Functional Testing :
Validating the behavior of Application
Functional testing covers how well the system executes the functions it
is supposed to execute�including user commands, data manipulation, searches and
business processes, user screens, and integrations. Functional testing covers
the obvious surface type of functions, as well as the back-end operations (such
as security and how upgrades affect the system).
Although functional testing is often done toward the end of the
development cycle, it can�and should, say experts�be started much earlier.
Individual components and processes can be tested early on, even before it's
possible to do functional testing on the entire system.
Validating the Performance of Application
eg., BlackBox Testing
eg., Load Testing , Stress Testing
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