Many statistics states that development line go in totally different direction from system or business requirement. System/application test comes to make sure that the developed system/application is what was expected and doing the function that this application originally designed for.
Software testing also helps to discover as many defects before production or final release. Beside that software performance test is very important to make sure that system or application will not crashed or be down under very high stress load. For example Millions of users, very large amount of data or download speed.
Developers usually don’t have time to test all combination for success or fail scenarios. so testers and QA are very important to find the unexpected behaviours in system.
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