Property-based testing with PropEr, Erlang, and Elixir : find bugs before your users do / Fred Hebert.

Format:

Book

Author/Creator:

Hebert, Fred, author.

Series:

Pragmatic programmers.

Pragmatic Programmers

Language:

English

Subjects (All):

Computer software--Testing.

Computer software.

ERLANG (Computer program language).

Elixir (Computer program language).

Physical Description:

1 online resource (367 pages).

Edition:

1st edition

Place of Publication:

Raleigh, North Carolina : Pragmatic Bookshelf, [2019]

System Details:

text file

Summary:

Property-based testing helps you create better, more solid tests with little code. By using the PropEr framework in both Erlang and Elixir, this book teaches you how to automatically generate test cases, test stateful programs, and change how you design your software for more principled and reliable approaches. You will be able to better explore the problem space, validate the assumptions you make when coming up with program behavior, and expose unexpected weaknesses in your design. PropEr will even show you how to reproduce the bugs it found. With this book, you will be writing efficient property-based tests in no time. Most tests only demonstrate that the code behaves how the developer expected it to behave, and therefore carry the same blind spots as their authors when special conditions or edge cases show up. Learn how to see things differently with property tests written in PropEr. Start with the basics of property tests, such as writing stateless properties, and using the default generators to generate test cases automatically. More importantly, learn how to think in properties. Improve your properties, write custom data generators, and discover what your code can or cannot do. Learn when to use property tests and when to stick with example tests with real-world sample projects. Explore various testing approaches to find the one that's best for your code. Shrink failing test cases to their simpler expression to highlight exactly what breaks in your code, and generate highly relevant data through targeted properties. Uncover the trickiest bugs you can think of with nearly no code at all with two special types of properties based on state transitions and finite state machines. Write Erlang and Elixir properties that generate the most effective tests you'll see, whether they are unit tests or complex integration and system tests. What You Need Basic knowledge of Erlang, optionally Elixir For Erlang tests: Erlang/OTP >= 20.0, with Rebar >= 3.4.0 For Elixir tests: Erlang/OTP >= 20.0, Elixir >= 1.5.0

Contents:

Part 1. The basics. Foundations of property-based testing

Writing properties

Thinking in properties

Custom generators

Part 2. Stateless properties in practice. Responsible testing

Properties-driven development

Shrinking

Targeted properties

Part 3. Stateful properties. Stateful properties

Case study: bookstore

State machine properties

A1. Solutions

A2. Elixir translations

A3. Installing postgreSQL

A4. Generators reference.

Notes:

Includes index.

Description based on print version record.

Includes bibliographical references.

ISBN:

9781680506549

1680506544

9781680506556

1680506552

9781680506532

1680506536

OCLC:

1090353628