Added metric worker unit tests
Added metric worker unit tests

Signed-off-by: mrsaicharan1 <5d1ff55e3c20c319c834f145fd90765cc69a195f@gmail.com>
Signed-off-by: Manan Goel <a3cbe98e2cc9cdaf4af3e4e69ac74b9b0bcd8ca7@research.iiit.ac.in>

OSSHealth/ghdata,OSSHealth/ghdata,OSSHealth/ghdata