Quality is delighting customers
dint asked u the origin.. if u knw answer then do reply..
Hi Veena ,
My first response is ... "Incorrect question "........ Because "these layers can't have separate functional test" .. they can be tested separately as Units or as Modules not as System..!
I hope you must be familiar with System testing ... and the answer is System testing ...
UI layer is Presentation layer through which you give Input , the same is validated by Business layer and it further redirects the request to Data Layer , and eventually the response comes back from Data Layer Via Business Layer to UI Layer .... So they can't be tested separately specially when it comes to Functionality ......