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: secretbox_test.go
    path of file: ./repos/go-micro/config/secrets/secretbox
    
    the code of the file until where you have to start completion: package secretbox

import (
	"encoding/base64"
	"reflect"
	"testing"

	"go-micro.dev/v4/config/secrets"
)

func TestSecretBox(t *testing.T) {
	secretKey, err := base64.S
    
func TestSecretBox(t *testing.T) {
	secretKey, err := base64.StdEncoding.DecodeString("4jbVgq8FsAV7vy+n8WqEZrl7BUtNqh3fYT5RXzXOPFY=")
	if err != nil {
		t.Fatal(err)
	}

	s := NewSecrets()

	if err := s.Init(); err == nil {
		t.Error("Secretbox accepted an empty secret key")
	}
	if err := s.Init(secrets.Key([]byte("invalid"))); err == nil {
		t.Error("Secretbox accepted a secret key that is invalid")
	}

	if err := s.Init(secrets.Key(secretKey)); err != nil {
		t.Fatal(err)
	}

	o := s.Options()
	if !reflect.DeepEqual(o.Key, secretKey) {
		t.Error("Init() didn't set secret key correctly")
	}
	if s.String() != "nacl-secretbox" {
		t.Error(s.String() + " should be nacl-secretbox")
	}

	// Try 10 times to get different nonces
	for i := 0; i < 10; i++ {
		message := []byte(`Can you hear me, Major Tom?`)

		encrypted, err := s.Encrypt(message)
		if err != nil {
			t.Errorf("Failed to encrypt message (%s)", err)
		}

		decrypted, err := s.Decrypt(encrypted)
		if err != nil {
			t.Errorf("Failed to decrypt encrypted message (%s)", err)
		}

		if !reflect.DeepEqual(message, decrypted) {
			t.Errorf("Decrypted Message dod not match encrypted message")
		}
	}
}