Software Engineering for Students A Programming Approach

282 Chapter 19 ■ Testing
19.2 There are four paths through the program, which can be exercised by the
following test data:
Test number Outcome
1 3 2 1 3
2 3 2 5 5
3 2 3 1 3
4 2 3 5 5
19.3 There are three paths through the program extract, including the path
where neither of the conditions in the if statements are true. But each
of the error messages can be triggered by two conditions. Suitable test
data is therefore:
Test number Row Column Outcome
1 5 6 OK
2 0 4 invalid
3 9 4 invalid
4 5 9 invalid
5 5 0 invalid
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Further Reading
This book surveys studies of the types of fault that occur and explains the different testing
methods, in a very readable way: Marc Roper, Software Testing, McGraw-Hill,
1994.
A readable practical review of testing techniques: Cem Kaner, Testing Computer
Software, John Wiley, 1999.
The following book describes lessons in debugging and testing learned at Microsoft.
The author, Steve Maguire, is a strong advocate of stepping through code using the
debugger as a good way of finding bugs. The examples given are in C: Steve
Maguire, Writing Solid Code, Microsoft Press, 1993.