Most of the MNC companies uses this technique to debug any programme or application. It is basically a testing technique.
A programmer should be able to create and run an algorithm.In addition to that a programmer must make sure that his/her algorithm works with any range of inputs.
In Cryptography, stress testing is used to check encoding or decoding any information works for any cipher text. This technique ensures that conversion algorithm is succeeded in every aspect.
It plays a vital role for cryptographer.