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    Boundary Value Analysis


    A D V E R T I S E M E N T



    Home » Boundary Value Analysis » Rules for Test Cases

    Rules for Test Cases


    1. If the condition is a range of values, create valid test cases for each end of the range and invalid test cases just beyond each end of the range. For example, if a valid range of quantity on hand is -9,999 through 9,999, write test cases that include:

    1. the valid test case quantity on hand is -9,999
    2. the valid test case quantity on hand is 9,999
    3. the invalid test case quantity on hand is -10,000 and
    4. the invalid test case quantity on hand is 10,000

    You may combine valid classes wherever possible, just as you did with equivalence partitioning, and, once again, you may not combine invalid classes. Don�t forget to consider output conditions as well. In our inventory example the output conditions generate the following test cases:

    1. the valid test case total quantity on hand is 0
    2. the valid test case total quantity on hand is 999,999
    3. the invalid test case total quantity on hand is -1 and
    4. the invalid test case total quantity on hand is 1,000,000

    2. A similar rule applies where the, condition states that the number of values must lie within a certain range select two valid test cases, one for each boundary of the range, and two invalid test cases, one just below and one just above the acceptable range.

    3. Design tests that highlight the first and last records in an input or output file.

    4.Look for any other extreme input or output conditions, and generate a test for each of them.



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