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: pluscode_test.go
    path of file: ./repos/photoprism/pkg/pluscode
    
    the code of the file until where you have to start completion: package pluscode

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestEncode(t *testing.T) {
	t.Run("germany", func(t *testing.T) {
		plusCode := Encode(48.56344833333333, 8.996878333333333)

		expected := "8FWCHX7W
    
func TestS2(t *testing.T) {
	t.Run("germany", func(t *testing.T) {
		token := S2("8FWCHX7W+")

		assert.Equal(t, "4799e3772d14", token)
	})
	t.Run("empty code", func(t *testing.T) {
		token := S2("")

		assert.Equal(t, "", token)
	})
	t.Run("invalid code", func(t *testing.T) {
		token := S2("xxx")

		assert.Equal(t, "", token)
	})
}