Testing can begin right from the DAY 1 of the 
project/product development. The moment we have the 
Requirement Specifications, there is good scope for the QA 
team to have the System Test Cases.

in life cycle testing begins right from after completion of 
coding that is UNIT TESTING that comes under WHITE BOX 
TESTING after that integration testing after that SYSTEM 
TESTING i.e is BLACK BOX TESTING

We can start testing once the requirements are well 
understood.

Testing can begin only if we have final Requirements, code 
released to QA environment, and test cases written and test 
data setup is done and ready.

Hi this is Palguna,
I went for one of the interview and faced the same 
question.and i told that testing starts from the design 
phase.But the interviewer said testing starts from 
requirement phase itself is this correct .please give me 
the answer.