expect 做 telnet shell 脚本测试

需求背景

用 golang 写了个 tcp 数据上报服务，用来接收硬件设备上的传感器实时数据。 但是测试起来很麻烦，每次增加协议功能，都需要手动重复 telnet 并输入指令，费时费力，且容易忘记指令。

测试技术选型

• 用 go 写这种自动测试，我能想到的就是新建一个 main package，这样会多出一个目录，感觉麻烦
• python 涉及到版本依赖，越来越不喜欢
• 感觉还是直接用 shell 写更简单方便，且直观

expect

还是用 expect 更合理一些，因为要判断 tcp 的返回数据格式，是否跟协议规定的一致。

Expect is a program that "talks" to other interactive programs according to a script. Following the script, Expect knows what can be expected from a program and what the correct response should be.

Ubuntu 上安装 expect

sudo apt install expect

测试脚本

#!/usr/bin/expect

# If it all goes pear shaped the script will timeout after 20 seconds.
set timeout 20

# This spawns the telnet program and connects it
spawn telnet 127.0.0.1 9999
sleep 3

send "name: 123456"
send "\r"
expect "name_ok"
sleep 1

# 心跳包
send "hb"
send "\r"
expect "hb_ok"
sleep 1

# 传感器数据
send "data: 1,2,3,4,5,6,7,8,9"
send "\r"
expect "data_ok"
sleep 1

# This hands control of the keyboard over to you (Nice expect feature!)
interact

执行

chmod +x test.expect
./test.expect

参考

https://stackoverflow.com/questions/7013137/automating-telnet-session-using-bash-scripts

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