Software Testing Techniques

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Today let me discuss an important topic "Software Testing Techniques"..

	Black-Box Testing techniques: When creating black-box test cases, the input data  used is critical. Three successful techniques for  managing the amount of input data required include: Equivalence Partitioning. An equivalence class is a subset of data that is representative  of a larger class.Equivalence partitioning is a technique  for testing equivalence classes rather thanundertaking exhaustive testing of each value of the larger class.  For example, aprogram which edits credit limits within a given range (1,000 - 1,500) would have three equivalence classes: < 1,000 (invalid) Between 1,000 and 1,500 (valid) > 1,500 (invalid) Boundary Analysis: A technique that consists of developing test cases and  data that focus on the input and output boundaries of a  given function. In same credit limit example, boundary analysis would test: Low boundary +/- one (999 and 1,001) On the boundary (1,000 and 1,500) Upper boundary +/- one (1,499 and 1,501) Error Guessing: Test cases can be developed based upon the intuition  and experience of the tester. For example, in an example  where one of the inputs is the date, a tester may try February 29, 2000.. It is not possible..  White-Box Testing techniques: White-box testing assumes that the path of logic in a unit  or program is known. White-box testing consists of testing paths, branch by branch, to produce predictable results.  The following are white-box testing techniques: Statement Coverage: Execute all statements at least once. Decision Coverage: Execute each decision direction at least once. Condition Coverage: Execute each decision with all possible outcomes at least once. Decision/Condition Coverage: Execute all possible combinations of condition outcomes in each decision. Treat all iterations as two-way conditions exercising the loop zero times and one time.