1.Unit test
Unit test is the testing functional
(Or testing in detail of each function in the system) to ensure
that each individual function in the system can work well.
Unit testing is very important in software development because
it is the method for finding the functional problems (It can decrease
the time in finding bugs in the posterior process).
2.Integration test
Integration test is the testing that take each unit to
combine altogether and then test the coherence between each unit to
ensure that the communication between each unit in the system can
be done correctly.
3.System test
System test is the testing of the whole system to ensure that
the totally work-flow of the system is correct.It is also
an important test that have to do in software development process
(Normally system test is done as the last test of all
testing procedure).
4.Acceptance Test
Acceptance test is the testing of customer or user who will
use the developed software.It is the test for satisfaction of the
user or customer.This testing is done after System test.

The important testing that you must emphasize on them are
Unit testing and Integration testing because many defect or bugs
can be found by these two testing method.

Testing is not necessary to be done by tester but developer
can also do the testing.Normally the Unit testing is done by
developer because the majority of this testing use the test case
that depend on the implementation, so nobody can do this testing
better than developer.However the real tester have a responsibility
for doing the Integration test and System test because…

– These two kinds of testing must do in long time.

– To prevent the bias if the developer is also the tester at the
same time.(The developer who write the code maybe
rather sure that the code they wrote is correct and will
ignore some minor part of code that have to test)

– The real tester has more time to design the test document
and test case. He/She must know clearly in the target system
that will be tested,so He/She can do the testing better than
developer.

This is part I of software testing story.In the next part (part II)
I will write about black box and white box testing,test first method and
how to design the test plan.

Thank you very much,
Jitkasem Pintaya.

Related posts:

1. Software testing part II (White Box and Black Box testing)
2. Stubs and Drivers testing
3. Performance Testing and Regression Testing