Book Image

Hands-On Swift 5 Microservices Development

Book Image

Hands-On Swift 5 Microservices Development

Overview of this book

The capabilities of the Swift programming language are extended to server-side development using popular frameworks such as Vapor. This enables Swift programmers to implement the microservices approach to design scalable and easy-to-maintain architecture for iOS, macOS, iPadOS, and watchOS applications. This book is a complete guide to building microservices for iOS applications. You’ll start by examining Swift and Vapor as backend technologies and compare them to their alternatives. The book then covers the concept of microservices to help you get started with developing your first microservice. Throughout this book, you’ll work on a case study of writing an e-commerce backend as a microservice application. You’ll understand each microservice as it is broken down into details and written out as code throughout the book. You’ll also become familiar with various aspects of server-side development such as scalability, database options, and information flow for microservices that are unwrapped in the process. As you advance, you’ll get to grips with microservices testing and see how it is different from testing a monolith application. Along the way, you’ll explore tools such as Docker, Postman, and Amazon Web Services. By the end of the book, you’ll be able to build a ready-to-deploy application that can be used as a base for future applications.
Table of Contents (19 chapters)

Functional tests versus unit tests

As with so many things in life, there is no such thing as the "better testing approach." You will need both functional tests and unit tests. Unit tests are validation for functions individually, and functional tests test your application as a whole. That being said, there are pros and cons to both approaches.

Unit test pros and cons

The pros of unit testing are as follows:

  • It can validate a function 100%.
  • It finds errors quite easily.
  • Tests are quickly executed and repeated.

The cons of unit testing are as follows:

  • It cannot easily test database operations.
  • It struggles to dynamically test functions.

It is worth noting that web applications specifically are almost always doing...