You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: timestamp_test.go
    path of file: ./repos/cosmos-sdk/orm/encoding/ormfield
    
    the code of the file until where you have to start completion: package ormfield_test

import (
	"bytes"
	"testing"
	"time"

	"google.golang.org/protobuf/reflect/protoreflect"
	"google.golang.org/protobuf/types/known/timestamppb"
	"gotest.tools/v3/assert"

	"cosmossdk.io/orm/encoding/ormfield"
)

func TestTimestamp(t *testing.T) {
	t.Parallel()
	cdc := ormfield.TimestampCodec{}

	t.Run("nil value", func(t *testing.T) {
		t.Parallel()
		buf := &bytes.Buffer{}
		assert.NilError(t, cdc.Encode(protoreflect.Value{}, buf))
		assert.Equal(t, 1, len(buf
    
func TestTimestamp(t *testing.T) {
	t.Parallel()
	cdc := ormfield.TimestampCodec{}

	t.Run("nil value", func(t *testing.T) {
		t.Parallel()
		buf := &bytes.Buffer{}
		assert.NilError(t, cdc.Encode(protoreflect.Value{}, buf))
		assert.Equal(t, 1, len(buf.Bytes()))
		val, err := cdc.Decode(buf)
		assert.NilError(t, err)
		assert.Assert(t, !val.IsValid())
	})

	t.Run("no nanos", func(t *testing.T) {
		t.Parallel()
		ts := timestamppb.New(time.Date(2022, 1, 1, 12, 30, 15, 0, time.UTC))
		val := protoreflect.ValueOfMessage(ts.ProtoReflect())
		buf := &bytes.Buffer{}
		assert.NilError(t, cdc.Encode(val, buf))
		assert.Equal(t, 6, len(buf.Bytes()))
		val2, err := cdc.Decode(buf)
		assert.NilError(t, err)
		assert.Equal(t, 0, cdc.Compare(val, val2))
	})

	t.Run("nanos", func(t *testing.T) {
		t.Parallel()
		ts := timestamppb.New(time.Date(2022, 1, 1, 12, 30, 15, 235809753, time.UTC))
		val := protoreflect.ValueOfMessage(ts.ProtoReflect())
		buf := &bytes.Buffer{}
		assert.NilError(t, cdc.Encode(val, buf))
		assert.Equal(t, 9, len(buf.Bytes()))
		val2, err := cdc.Decode(buf)
		assert.NilError(t, err)
		assert.Equal(t, 0, cdc.Compare(val, val2))
	})

	t.Run("min value", func(t *testing.T) {
		t.Parallel()
		ts := timestamppb.New(time.Date(1, 1, 1, 0, 0, 0, 0, time.UTC))
		val := protoreflect.ValueOfMessage(ts.ProtoReflect())
		buf := &bytes.Buffer{}
		assert.NilError(t, cdc.Encode(val, buf))
		assert.Equal(t, 6, len(buf.Bytes()))
		assert.Assert(t, bytes.Equal(buf.Bytes(), []byte{0, 0, 0, 0, 0, 0})) // the minimum value should be all zeros
		val2, err := cdc.Decode(buf)
		assert.NilError(t, err)
		assert.Equal(t, 0, cdc.Compare(val, val2))
	})

	t.Run("max value", func(t *testing.T) {
		t.Parallel()
		ts := timestamppb.New(time.Date(9999, 12, 31, 23, 59, 59, 999999999, time.UTC))
		val := protoreflect.ValueOfMessage(ts.ProtoReflect())
		buf := &bytes.Buffer{}
		assert.NilError(t, cdc.Encode(val, buf))
		assert.Equal(t, 9, len(buf.Bytes()))
		val2, err := cdc.Decode(buf)
		assert.NilError(t, err)
		assert.Equal(t, 0, cdc.Compare(val, val2))
	})
}