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: keys_test.go
    path of file: ./repos/magistrala/auth
    
    the code of the file until where you have to start completion: // Copyright (c) Abstract Machines
// SPDX-License-Identifier: Apache-2.0

package auth_test

import (
	"fmt"
	"testing"
	"time"

	"github.com/absmach/magistrala/auth"
	"github.com/stretchr/testify/assert"
)

func TestExpired(t *testing.T) {
	exp := time.Now().Add(5 * time.Minute)
	exp1 := time.Now()
	cases := []struct {
		desc    string
		key     auth.Key
		expired bool
	}{
		{
			desc: "not expired key",
			key: auth.Key{
				IssuedAt:  time.Now(),
				ExpiresAt: exp,
			},
			expired: false,
		},
		{
			desc: "expired key",
			key: auth.Key{
				IssuedAt:  time.Now().UTC().Add(2 * time.Minute),
				ExpiresAt: exp1,
			},
			expired: true,
		},
		{
			desc: "user key with no expiration date",
			key: auth.
    
func TestExpired(t *testing.T) {
	exp := time.Now().Add(5 * time.Minute)
	exp1 := time.Now()
	cases := []struct {
		desc    string
		key     auth.Key
		expired bool
	}{
		{
			desc: "not expired key",
			key: auth.Key{
				IssuedAt:  time.Now(),
				ExpiresAt: exp,
			},
			expired: false,
		},
		{
			desc: "expired key",
			key: auth.Key{
				IssuedAt:  time.Now().UTC().Add(2 * time.Minute),
				ExpiresAt: exp1,
			},
			expired: true,
		},
		{
			desc: "user key with no expiration date",
			key: auth.Key{
				IssuedAt: time.Now(),
			},
			expired: true,
		},
		{
			desc: "API key with no expiration date",
			key: auth.Key{
				IssuedAt: time.Now(),
				Type:     auth.APIKey,
			},
			expired: false,
		},
	}

	for _, tc := range cases {
		res := tc.key.Expired()
		assert.Equal(t, tc.expired, res, fmt.Sprintf("%s: expected %t got %t\n", tc.desc, tc.expired, res))
	}
}