Book Image

Learn Scala Programming

By : Slava Schmidt
Book Image

Learn Scala Programming

By: Slava Schmidt

Overview of this book

The second version of Scala has undergone multiple changes to support features and library implementations. Scala 2.13, with its main focus on modularizing the standard library and simplifying collections, brings with it a host of updates. Learn Scala Programming addresses both technical and architectural changes to the redesigned standard library and collections, along with covering in-depth type systems and first-level support for functions. You will discover how to leverage implicits as a primary mechanism for building type classes and look at different ways to test Scala code. You will also learn about abstract building blocks used in functional programming, giving you sufficient understanding to pick and use any existing functional programming library out there. In the concluding chapters, you will explore reactive programming by covering the Akka framework and reactive streams. By the end of this book, you will have built microservices and learned to implement them with the Scala and Lagom framework.
Table of Contents (19 chapters)


Defining properties is the most important aspect of PBT. It is impossible to test a system properly without having good properties definition. The transition from testing scenarios to properties is usually the hardest part for developers starting to adopt PBT.

Therefore, it is useful to have some kind of system which would help to approach the task of defining a property in a systematic manner. Often, the first step in systematizing something is classification.

Types of properties

We already said that there are universally quantified and conditional properties, depending upon if some property holds always or just for some subset of all possible inputs. Now, we want to break down properties in different dimensions...