In "V" model of SDLC Correspond to integration testing will
be  design.

The design phase corresponds to the integration testing as 
this is the phase where different modules / sub systems of 
a system are defined. After this phase only the integration 
test scenarios / cases can be written.

In the V Model hte integration testing corresponds to the 
design phase. As this is the phase where the high level 
design and functionality of the application will be 
determined before coding them. At the coding level, unit 
testing would be done and then when coding is complete it 
and unit testing is over, the integration testing would be 
done. The integration test cases would derive their input 
from the design specifications document.