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: recording_test.go
    path of file: ./repos/azure-sdk-for-go/sdk/internal/recording
    
    the code of the file until where you have to start completion: //go:build go1.18
// +build go1.18

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

package recording

import (
	"encoding/json"
	"fmt"
	"io"
	"math/rand"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"github.com/Azure/azure-sdk-for-go/sdk/internal/mock"
	"github.com/dnaeon/go-vcr/cassette"
	"github.com/stretchr/testify/require"
	"github.com/stretchr/testify/suite"
)

const packagePath = "sdk/internal/recording/testdata"

type recordingTests struct {
	suite.Suite
	proxy *TestProxyInstance
}

func TestRecording(t *testing.T) {
	suite.Run(t, new(recordingTests))
}

func (s *recordingTests) SetupSuite() {
	// Ignore manual start in pipelin
    
func (s *recordingTests) TestGenerateAlphaNumericID() {
	require := require.New(s.T())
	recordMode = RecordingMode
	err := Start(s.T(), packagePath, nil)
	require.NoError(err)
	rand1, err := GenerateAlphaNumericID(s.T(), "test", 10, false)
	require.NoError(err)
	rand2, err := GenerateAlphaNumericID(s.T(), "test", 10, false)
	require.NoError(err)
	require.NotEqual(rand1, rand2)
	err = Stop(s.T(), nil)
	require.NoError(err)
	recordMode = PlaybackMode
	err = Start(s.T(), packagePath, nil)
	require.NoError(err)
	rand3, err := GenerateAlphaNumericID(s.T(), "test", 10, false)
	require.NoError(err)
	rand4, err := GenerateAlphaNumericID(s.T(), "test", 10, false)
	require.NoError(err)
	require.Equal(rand1, rand3)
	require.Equal(rand2, rand4)
	err = Stop(s.T(), nil)
	require.NoError(err)
}