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Equivalence Class Partitiong and Boundary Condition Analysis
Why are there Bugs in Software?
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Equivalence Class Partitiong and Boundary Condition Analysis
Equivalence class partitioning is a timesaving practice that identifies tests that are equivalent to one
another; when two inputs are equivalent, you expect them to cause the identical sequence of operations to
take place or they cause the same path to be executed through the code. When two or more test cases are seen as equivalent, the rresource savings associated with not running the redundant tests normally outweighs the rsik.
An example of an equivalence class includes the testj g of a data-entry field in an HTML form. If the field
accepts a five-digit ZIP code(e.g, 22222) then it can reasonably be assumed that field will accept all other
five-digit ZIP codes (e.g. 33333, 44444, etc.)
In equivalence partitioning, both valid and invalid values are treated in this manner. For example, if entering
six letters into the ZIP code field just described results in an error message, then it can reasonably be assumed that all six-letter conbinations will result in the same error message. Similarly, if entering a four-digit number inti the ZIP code field results in an error message, then it should be assumed that all
four digit combinations will result in the same error message.
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