure.vbs
  • Test schedule configuration files
  • Comprehensive README documenting all 37 tests and testing strategy

Key Decisions:

  • Integration tests for ProcessExecutor (test against real external processes)
  • Unit tests with mocks for business logic (no external dependencies)
  • Stack trace tests validate behaviour (non-empty strings) rather than exact values (CI-friendly)

Challenges Solved:

  • VS Code test discovery: C# Dev Kit has issues with .NET Framework 4.8.1 tests. Documented workaround (reload window, use CLI)
  • Test output verbosity: Added --logger "console;verbosity=detailed" to tasks.json
  • CI test failures: Stack trace introspection returns different values in test runners. Fixed by testing for patterns instead of exact matches

Phase 4: CI/CD Implementation

Tasks Completed:

  • Created GitHub Actions workflow (.github/workflows/build-and-test.yml)
  • Automated build and test on push to master and feature branches
  • Added test result publishing with dorny/test-reporter

Key Decisions:

  • Used windows-latest runner (required for .NET Framework 4.8.1)
  • .NET 8.0 SDK can build .NET Framework 4.8.1 projects
  • TRX logger format for test result reporting

Phase 5: Code Review

Tasks Completed:

  • Comprehensive code review of entire solution
  • Identified critical issue: duplicate implementation in Program.cs
  • Documented medium and low priority issues
  • Created CODE_REVIEW.md with findings

Metrics

  • Lines Added: 1,991 across 45 files
  • Tests: 37 (up from 14)
  • Test Pass Rate: 100%
  • Service Interfaces: 5
  • Dead Code Identified: ~550 lines in Program.cs

Files Created

.github/workflows/build-and-test.yml
.vscode/tasks.json
src/Tetron.Mim.SynchronisationScheduler/Interfaces/*.cs (5 files)
src/Tetron.Mim.SynchronisationScheduler/Services/*.cs (5 files)
tests/Tetron.Mim.SynchronisationScheduler.Tests/Services/*.cs (3 files)
tests/Tetron.Mim.SynchronisationScheduler.Tests/Models/*.cs (2 files)
tests/Tetron.Mim.SynchronisationScheduler.Tests/TestHelpers/* (5 files)
tests/Tetron.Mim.SynchronisationScheduler.Tests/README.md
docs/AI_SESSIONS.md (this file)
docs/CODE_REVIEW.md
docs/DEVELOPMENT.md

Pull Requests

  • PR #10: "Add comprehensive unit testing with dependency injection architecture"
    • Branch: feature/add-unit-tests
    • Status: Merged to master
    • Commits: 11
    • All CI checks passing after fix for stack trace tests

Next Steps

Based on code review findings:

  1. Remove duplicate implementation from Program.cs (lines 271-826)
  2. Add null validation in ScheduleExecutor constructor
  3. Add null check for schedule.Name attribute parsing
  4. Fix block task validation to check all tasks (not just first)
  5. Add tests for retry scenarios

AI-Generated Code Percentage

  • 100% AI-assisted: Service interfaces, service implementations, test classes, GitHub Actions workflow
  • Human modifications: Stack trace test assertions (adjusted for CI compatibility)
  • Collaboration: Architectural decisions, testing strategy, and refactoring approach discussed and approved by developer

Lessons Learned

  • SDK-style projects work well with .NET Framework 4.8.1
  • Dependency injection dramatically improves testability
  • Integration tests + unit tests provide comprehensive coverage
  • Stack trace introspection is brittle in test environments
  • Always remove old code after refactoring (identified in code review)

Session Template for Future Work

## Session N: [Title]
**Date:** YYYY-MM-DD
**AI Model:** Claude Sonnet X.X
**Developer:** [Name]

### Objectives
- [Objective 1]
- [Objective 2]

### Tasks Completed
- [Task 1]
- [Task 2]

### Key Decisions
- [Decision 1 with rationale]

### Challenges Solved
- **[Challenge]:** [Solution]

### Metrics
- Lines added/modified:
- Tests added:
- Performance impact:

### Files Modified

[file list]


### Next Steps
- [Next step 1]