Book Image

Get Your Hands Dirty on Clean Architecture

By : Tom Hombergs
Book Image

Get Your Hands Dirty on Clean Architecture

By: Tom Hombergs

Overview of this book

Building for maintainability is key to keeping development costs low and processes easy. The second edition of Get Your Hands Dirty on Clean Architecture is here to equip you with the essential skills and knowledge to build maintainable software. With this comprehensive guide, you’ll explore the drawbacks of conventional layered architecture and the advantages of domain-centric styles such as Robert C. Martin's Clean Architecture and Alistair Cockburn's Hexagonal Architecture. Then, you’ll dive into hands-on explanations on how to convert hexagonal architecture into actual code. You'll learn in detail about different mapping strategies between the layers of hexagonal architecture and discover how to assemble the architectural elements into an application. Additionally, you’ll understand how to enforce architecture boundaries, which shortcuts produce what types of technical debt, and how, sometimes, it is a good idea to willingly take on those debts. By the end of this second edition, you'll be armed with a deep understanding of the hexagonal architecture style and be ready to create maintainable web applications that save money and time.
Table of Contents (13 chapters)

Testing a Persistence Adapter with Integration Tests

For a similar reason, it makes sense to cover persistence adapters with integration tests instead of unit tests, since we not only want to verify the logic within the adapter, but also the mapping into the database.

We want to test the persistence adapter we built in Chapter 6, Implementing a Persistence Adapter. The adapter has two methods, one for loading an Account entity from the database and another to save new account activities to the database:


@Import({AccountPersistenceAdapter.class, AccountMapper.class})

class AccountPersistenceAdapterTest {


  private AccountPersistenceAdapter adapterUnderTest;



  private ActivityRepository activityRepository;



  void loadsAccount() {

    Account account = adapter.loadAccount(