As seen, the creation of unit tests and benchmark tests within Go is very simple and intuitive. The built in go test command allows various coverage capabilities. A little known capability of the go test tool is the ability to specify which packages you wish to generate coverage information about with the -coverpkg flag. Armed with this information, we can formulate a go test command that will be able to run against the main package in our program but collect coverage information about our handlers package:
go test -coverprofile=cov.txt -coverpkg ./handlers -run TestRunMain ./cmd/service/
The preceding command is saying run tests against the main package but collect the coverage information from ...
