Book Image

Software Test Design

By : Simon Amey
Book Image

Software Test Design

By: Simon Amey

Overview of this book

Software Test Design details best practices for testing software applications and writing comprehensive test plans. Written by an expert with over twenty years of experience in the high-tech industry, this guide will provide you with training and practical examples to improve your testing skills. Thorough testing requires a thorough understanding of the functionality under test, informed by exploratory testing and described by a detailed functional specification. This book is divided into three sections, the first of which will describe how best to complete those tasks to start testing from a solid foundation. Armed with the feature specification, functional testing verifies the visible behavior of features by identifying equivalence partitions, boundary values, and other key test conditions. This section explores techniques such as black- and white-box testing, trying error cases, finding security weaknesses, improving the user experience, and how to maintain your product in the long term. The final section describes how best to test the limits of your application. How does it behave under failure conditions and can it recover? What is the maximum load it can sustain? And how does it respond when overloaded? By the end of this book, you will know how to write detailed test plans to improve the quality of your software applications.
Table of Contents (21 chapters)
Part 1 – Preparing to Test
Part 2 – Functional Testing
Part 3 – Non-Functional Testing
Appendix – Example Feature Specification

Communication failure

As well as shutting a service down, tests should introduce another common, realistic problem – communication failure. Like system outages, these are real scenarios: blocking communication simulates a network outage while all the services are still running.

Blocking communication allows for a more specific test – you can let most of the system continue as normal and just restrict access between two particular processes. This can test specific failure scenarios, although they may be less realistic. You should work through different options, varying between large realistic outages and small specific failures that are less realistic but test distinct failure modes within the system.

You can also alter when communication failures occur. During a message sequence, test what happens if you fail to receive a reply to each message. Like white-box testing state machines, this ensures there is correct error handling at every stage. This will need careful...