func TestUnmarshalPartiallyPopulatedOptionalFieldsFails(t *testing.T) {
	// Fill in all fields, then randomly remove one.
	dataOut := &test.NinOptNative{
		Field1:  proto.Float64(0),
		Field2:  proto.Float32(0),
		Field3:  proto.Int32(0),
		Field4:  proto.Int64(0),
		Field5:  proto.Uint32(0),
		Field6:  proto.Uint64(0),
		Field7:  proto.Int32(0),
		Field8:  proto.Int64(0),
		Field9:  proto.Uint32(0),
		Field10: proto.Int32(0),
		Field11: proto.Uint64(0),
		Field12: proto.Int64(0),
		Field13: proto.Bool(false),
		Field14: proto.String("0"),
		Field15: []byte("0"),
	}
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	fieldName := "Field" + strconv.Itoa(r.Intn(15)+1)
	field := reflect.ValueOf(dataOut).Elem().FieldByName(fieldName)
	fieldType := field.Type()
	field.Set(reflect.Zero(fieldType))
	encodedMessage, err := proto.Marshal(dataOut)
	if err != nil {
		t.Fatalf("Unexpected error when marshalling dataOut: %v", err)
	}
	dataIn := NidOptNative{}
	err = proto.Unmarshal(encodedMessage, &dataIn)
	if err.Error() != `proto: required field "`+fieldName+`" not set` {
		t.Fatalf(`err.Error() != "proto: required field "`+fieldName+`" not set"; was "%s" instead`, err.Error())
	}
}
//See another version of this test in proto/extensions_test.go
func TestGetExtensionStability(t *testing.T) {
	check := func(m *NoExtensionsMap) bool {
		ext1, err := proto.GetExtension(m, E_FieldB1)
		if err != nil {
			t.Fatalf("GetExtension() failed: %s", err)
		}
		ext2, err := proto.GetExtension(m, E_FieldB1)
		if err != nil {
			t.Fatalf("GetExtension() failed: %s", err)
		}
		return ext1.(*NinOptNative).Equal(ext2)
	}
	msg := &NoExtensionsMap{Field1: proto.Int64(2)}
	ext0 := &NinOptNative{Field1: proto.Float64(1)}
	if err := proto.SetExtension(msg, E_FieldB1, ext0); err != nil {
		t.Fatalf("Could not set ext1: %s", ext0)
	}
	if !check(msg) {
		t.Errorf("GetExtension() not stable before marshaling")
	}
	bb, err := proto.Marshal(msg)
	if err != nil {
		t.Fatalf("Marshal() failed: %s", err)
	}
	msg1 := &NoExtensionsMap{}
	err = proto.Unmarshal(bb, msg1)
	if err != nil {
		t.Fatalf("Unmarshal() failed: %s", err)
	}
	if !check(msg1) {
		t.Errorf("GetExtension() not stable after unmarshaling")
	}
}
var (
	marshaler = Marshaler{}

	marshalerAllOptions = Marshaler{
		Indent: "  ",
	}

	simpleObject = &pb.Simple{
		OInt32:     proto.Int32(-32),
		OInt64:     proto.Int64(-6400000000),
		OUint32:    proto.Uint32(32),
		OUint64:    proto.Uint64(6400000000),
		OSint32:    proto.Int32(-13),
		OSint64:    proto.Int64(-2600000000),
		OFloat:     proto.Float32(3.14),
		ODouble:    proto.Float64(6.02214179e23),
		OBool:      proto.Bool(true),
		OString:    proto.String("hello \"there\""),
		OBytes:     []byte("beep boop"),
		OCastBytes: pb.Bytes("wow"),
	}

	simpleObjectJSON = `{` +
		`"o_bool":true,` +
		`"o_int32":-32,` +
		`"o_int64":"-6400000000",` +
		`"o_uint32":32,` +
		`"o_uint64":"6400000000",` +
		`"o_sint32":-13,` +
		`"o_sint64":"-2600000000",` +
		`"o_float":3.14,` +
				GroupField: proto.Int32(6),
			},
			RepBytes: [][]byte{[]byte("sham"), []byte("wow")},
		},
	},
	// Check that a scalar bytes field replaces rather than appends.
	{
		src:  &pb.OtherMessage{Value: []byte("foo")},
		dst:  &pb.OtherMessage{Value: []byte("bar")},
		want: &pb.OtherMessage{Value: []byte("foo")},
	},
	{
		src: &pb.MessageWithMap{
			NameMapping: map[int32]string{6: "Nigel"},
			MsgMapping: map[int64]*pb.FloatingPoint{
				0x4001: {F: proto.Float64(2.0)},
			},
			ByteMapping: map[bool][]byte{true: []byte("wowsa")},
		},
		dst: &pb.MessageWithMap{
			NameMapping: map[int32]string{
				6: "Bruce", // should be overwritten
				7: "Andrew",
			},
		},
		want: &pb.MessageWithMap{
			NameMapping: map[int32]string{
				6: "Nigel",
				7: "Andrew",
			},
			MsgMapping: map[int64]*pb.FloatingPoint{