我用Go编写了一个SSH客户端,我想编写一些测试。问题在于,我从来没有真正地编写过适当的单元测试,大多数教程似乎都集中在为添加两个数字或其他玩具问题编写测试函数。我已经了解了有关模拟、使用接口和其他技术的知识,但我在应用它们时遇到了困难。此外,我的客户端将同时被使用,以允许对多个设备进行快速配置。不确定这是否会改变我编写测试的方式或是否需要添加额外的测试。感谢任何帮助。
以下是我的代码。基本上,一个设备有4个主要功能:
以下是我的代码。基本上,一个设备有4个主要功能:
Connect
连接设备,Send
发送配置命令,Output
/Err
捕获会话的输出,和Close
关闭客户端。package device
import (
"bufio"
"fmt"
"golang.org/x/crypto/ssh"
"io"
"net"
"time"
)
// A Device represents a remote network device.
type Device struct {
Host string // the device's hostname or IP address
client *ssh.Client // the client connection
session *ssh.Session // the connection to the remote shell
stdin io.WriteCloser // the remote shell's standard input
stdout io.Reader // the remote shell's standard output
stderr io.Reader // the remote shell's standard error
}
// Connect establishes an SSH connection to a device and sets up the session IO.
func (d *Device) Connect(user, password string) error {
// Create a client connection
client, err := ssh.Dial("tcp", net.JoinHostPort(d.Host, "22"), configureClient(user, password))
if err != nil {
return err
}
d.client = client
// Create a session
session, err := client.NewSession()
if err != nil {
return err
}
d.session = session
return nil
}
// configureClient sets up the client configuration for login
func configureClient(user, password string) *ssh.ClientConfig {
var sshConfig ssh.Config
sshConfig.SetDefaults()
sshConfig.Ciphers = append(sshConfig.Ciphers, "aes128-cbc", "aes256-cbc", "3des-cbc", "des-cbc", "aes192-cbc")
config := &ssh.ClientConfig{
Config: sshConfig,
User: user,
Auth: []ssh.AuthMethod{ssh.Password(password)},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
Timeout: time.Second * 5,
}
return config
}
// setupIO creates the pipes connected to the remote shell's standard input, output, and error
func (d *Device) setupIO() error {
// Setup standard input pipe
stdin, err := d.session.StdinPipe()
if err != nil {
return err
}
d.stdin = stdin
// Setup standard output pipe
stdout, err := d.session.StdoutPipe()
if err != nil {
return err
}
d.stdout = stdout
// Setup standard error pipe
stderr, err := d.session.StderrPipe()
if err != nil {
return err
}
d.stderr = stderr
return nil
}
// Send sends cmd(s) to the device's standard input. A device only accepts one call
// to Send, as it closes the session and its standard input pipe.
func (d *Device) Send(cmds ...string) error {
if d.session == nil {
return fmt.Errorf("device: session is closed")
}
defer d.session.Close()
// Start the shell
if err := d.startShell(); err != nil {
return err
}
// Send commands
for _, cmd := range cmds {
if _, err := d.stdin.Write([]byte(cmd + "\r")); err != nil {
return err
}
}
defer d.stdin.Close()
// Wait for the commands to exit
d.session.Wait()
return nil
}
// startShell requests a pseudo terminal (VT100) and starts the remote shell.
func (d *Device) startShell() error {
modes := ssh.TerminalModes{
ssh.ECHO: 0, // disable echoing
ssh.OCRNL: 0,
ssh.TTY_OP_ISPEED: 14400,
ssh.TTY_OP_OSPEED: 14400,
}
err := d.session.RequestPty("vt100", 0, 0, modes)
if err != nil {
return err
}
if err := d.session.Shell(); err != nil {
return err
}
return nil
}
// Output returns the remote device's standard output output.
func (d *Device) Output() ([]string, error) {
return readPipe(d.stdout)
}
// Err returns the remote device's standard error output.
func (d *Device) Err() ([]string, error) {
return readPipe(d.stdout)
}
// reapPipe reads an io.Reader line by line
func readPipe(r io.Reader) ([]string, error) {
var lines []string
scanner := bufio.NewScanner(r)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
if err := scanner.Err(); err != nil {
return nil, err
}
return lines, nil
}
// Close closes the client connection.
func (d *Device) Close() error {
return d.client.Close()
}
// String returns the string representation of a `Device`.
func (d *Device) String() string {
return fmt.Sprintf("%s", d.Host)
}