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Component Testing

Component Testing is the way to testing the individual component separately. Component Testing is also called module testing or program Testing. Suppose any system have 5 components then all 5 component tested separately with efficiency called Component Testing.
Because of Component Testing done separately so here we use Driver and Stubs to provide them working same as system. Driver and Stub work like the missing software in Component Testing.

Let me explain it suppose any software have 3 component suppose P, Q and R. Only Q module developer and Manager told you to test it. How you will test it if Module P and R not developed. So here you can replace Module P and R with the dummy code these dummy code called Driver and Stub.

Stub is called from the tested software. In above example Module P behave like Stub.
Driver is calls the tested software. In above example Module R behave like Driver.

Component Testing perform just before the Integration Testing to make sure every Component of the software working correctly. 
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