Discover Hexagonal Architecture to create web applications with isolated, testable layers. Gain insights into designing clean, maintainable modules and advocating for suitable techniques for your application.

Get Your Hands Dirty on Clean Architecture by Tom Hombergs.png

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This course will teach you all about creating a web application in the Hexagonal Architecture style. Hexagonal Architecture promotes the separation of concerns by encapsulating logic in different layers of the application. This enables a higher level of isolation, testability, and control over your business specific code. 

You will learn how to design software modules and complete applications in a clean and maintainable manner, while also learning how to advocate for a certain technique given your application and constraints.

By the end of this course, you will have a greater understanding of how to implement software architecture, a key skill for any senior developer.

Hexagonal Software Architecture for Web Applications

As we did for the web controller, 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.

## Account persistence adapter test

We want to test the persistence adapter we built in the chapter ["Implementing a Persistence Adapter"](https://www.educative.io/courses/hexagonal-architecture-web-apps/dependency-inversion-with-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:

As we did for the web controller, 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.

# Account persistence adapter test

We want to test the persistence adapter we built in the chapter ["Implementing a Persistence Adapter"](https://www.educative.io/courses/hexagonal-architecture-web-apps/dependency-inversion-with-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:

Learn how to test a persistence adapter with integration testing.

Before We Begin

What's Wrong with Layers?

Inverting Dependencies

Organizing Code

Implementing a Use Case

Implementing a Web Adapter

Implementing a Persistence Adapter

Testing Architecture Elements

Mapping Between Boundaries

Assembling the Application

Enforcing Architecture Boundaries

Taking Shortcuts Consciously

Assessment

Conclusion

Appendix

Testing a Persistence Adapter with Integration Tests

Account persistence adapter test