BVA means testing the edges of Input ranges.
When the application allows values only within a Range, We do not test the all values .We do test the smallest value ,biggest value and values just near them because mistakes usually occurs at the edges.
Because most software bugs happens at minimum ,Maximum and around the edges
EX: Age must be 10 to 40
we usually test 9,10,11,39,40 and 41 values
we accept 10,11,39 and 40 value
we do not accept 9 and 41
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