What is the difference between unit testing and integration testing?

What is the difference between unit testing and integration
testing?

Question Posted / kavitas_k

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What is the difference between unit testing and integration testing?..

Answer / rafi

Unit testing:A unit is smallest entity in a software.Every
unit has to tested separately in order to check whether
it's as per the requirement specifiacation

Integration testing:The tested unit are integrated into one
module and each module is tested separately in order check
whether it's as per the requirement specification.

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What is the difference between unit testing and integration testing?..

Answer / biju

Unit Test cases
The responsible people for the Unit Test cases are the
programmers. Are they able to test and find defects for the
product they developed? The Answer would be Yes and No.
Because when the developer created his module obviously he
will think that his work will always be correct and he will
not be able to visualize the defects. Hence there is chance
for the programmer to skip the unit test cases and
execution. But if properly the Unit test cases are written
and executed the defect ration will come down drastically
and the Testers will be able to concentrate on the Black
box.

The Good Unit Test cases are hard to write and time
consuming. The developers have to spend time to write such
effective unit test cases similar to writing Code. Poor
Unit test cases will also prove the efficiency and
understanding of the requirement by the developers. Not all
developers who are good in writing code are good in writing
Test cases.

Writing Unit test cases is a skilled task and which is the
basic testing done before the code is delivered to the
quality. Hence more attention should be given in writing
Unit Test cases.

Integration Testing

A project may have many modules. Not all modules are worked
together. Certain modules are covered in first iteration
and remaining is in forth coming iterations. When one
module is completed it should be integrated with other
modules. If the project is small in size the system are
assembled and the integration will happen at the end.

The integration testing will be performed on multiple
environments also. Some times the client may user different
environment and the solution provider may have a different
one. At that time the integration process is a must.
Usually the integration testing is conducted in parallel
with the Unit Testing.

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What is the difference between unit testing and integration testing?..

Answer / shiva

unit testing:

In this stage white box test engineers will check each& every developed programs&combination of programs,in order to conform weather it is working according to the exportations or not.

Integration testing:

The developers will develop the interfaces in order to integrate the modules.
1)the white box test engineers will check wether the interfaces are working fine or not.

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