An early start to testing
reduces the cost and time to rework and produce error-free software that is
delivered to the client. However in Software Development Life Cycle (SDLC),
testing can be started from the Requirements Gathering phase and continued till
the deployment of the software. It also depends on the development model that
is being used. For example, in the Waterfall model, formal testing is conducted
in the testing phase; but in the incremental model, testing is performed at the
end of every increment/iteration and the whole application is tested at the end.
Testing is done
in different forms at every phase of SDLC:
● During the requirement gathering phase,
the analysis and verification of requirements are also considered as testing.
● Reviewing the design in the design phase
with the intent to improve the design is also considered as testing.
● Testing performed by a developer on
completion of the code is also categorized as testing.