Create comprehensive test plans for dotNET-mail-demo repository

[Copilot]

Overview

This PR adds comprehensive test planning documentation for all components of the Tailwind Traders Mail Service. The test plans provide detailed specifications for unit, integration, and end-to-end testing across the entire system.

What's Included

Master Test Plan

A comprehensive TEST_PLAN.md that defines:

• Overall testing strategy and methodology
• Test environment setup and prerequisites
• Key user stories with acceptance criteria
• Quality gates and entry/exit criteria
• Risk assessment and mitigation strategies
• Test metrics and performance benchmarks
• Testing schedule and execution plan

Component Test Plans

Five detailed test plans covering all system components:

1. Server API Test Plan (568 lines)

   • .NET 8.0 Minimal API testing
   • Unit tests for models, services, and data layer
   • Integration tests for all API endpoints (public and admin)
   • End-to-end workflows for user stories
   • Performance tests (10K contact broadcasts)
   • Security tests (SQL injection, XSS, authentication)

2. CLI Test Plan (710 lines)

   • Node.js CLI command testing
   • Markdown parsing and validation tests
   • API client integration tests
   • Interactive prompt testing
   • AI-powered broadcast generation tests

3. Jobs Service Test Plan (812 lines)

   • Go service testing with Mage automation
   • Email sender tests (SMTP, Azure Communication Services)
   • Queue management tests (Service Bus, test queuer)
   • Container image testing
   • Performance and resource usage tests

4. Database Test Plan (802 lines)

   • PostgreSQL schema validation
   • Data integrity and constraint testing
   • CRUD operation tests
   • Query performance benchmarks
   • Transaction and concurrency tests
   • Backup and recovery validation

5. Integration Test Plan (898 lines)

   • Complete end-to-end workflow scenarios
   • Cross-component integration tests
   • System health checks
   • Load and performance testing
   • Error recovery testing

Developer Resources

• Quick Test Guide - Developer quick reference with copy-paste commands for running tests, common scenarios, and troubleshooting tips
• Documentation Hub - Updated central documentation index with architecture diagrams and links to all test plans

Test Coverage Goals

Component	Coverage Target	Critical Paths
Server API	70%+	80%+
CLI	60%+	70%+
Jobs Service	65%+	75%+
Database	Schema validation	Query performance
Integration	All user stories validated	-

User Stories Validated

All test plans align with documented user stories:

✅ Jill queues a broadcast to 10K contacts - Test broadcasting to 10,001 contacts with one opted out, verifying exactly 10,000 messages are queued within 30 seconds

✅ Jim wants to signup to Jill's list - Test complete double opt-in flow from subscription request through confirmation email to active subscription

✅ Kim gets too much email - Test unsubscribe functionality via email link, verifying contact is excluded from future broadcasts

Key Features

Each test plan includes:

• Detailed test case specifications with expected results
• Test data and fixtures for reproducible testing
• Manual testing checklists for comprehensive validation
• CI/CD integration examples (GitHub Actions)
• Performance benchmarks with specific metrics
• Security test cases for common vulnerabilities
• Troubleshooting guidance and debugging tips

Documentation Statistics

• 8 files created
• 4,602 lines of comprehensive test documentation
• 124KB total documentation size
• Covers unit, integration, E2E, performance, and security testing

Benefits

1. Actionable - All test plans provide specific, implementable test cases
2. Comprehensive - Covers all components and integration points
3. Standards-based - Follows industry best practices for test planning
4. Developer-friendly - Quick reference guide and clear examples
5. CI/CD Ready - Includes automation examples for continuous testing

Next Steps

These test plans are ready for implementation by the development team. They can be used to:

• Guide test-driven development (TDD)
• Create automated test suites
• Establish quality gates in CI/CD pipelines
• Validate releases before deployment
• Onboard new team members to testing practices

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All test plans have been reviewed and validated for consistency, accuracy, and completeness.

Original prompt

Create test plans for this repo
Create test plans for this repo

Created from VS Code via the [GitHub Pull Request](https://marketplace.visualstudio.com/items?itemName=GitHub.vscode-pull-request-github) extension.

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[scubaninja]

@copilot ensure you use xunit

[Copilot]

@copilot ensure you use xunit

The test plans already specify xUnit as the testing framework for the .NET Server API:

• SERVER_TEST_PLAN.md lists xUnit in the Technology Stack section (line 12)
• All test examples use xUnit syntax with [Fact] attributes
• Test examples show proper xUnit assertions like Assert.Equal
• Integration test examples use IClassFixture<WebApplicationFactory<Program>> pattern
• The master TEST_PLAN.md lists ".NET: xUnit, Microsoft.AspNetCore.Mvc.Testing" in the Tools and Frameworks section

The project's csproj file already includes xUnit packages, so the test plans are aligned with the existing setup.