Answer Posted / b singh
A back end is the engine of any client/server system. If
the back end malfunctions, it may cause system deadlock,
data corruption, data loss and bad performance. Many front
ends log on to a single SQL server. A bug in a back end may
put serious impact on the whole system. Too many bugs in a
back end will cost tremendous resources to find and fix
bugs and delay the system developments.
It is very likely that many tests in a front end only hit a
small portion of a back end. Many bugs in a back end cannot
be easily discovered without direct testing.
Back end testing has several advantages: The back end is no
longer a "black box" to testers. Many bugs can be
effectively found and fixed in the early development stage.
Take Forecast LRS as an example; the number of bugs in a
back end was more than 30% of total number of bugs in the
project. When back end bugs are fixed, the system quality
is dramatically increased.
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