Which one is subset of Regression testing smoke or Sanity?

Question

some site this mention about

Sanity 

"Sanity testing is a cursory testing, it is performed whenever a cursory testing is sufficient to prove the application is functioning according to specifications. This level of testing is a subset of regression testing."

 

but in your site it mention "Smoke testing is a subset of Regression testing"

 

so which is true somke testing is first so how can we say that the smoke is subset of regression testong 

Answer 1

When it comes to software testing, plenty of methodologies struck in mind. And Sanity testing is considered as the subsent of regression testing. Because smoke testing generally comes from hardware testing.