Testing whether the basic functionalities of the system are 
working properly or not comes under sanity testing.This is 
done to ensure that the developed application or system is 
testable or not

Sanity or smoke testing is a pre-testing effort to 
determine if a new software version is performing well 
enough to accept it for a major testing effort. For 
example, if the new software is crashing systems every five 
minutes, the software may not be in a sane enough condition 
to warrant further testing in its current state