What is Boundary Value Testing ?

Boundary Value Testing(BVT) testing technique in Black box testing. It is testing technique to find whether application accepting the expected range of values and rejecting values which falls out of range.

For example for password it should accept alphabet character(a-z) and within 4 to 10 characters.

BVT done like this.

max:10 pass; max-1=9 pass; max+1=11 fail;
min=4 pass; min+1=5: pass; min-1=3 fail;

Also check corner value and check application is working properly or not.

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