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Answer Posted / sandeep guttikonda
System Integration Testing (SIT) is the testing of the sub-
systems, as a whole, to ensure that they work as a system.
It is accomplished whenever multiple systems cross
functionality & external interface level testing is
required. Also, verifies that the system is integrated to
any external or third party systems defined in the system
requirements.
When it comes:
Unit testing-> Integration testing -> System testing ->
System integration testing.
Example:
I would like to explain about this SIT by taking a banking
application:
consider ICICI online banking application(these assumption
may not be true in real applicationi of ICICI):
Hope the reader know about the Loans: let's us consider
that a person came to take a personal loan from the bank
How the bank gives the loan it will consider certain
criterias like his previous bank statements his balances,
his properties, credit card bill payments etc etc..
1) unit testing: the developer will test the application(
front end) after he is done with the code.
2) Integration testing: considering this as a client server
application. Testing whether the front end information
(like values, addresses etc) are reflecting in the back end
bye checking at the back end and vise versa by checking at
the front end.
3)System testing: testing this application (system) as a
whole and based on the functionality. checking whether the
info giving at the front end is reflecting again at the
front end where ever necessary.
4)System integration testing: suppose in this appication to
generate the instrest information , payment information ,
etc if we are using some other application which is not
related to this application but integrated to this to
fulfill some task so testing this all functionally as a
whole.
still if you need any further info plz post again,
thanks.
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