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Boundary Testing
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Often errors happen at boundaries between domains. In source code, decision statements determine the boundaries. If a decision statement is written as x<1 instead of x<0, the boundary has shifted. If a decision is written x=<1, then the boundary, x=1, is in the true subdomain. In the terminology of boundary testing, we say that the on tests are in the true domain and the o tests are values of x greater than 1 and are in the false domain. If a decision is written x<1 instead of x=<1, then the boundary, x=1, is now in the false subdomain instead of in the true subdomain. Boundary testing is aimed at ensuring that the actual boundary between two subdomains is as close as possible to the speci ed boundary. Thus, test cases are selected on the boundary and o the boundary as close as reasonable to the boundary. The standard boundary test is to do two on tests as far apart as possible and one o test close to the middle of the boundary. Figure 10-3 shows a simple boundary. The arrow indicates that the on tests of the boundary are in the subdomain below the boundary. The two on tests are at the ends of the boundary and the o test is just above the boundary halfway along the boundary.
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Fig. 10-3.
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Boundary conditions.
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EXAMPLE 10.14
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In the triangle example, the primitive conditions, a > b c or b > a c or c > a b, determine a boundary. Since these are in three variables, the boundary is actually a plane in 3D space. The on tests would be two (or more) widely separated tests that have equality for example, (8,1,7) and (8,7,1). These are both true. The off test would be in the other domain (false) and would be near the middle for example, (7.9, 4,4).
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Note: For a discussion of object-oriented (OO) testing, see 13.
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CHAPTER 10 Software Testing
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Review Questions
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1. What are the basic concerns with software testing 2. Why is a speci cation needed in order to do testing 3. Why is path testing usually impractical 4. Does path testing subsume statement coverage 5. Software testers have sometimes said errors happen in corners. What could this mean 6. Every-statement coverage is not a subdomain testing criterion. What is the signi cance of this 7. How would the operational pro le be di erent for a point-of-sale terminal in a discount store from a point-of-sale terminal in a ritzy store 8. A software developer may unconsciously not test his or her software thoroughly. Why would a testing coverage criterion help
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Problems
1. If a program has two integer inputs and each can be 32-bit integer, how many possible inputs does this program have 2. If a program has 264 possible inputs and one test can be run every millisecond, how long would it take to execute all of the possible inputs 3. A payroll program will calculate the weekly gross pay given an input of the number of hours worked and current wages. A worker may not work more than 80 hours per week, and the maximum wage is $50.00 per hour. Construct functional tests. 4. A program calculates the area of a triangle. The inputs are three sets of x,y coordinates. Construct functional tests. 5. A program accepts two times (in 12-hour format) and outputs the elapsed number of minutes. Construct functional tests. 6. A binary search routine searches a list of names in alphabetical order and returns true if the name is in the list and returns false otherwise. Construct functional tests. 7. For the payroll program in Problem 10.3, identify the conditions and construct the test matrix. 8. For the area of the triangle calculation of Problem 10.4, identify the conditions and construct the test matrix. 9. For the elapsed time calculator of Problem 10.5, identify the conditions and construct the test matrix.
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