Book Image

Scala Test-Driven Development

By : Gaurav Sood
Book Image

Scala Test-Driven Development

By: Gaurav Sood

Overview of this book

Test-driven development (TDD) produces high-quality applications in less time than is possible with traditional methods. Due to the systematic nature of TDD, the application is tested in individual units as well as cumulatively, right from the design stage, to ensure optimum performance and reduced debugging costs. This step-by-step guide shows you how to use the principles of TDD and built-in Scala testing modules to write clean and fully tested Scala code and give your workflow the change it needs to let you create better applications than ever before. After an introduction to TDD, you will learn the basics of ScalaTest, one of the most flexible and most popular testing tools around for Scala, by building your first fully test-driven application. Building on from that you will learn about the ScalaTest API and how to refactor code to produce high-quality applications. We’ll teach you the concepts of BDD (Behavior-driven development) and you’ll see how to add functional tests to the existing suite of tests. You’ll be introduced to the concepts of Mocks and Stubs and will learn to increase test coverage using properties. With a concluding chapter on miscellaneous tools, this book will enable you to write better quality code that is easily maintainable and watch your apps change for the better.
Table of Contents (16 chapters)
Scala Test-Driven Development
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface

Problem statement


We will extend our example from the previous chapter about base conversion so that we can convert from decimal to hexadecimal and vice versa.

Feature – decimal to hexadecimal conversion

As a user, I want to convert a decimal number to a hexadecimal number.

Scenario 1:

  • Given a decimal number A

  • When I convert this number to a hexadecimal number

  • Then, I get a hexadecimal equivalent B of the original decimal number

Scenario 2:

  • Given a hexadecimal number X

  • When I convert this number to a decimal number

  • Then, I get decimal equivalent Y of the original hexadecimal number

Scenario 3:

  • Given a decimal number A

  • When I convert A to hexadecimal to get hexadecimal number B

  • And I again convert B to decimal number C

  • Then, A is equal to C

Let's apply some of the knowledge we gained in this chapter, so we can take another step toward reusable and clean test code for our example application. In TDD, test code is equally if not more important than the application code.

Now that we are looking at...