Testing Strategy

Generate and maintain tests following project-specific conventions for this .NET/EF Core DDD codebase.

Quick Reference

Test Pyramid

        +-------------+
        |  App Layer  |  Primary: Integration tests with SQLite in-memory
        |  Handlers   |  IAsyncLifetime pattern for isolation
        +-------------+
        |  Domain     |  Secondary: Unit tests for complex logic only
        |  Logic      |  Skip simple getters/setters
        +-------------+

Key Decisions

• •NO E2E tests - Application layer integration tests provide sufficient coverage
• •SQLite in-memory - Not EF Core InMemory provider (real constraints matter)
• •IAsyncLifetime - Each test method gets fresh DB instance
• •Builder pattern - Fluent builders with sensible defaults
• •Japanese test names - Describe behavior clearly

Test Implementation Guide

Step 1: Determine Test Type

Step 2: Create Test Class

See references/patterns.md for complete templates:

• •Application Layer: IAsyncLifetime pattern with SQLite
• •Domain Layer: Simple unit test class

Step 3: Use Builders for Test Data

See references/builders.md for all available builders.

Key rules:

• •Single entity: use defaults
• •Multiple entities: MUST specify unique IDs

Step 4: Write Test Methods

See references/examples.md for common scenarios:

• •CommandHandler tests
• •QueryHandler with related data
• •Domain state transitions
• •Exception testing

Resources

Anti-Patterns Summary