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: driver_audio_test.go
    path of file: ./repos/base64Captcha
    
    the code of the file until where you have to start completion: // Copyright 2017 Eric Zhou. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package base64Captcha

import (
	"reflect"
	"testing"
)

func TestDriverAudio_DrawCaptcha(t *testing.T) {
    
func TestDriverAudio_DrawCaptcha(t *testing.T) {
	type fields struct {
		CaptchaLen int
		Language   string
	}
	type args struct {
		content string
	}
	tests := []struct {
		name     string
		fields   fields
		args     args
		wantItem Item
		wantErr  bool
	}{
		{"Audio", fields{4, "zh"}, args{"1234"}, nil, false},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			d := &DriverAudio{
				Length:   tt.fields.CaptchaLen,
				Language: tt.fields.Language,
			}
			gotItem, err := d.DrawCaptcha(tt.args.content)
			if err != nil {
				t.Error(err)
			}
			itemWriteFile(gotItem, "_builds", tt.args.content, "wav")
		})
	}
}