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

Policed and unpoliced limits

Rate limits are usually unpoliced – if you go over the specified rate, the application will do its best to service requests or perform the requested action. As we saw in Chapter 7, Testing of Error Cases, there are also policed limits, such as the number of configured users, which are designed to reject requests after a specified limit.

That might be a configured number of some entity, the maximum simultaneous connections, or the maximum number of operations your system can perform in parallel. Whatever the limits are in your system, identify them all and test what happens when you go beyond them. These tests are designed to fail, so the only question is, does the application fail gracefully, letting users know why their request can’t succeed?

You can also stress test these limits, repeatedly attempting to add more entities or connections beyond the maximum to ensure that an attack of that kind can’t degrade your system. This...