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

White-box checks

Just as in black-box testing, in white-box tests, you not only have to decide what test cases to run but also how to check that those tests have passed. When you have access to the code in white-box testing, you can do this at several levels.

At the level of individual lines of code under unit tests, you can specify the exact outputs of the different functions. Once again, this has all the strengths and weaknesses of unit testing – it is precise and comprehensive but cannot find errors when the functions are combined.

While running system tests, white-box knowledge lets testers see the code’s behavior in more detail. This lets you find other classes of issues that might cause subtle or invisible problems for users, such as inefficiencies in the code or two wrongs making a right, as described next.

Checking code inefficiencies

Code inefficiencies can include code that initially tries to do the wrong thing but there are retries, which means...