Book Image

Learn Kotlin Programming - Second Edition

By : Stephen Samuel, Stefan Bocutiu
Book Image

Learn Kotlin Programming - Second Edition

By: Stephen Samuel, Stefan Bocutiu

Overview of this book

Kotlin is a general-purpose programming language used for developing cross-platform applications. Complete with a comprehensive introduction and projects covering the full set of Kotlin programming features, this book will take you through the fundamentals of Kotlin and get you up to speed in no time. Learn Kotlin Programming covers the installation, tools, and how to write basic programs in Kotlin. You'll learn how to implement object-oriented programming in Kotlin and easily reuse your program or parts of it. The book explains DSL construction, serialization, null safety aspects, and type parameterization to help you build robust apps. You'll learn how to destructure expressions and write your own. You'll then get to grips with building scalable apps by exploring advanced topics such as testing, concurrency, microservices, coroutines, and Kotlin DSL builders. Furthermore, you'll be introduced to the kotlinx.serialization framework, which is used to persist objects in JSON, Protobuf, and other formats. By the end of this book, you'll be well versed with all the new features in Kotlin and will be able to build robust applications skillfully.
Table of Contents (21 chapters)
Free Chapter
1
Section 1: Fundamental Concepts in Kotlin
5
Section 2: Practical Concepts in Kotlin
15
Section 3: Advanced Concepts in Kotlin

Testing in Kotlin

One of the first things developers often do when adopting or evaluating a new language is that they roll it out gradually, starting with unit tests. The advantage of using this approach is that since your tests are not going into production, any issues with the language or bugs in the language library won't impact the real code. It gives the developers a chance to evaluate whether the language is a good fit for their needs, without worrying about the need to rewrite critical parts of their main code base if they decide to reject the new language.

In this chapter, we will introduce a powerful Kotlin testing library known as KotlinTest. This open source library is available on GitHub. By leveraging the powerful features of Kotlin, it provides useful testing features beyond what the typical Java test frameworks, such as JUnit or TestNG, currently offer.

The...