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

Trading off precision versus brittleness in automated testing

In manual testing, the checks are as precise as the test plan specifies and the experience of the tester performing them. In automated testing, you have to decide the level of detail of the checks you perform, and there is a trade-off between the precision of your tests and how susceptible they are to break in the future, as shown here:

Figure 5.5 – Trading off precision versus resilience in tests

The more precise and detailed you make your tests, the slower and more brittle they will be, liable to break due to small or inconsequential changes. However, in making them faster and more resilient, they will generally become more vague or superficial. While there is no escaping that trade-off, some guidelines can help.

For system testing, you can apply the same rules as you did for the specification – test the behavior, not the implementation. It doesn’t matter about the internal...