package descriptor_test import ( "fmt" "testing" "github.com/golang/protobuf/descriptor" tpb "github.com/golang/protobuf/proto/test_proto" protobuf "github.com/golang/protobuf/protoc-gen-go/descriptor" ) func TestMessage(t *testing.T) { var msg *protobuf.DescriptorProto fd, md := descriptor.ForMessage(msg) if pkg, want := fd.GetPackage(), "google.protobuf"; pkg != want { t.Errorf("descriptor.ForMessage(%T).GetPackage() = %q; want %q", msg, pkg, want) } if name, want := md.GetName(), "DescriptorProto"; name != want { t.Fatalf("descriptor.ForMessage(%T).GetName() = %q; want %q", msg, name, want) } } func Example_options() { var msg *tpb.MyMessageSet _, md := descriptor.ForMessage(msg) if md.GetOptions().GetMessageSetWireFormat() { fmt.Printf("%v uses option message_set_wire_format.\n", md.GetName()) } // Output: // MyMessageSet uses option message_set_wire_format. }