env GO111MODULE=off

# Issue 23882

[short] skip

go test -coverpkg=all x
stdout ok[\s\S]+?coverage

[!race] stop

go test -coverpkg=all -race x
stdout ok[\s\S]+?coverage

-- x/x.go --
package x
import _ "runtime"
func F() {}

-- x/x_test.go --
package x
import "testing"
func TestF(t *testing.T) { F() }