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: communicator_test.go
    path of file: ./repos/terraform/internal/communicator/ssh
    
    the code of the file until where you have to start completion: // Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1

//go:build !race
// +build !race

package ssh

import (
	"bufio"
	"bytes"
	"encoding/base64"
	"fmt"
	"io"
	"io/ioutil"
	"math/rand"
	"net"
	"os"
	"path/filepath"
	"regexp"
	"strconv"
	"strings"
	"testing"
	"time"

	"github.com/hashicorp/terraform/internal/communicator/remote"
	"github.com/zclconf/go-cty/cty"
	"golang.org/x/crypto/ssh"
)

// private key for mock server
const testServerPrivateKey = `-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA19lGVsTqIT5iiNYRgnoY1CwkbETW5cq+Rzk5v/kTlf31XpSU
70HVWkbTERECjaYdXM2gGcbb+sxpq6GtXf1M3kVomycqhxwh
    
func TestLostConnection(t *testing.T) {
	address := newMockLineServer(t, nil, testClientPublicKey)
	parts := strings.Split(address, ":")

	v := cty.ObjectVal(map[string]cty.Value{
		"type":     cty.StringVal("ssh"),
		"user":     cty.StringVal("user"),
		"password": cty.StringVal("pass"),
		"host":     cty.StringVal(parts[0]),
		"port":     cty.StringVal(parts[1]),
		"timeout":  cty.StringVal("30s"),
	})

	c, err := New(v)
	if err != nil {
		t.Fatalf("error creating communicator: %s", err)
	}

	var cmd remote.Cmd
	stdout := new(bytes.Buffer)
	cmd.Command = "echo foo"
	cmd.Stdout = stdout

	err = c.Start(&cmd)
	if err != nil {
		t.Fatalf("error executing remote command: %s", err)
	}

	// The test server can't execute anything, so Wait will block, unless
	// there's an error.  Disconnect the communicator transport, to cause the
	// command to fail.
	go func() {
		time.Sleep(100 * time.Millisecond)
		c.Disconnect()
	}()

	err = cmd.Wait()
	if err == nil {
		t.Fatal("expected communicator error")
	}
}