what is sanity testing code example

Example 1: what is sanity testing

Usually I do sanity test after bug fixes
to check everything works properly and
I don't have a test data

Example 2: sanity test vs smoke test

Usually I do sanity test after bug fixes
to check everything works properly and
I don't have a test data and I don't 
document it but on the other hand 
smoke test needs to be documented.