golang - codecoverage always shows coverage: 0.0% of statements

It helped me

Just add -coverpkg=./... option if tests are in sub folders:

go test ./... -v -coverpkg=./...

Try first:

go test -coverprofile=coverage.out

I then run, to see the result:

go tool cover -html=coverage.out

If the 1.3 version was installed through an upgrade of 1.1, 1.2, ..., you can try, as in issue 110:

I solved this by completely removing $GOPATH/src/code.google.com/p/go.tools and install cover again:

go get golang.org/x/tools/cmd/cover