I was testing a developed object. There are two types of
testing 

- Negative testing  

- Positive testing 

In negative testing we will give negative data in input and
we check any errors occurs. 

In positive testing we will give positive data in input for
checking errors.

Generally,A Abaper will do only unit testing...

testing is done with the provided data at the time of 
development to check u'r changes..

IF u have to write a code to add A and B to get c.
after writing the code ,u will run the program with 
provided data to check the desired output..
input a= 1
      b = 2.
      c = 3 ..
unit test is correct !!!done ...dev completed.
u hav code the requirement..

Regresion testing and integration testing will be done by 
function consultant...