Testing Domain Entities in Hexagonal Architecture

In modern software design, keeping your core business logic clean and independent of external tools is essential for long-term maintainability. Hexagonal Architecture excels at this separation, but testing these isolated domain entities requires a structured and deliberate approach. This text-only course guides you through the principles and practices of unit testing domain entities. You will learn how to verify complex business rules in complete isolation, ensuring your core logic remains robust, readable, and decoupled from databases, frameworks, and third-party APIs. What you'll learn: - Understand the role of domain entities and business rules within Hexagonal Architecture - Write clean unit tests using the Arrange-Act-Assert pattern for maximum readability - Test pure domain logic in isolation without mocking external infrastructure - Apply modern assertion patterns to verify state changes and domain events - Design highly testable domain models that naturally resist regressions You will start by exploring foundational architectural concepts and key terminology before moving into practical, step-by-step written guides that show you how to structure, write, and refine your entity tests. This course is designed for software developers and architects who are new to testing domain-driven designs, with no prior testing experience required. Start writing reliable, decoupled unit tests for your domain logic today.