Appendix L - Boundary Value Analysis Example

Summary

Introduction

This appendix contains an example illustrating the testing technique of boundary value analysis described in Chapter 3, which the test analyst can use to select specimen data for use in testing the application under test (AUT). This example uses the same testing problem as that presented in Appendix K – Equivalence Partition Example.

The Testing Problem

The specification for a software system for validating expenses claims for hotel accommodation includes the following requirements:

• There is an upper limit of £90

• Any claims above £90 should be rejected and cause an error message to be displayed

• All expense amounts should be greater than £0 and an error message should be displayed if this is not the case.

Analyzing the Testing Requirements

To support the process of analyzing the previous requirement, it is of benefit to graphically show the boundaries and to determine the boundary values and significant values either side of the boundaries (see Figure L1).

Designing the Test Cases

The next step is to design the test cases by drawing up a table showing the test case ID, the values about and on the boundary to be input for the test, the boundary it tests, and the expected output or result of the test case (see Table L1).