# Run env GO111MODULE=off cd vend/hello go run hello.go stdout 'hello, world' -- vend/hello/hello.go -- package main import ( "fmt" "strings" // really ../vendor/strings ) func main() { fmt.Printf("%s\n", strings.Msg) } -- vend/hello/hello_test.go -- package main import ( "strings" // really ../vendor/strings "testing" ) func TestMsgInternal(t *testing.T) { if strings.Msg != "hello, world" { t.Fatalf("unexpected msg: %v", strings.Msg) } } -- vend/vendor/strings/msg.go -- package strings var Msg = "hello, world"