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Black Box Testing Techniques:

1) Boundary Value Analysis  2) Equivalence Partitioning 

1)      Boundary Value Analysis:  Boundary Value Analysis is a technique of black box testing in which input values at the boundaries of the input domain are tested. It has been widely recognized that the input values at the extreme ends of, and just outside of, input domains tend to cause errors in system functionality.

In Boundary value Analysis values at, and just beyond, the boundaries of the input domain are used to generate test cases to ensure proper functionality of the system. Boundary Value Analysis is an excellent way to catch common user input errors which can disrupt proper program functionality.

Advantages:

a)      Very good at exposing potential user interface/user input problems

b)      Very clear guide lines on determining test cases

c)       Very small set of test cases generated

Disadvantages:

a)      Does not test all possible inputs

b)      Does not test dependencies between combinations of inputs

2)   Equivalence Partitioning:  Equivalence Partitioning is designed to minimize the number of test cases by dividing tests in such away that the system is expected to act the same way for all tests of each equivalence portion. Test inputs would be selected from each partition.

Advantages:

a)      Equivalence partitions are designed so that every possible input belongs to one and only one equivalence partition.

Disadvantages:

a)      Doesn�t test every input

b)      No guide lines for choosing inputs.

 

 

 

 
   

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