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Why back-end testing is required, if we are going to check the front-end ....?
Software QA/Testing Technical FAQs
(Continued from previous question...)
Why back-end testing is required, if we are going to check the front-end ....?
Why we need to do unit testing, if all the features
are being tested in System testing. What extra things
are tested in unit testing, which can not be tested in
System testing.
Answer1:
Assume that you're thinking client-server or web. If you test the
application on the front end only you can see if the data was stored and
retrievd correctly. You can't see if the servers are in an error state or
not. many server processes are monitored by another process. If they crash,
they are restarted. You can't see that without looking at it.
The data may not be stored correctly either but the front end may have
cached data lying around and it will use that instead. The least you should
be doing is verifying the data as stored in the database.
It is easier to test data being transferred on the boundaries and see the
results of those transactions when you can set the data in a driver.
Answer2:
Back-End testing : Basically the requirement of this testing depends on ur
project. like Say if ur project is .Ticket booking system,Front end u will provided with
an Interface , where u can book the ticket by giving the appropriate details
( Like Place to go, and Time when u wanna go etc..). It will have a Data
storage system (Database or XL sheet etc) which is a Back end for storing
details entered by the user.
After submitting the details ,U might have provided with a correct
acknowledgement.But in back end , the details might not updated correctly
in Database becoz of wrong logic development. Then that will cause a major
problem.
and regarding Unit level testing and System testing
Unit level testing is for testing the basic checks whether the application
is working fyn with the basic requirements.This will be done by developers
before delivering to the QA.In System testing , In addition to the unit
checks ,u will be performing all the checks ( all possible integrated checks
which required) .Basically this will be carried out by tester
Answer3:
Ever heard about divide and conquer tactic ?
It is a same method applied in backend and frontend
testing.
A good back end test will help minimize the burden of
frontend test.
Another point is you can test the backend while
develope the frontend. A true pararelism could be
achived.
Backend testing has another problem which must
addressed before front end could use it. The problem
is concurency. Building a scenario to test concurency
is formidable task.
A complex thing is hard to test. To create such
scenarios will make you unsure which test you already
done and which you haven't.
What we need is an effective methods to test our
application. The simplest method i know is using
divide and conquer.
Answer4:
A wide range of errors are hard to see if you don't see the code. For
example, there are many optimizations in programs that treat special
cases. If you don't see the special case, you don't test the
optimization. Also, a substantial portion of most programs is error
handling. Most programmers anticipate more errors than most testers.
Programmers find and fix the vast majority of their own bugs. This is
cheaper, because there is no communication overhead, faster because
there is no delay from tester-reporter to programmer, and more
effective because the programmer is likely to fix what she finds, and
she is likely to know the cause of the problems she sees. Also, the
rapid feedback gives the programmer information about the weaknesses in
her programming that can help her write better code.
Many tests -- most boundary tests -- are done at the system level
primarily because we don't trust that they were done at the unit level.
They are wasteful and tedious at the system level. I'd rather see them
properly done and properly automated in a suite of programmer tests.
(Continued on next question...)
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