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: chromedp_test.go
    path of file: ./repos/chromedp
    
    the code of the file until where you have to start completion: package chromedp

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"image/color"
	"image/png"
	"io"
	"log"
	"net"
	"net/http"
	"net/http/httptest"
	"os"
	"path"
	"path/filepath"
	"strings"
	"sync"
	"sync/atomic"
	"testing"
	"text/template"
	"time"

	"github.com/chromedp/cdproto/browser"
	"github.com/chromedp/cdproto/cdp"
	"github.com/chromedp/cdproto/dom"
	"github.com/chromedp/
    
func TestListenTarget(t *testing.T) {
	t.Parallel()

	ctx, cancel := testAllocate(t, "")
	defer cancel()

	// Check that many listen callbacks work, including adding callbacks
	// after the target has been attached to.
	var navigatedCount, updatedCount int
	ListenTarget(ctx, func(ev interface{}) {
		if _, ok := ev.(*page.EventFrameNavigated); ok {
			navigatedCount++
		}
	})
	if err := Run(ctx); err != nil {
		t.Fatal(err)
	}
	ListenTarget(ctx, func(ev interface{}) {
		if _, ok := ev.(*dom.EventDocumentUpdated); ok {
			updatedCount++
		}
	})

	if err := Run(ctx, Navigate(testdataDir+"/form.html")); err != nil {
		t.Fatal(err)
	}
	cancel()
	if want := 1; navigatedCount != want {
		t.Fatalf("want %d Page.frameNavigated events; got %d", want, navigatedCount)
	}
	if want := 1; updatedCount < want {
		t.Fatalf("want at least %d DOM.documentUpdated events; got %d", want, updatedCount)
	}
}