Hi,

In any SAP Project testing can be happen in 3 phases.
Unit testing happens in Dev server.
Integration and User Acceptace Test happens in Quality 
Server.These all are done manually step by step.

We have got standard SAP Test Scripts/prepares based on the 
Client/company/Project.

Unit Testing: it can be tested in bits and pieces (Ex: 
Sales order Creation).

Integration Testing: OTC Flow (Create Sales order to 
Invoice).

User Acceptace done by the Client in "Q", if they are 
satisifed with the result they will give Sign-off for the 
project.
There is another sort of testing so called Automated 
Regression Testing. that can be done by eCATT/IBM Rational 
Tools.

Unit Testing 
When you test every single document is called unit testing.



Integration Testing 
It is purely with other modules and we have to check 
whether the FI testing is working with other related 
modules or not.


UAT 
When we test any particular document with the user and if 
it is ok immediately we have to take the signature on the 
document, which is signed off and can be forwarded to the 
immediate boss. There are some steps to be followed when we 
go for user acceptance testing.