Book Image

Learning Scala Programming

By : Vikash Sharma
Book Image

Learning Scala Programming

By: Vikash Sharma

Overview of this book

Scala is a general-purpose programming language that supports both functional and object-oriented programming paradigms. Due to its concise design and versatility, Scala's applications have been extended to a wide variety of fields such as data science and cluster computing. You will learn to write highly scalable, concurrent, and testable programs to meet everyday software requirements. We will begin by understanding the language basics, syntax, core data types, literals, variables, and more. From here you will be introduced to data structures with Scala and you will learn to work with higher-order functions. Scala's powerful collections framework will help you get the best out of immutable data structures and utilize them effectively. You will then be introduced to concepts such as pattern matching, case classes, and functional programming features. From here, you will learn to work with Scala's object-oriented features. Going forward, you will learn about asynchronous and reactive programming with Scala, where you will be introduced to the Akka framework. Finally, you will learn the interoperability of Scala and Java. After reading this book, you'll be well versed with this language and its features, and you will be able to write scalable, concurrent, and reactive programs in Scala.
Table of Contents (21 chapters)
Title Page
Packt Upsell
Contributors
Preface
Index

Chapter 15. Testing in Scala

"Change is the end result of all the true learning."

- Leo Buscaglia

Software development is an ever transforming process. We have seen in recent decades that many patterns have been discovered/rediscovered. These programming techniques/paradigms have become an important part and have changed the way we approach programming. One of them is Test-Driven Development (TDD). In the TDD approach, we first specify the requirement for our application through new tests. Then, one by one, we write concrete code to pass all those tests. In this manner, we complete our requirements by writing new test cases, implementing code to pass them, and end up building an application that runs as expected. Scala provides many frameworks for testing (for example, ScalaTest,Specs2, and so on) and we have Mockito and ScalaMock for mocking objects. Testing, in a way, is a small concept with a vast number of explanations possible. In this chapter, we'll focus on understanding the TDD approach...