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

Stress testing with errors

Despite the harshness of tests that push your system beyond its limits, lab testing still misses conditions that will be present in real-life usage. The day your advert goes viral and loading jumps, you will still have all the packet loss, latency, and even the chance of internal failures of a typical day. For a complete test, remember to include these low-level issues in your testing.

As with load testing, to apply controlled errors, you must start with an error-free system (see the Technical requirements section in Chapter 12, Load Testing). To perform any of the tests in this chapter, you need a reliable setup with all the resources and equipment of the live system on controlled networks without packet loss or other issues. From that start point, you can apply loading and degradation combinations. Recall the sources of network degradation from Chapter 7, Testing of Error Cases:

  • Packet loss
  • Latency
  • Jitter
  • Re-ordering
  • Duplication...