Testing Strategy

Testing Pyramid

Tests are organised in a pyramid structure with more unit tests than integration tests:

graph TD
    A[Integration Tests] --> B[Application Unit Tests]
    B --> C[Domain Unit Tests]

    style C fill:#e8f5e9
    style B fill:#fff3e0
    style A fill:#ffebee

Test Characteristics:

Test Type	Speed	Quantity	Dependencies	Purpose
Domain Unit Tests	Fastest	Most	None (pure domain)	Test value objects and entities
Application Unit Tests	Fast	Medium	Mocked repositories	Test handlers and validators
Integration Tests	Slower	Fewest	Real database (Docker)	Test full API → Database flow

BE

Integration Test Setup

• Uses Testcontainers for real MySQL database in Docker
• All tests share a single container for performance (marked with [Collection(nameof(IntegrationTestCollection))])
• Each test gets a clean database automatically
• Inherits from BaseIntegrationTest for common setup