Component Testing : Testing of individual software components.


Ex :- you have different functionalities (modules/sub
modules), those are either satisfying customer requirements
 or not. (BRS/SRS/FS)

Component Testing means testing the component of the 
system.A group of components is known as module.So a tester 
always starts his/her testing from the basic level i.e 
component of the application.

Component testing is nothing but unit testing .developer 
will do this tetsing.

in hardware component level testing is testing of individual
components whereas unit level testing is the entire unit
which may contain hundred of different kinds of components.
For example a test that may take 3 weeks with 10 units, will
take only half of the time if there is 2 of the component
under test in each unit, and a component level test being
done only on that particular component (if everything else
is assumed to be okay)/

component testing: the same as unit testing except that all 
stubs and simulators are replaced with the real thing.

Component Testing means Module Testing i.e we are testing 
each module or component differently. suppose there is one 
project which consists of 10 components and we are testing 
each component differently then it is known as component 
Testing, after component Testing Integration Testing is 
done. while doing Black Box Testing or White Box Testing by 
Tester first of all Component Testing is done.
Component Testing-Integration Testing-System Testing
The above is the actual scenerio before component Testing 
Unit Testing is done by the developers.
While doing Unit Testing the Developers runs each 
functions/method of the Component/Module.

Componnet testing searches for defects in and verifies the 
functioning of s/w(e.gModules,Programmes, Objects, Classess 
etc.)that are seperatly testable.Stubs, Drivers and 
Simulators may be used.Component testing occurs with access 
to the code being tested and with the support of the 
development enviornment(Unit test Framework or Debugging 
tool)Here defects are typically fixed as soon as they are 
found, without formally recording incidents.
Examples of Compnents are..
Memory leak, Robustness testing, Structural Testing(Branch 
Coverage)

testing of individual program components. it is the 
responsibility of components developer.

component testing is unit testing,