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22. Developer Testing
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Java Example of a Program Whose Data Flow Is to Be Tested
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if ( Condition 1 ) { x = a; } else { x = b; } if ( Condition 2 ) { y = x + 1; } else { y = x - 1; }
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To cover every path in the program, you need one test case in which Condition 1 is true and one in which it s false. You also need a test case in which Condition 2 is true and one in which it s false. This can be handled by two test cases: Case 1 (Condition 1=True, Condition 2=True) and Case 2 (Condition 1=False, Condition 2=False). Those two cases are all you need for structured basis testing. They re also all you need to exercise every line of code that defines a variable; they give you the weak form of data-flow testing automatically. To cover every defined-used combination, however, you need to add a few more cases. Right now you have the cases created by having Condition 1 and Condition 2 true at the same time and Condition 1 and Condition 2 false at the same time:
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But you need two more cases to test every defined-used combination. You need: (1) x = a and then y = x - 1 and (2) x = b and then y = x + 1. In this example, you can get these combinations by adding two more cases: Case 3 (Condition 1=True, Condition 2=False) and Case 4 (Condition 1=False, Condition 2=True). A good way to develop test cases is to start with structured basis testing, which gives you some if not all of the defined-used data flows. Then add the cases you still need to have a complete set of defined-used data-flow test cases.
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22. Developer Testing
Page 15
As discussed in the previous subsection, structured basis testing provided six test cases for the routine on page TBD. Data-flow testing of each defined-used pair requires several more test cases, some of which are covered by existing test cases and some of which aren t. Here are all the data-flow combinations that add test cases beyond the ones generated by structured basis testing:
Case 7 8 9 Test Description Define companyRetirement in line 12 and use it first in line 26. This isn t necessarily covered by any of the previous test cases. Define companyRetirement in line 15 and use it first in line 31. This isn t necessarily covered by any of the previous test cases. Define companyRetirement in line 17 and use it first in line 31. This isn t necessarily covered by any of the previous test cases.
Once you run through the process of listing data-flow test cases a few times, you ll get a sense of which cases are fruitful and which are already covered. When you get stuck, list all the defined-used combinations. That might seem like a lot of work, but it s guaranteed to show you any cases that you didn t test for free in the basis-testing approach.
Equivalence Partitioning
Equi valence partitioning is discussed in far more depth in the books listed in the Additional Resources section at the end of this chapter.
4 CROSS-REFERENCE
A good test case covers a large part of the possible input data. If two test cases flush out exactly the same errors, you need only one of them. The concept of equivalence partitioning is a formalization of this idea and helps reduce the number of test cases required. In the listing on page TBD, line 7 is a good place to use equivalence partitioning. The condition to be tested is m_employee[ ID ].governmentRetirementWithheld < MAX_GOVT_RETIREMENT. This case has two equivalence classes: the class in which m_employee[ ID ].governmentRetirementWithheld is less than MAX_GOVT_RETIREMENT and the class in which it s greater than or equal to MAX_GOVT_RETIREMENT. Other parts of the program may have other, related equivalence classes that imply that you need to test more than two possible values of m_employee[ ID ].governmentRetirementWithheld, but as far as this part of the program is concerned, only two are needed. Thinking about equivalence partitioning won t give you a lot of new insight into a program when you have already covered the program with basis and data-flow testing. It s especially helpful, however, when you re looking at a program from the outside (from a specification rather than the source code), or when the data is complicated and the complications aren t all reflected in the program s logic.
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