一，安装用到的库
1,gomonkey代码的地址:

https://github.com/agiledragon/gomonkey

2，从命令行安装gomonkey

go get -u github.com/agiledragon/gomonkey
3,goconvey库的代码地址

https://github.com/smartystreets/goconvey

4,从命令行安装

go get -u github.com/smartystreets/goconvey

二，演示项目的相关信息
功能说明：演示了使用gomonkey库在项目中测试时打桩

三，go代码说明
1，model/user.go

package model

type MyUser struct {
name string
}

//返回用户的name
func (s *MyUser) GetUserName() string {
return s.name
}
2，main.go

package main

//定义一个加法方法
func Add(a, b int) int {
return a + b
}

//定义方法，返回一个整数的2倍
func GetDouble(a int) int {
return Add(a,a)
}
3，main_test.go

package main

import (
. "github.com/agiledragon/gomonkey"
"github.com/liuhongdi/unittest03/model"
. "github.com/smartystreets/goconvey/convey"
"reflect"
"testing"
)



//测试double,为add函数打桩1
func TestDoubleRight(t *testing.T) {
patch := ApplyFunc(Add, func(a,b int) int {
return a * 2
})
defer patch.Reset()
//fmt.Println(GetDouble(2))
Convey("test 2 x 2", t, func() {
So(GetDouble(2), ShouldEqual,4)
})
}

//add函数的桩子
func addstub(a,b int) int {
return a*3
}

//测试double,为add函数打桩2
func TestDoubleError(t *testing.T) {
patch := ApplyFunc(Add, addstub)
defer patch.Reset()
//fmt.Println(GetDouble(2))
Convey("test 2 x 2", t, func() {
So(GetDouble(2), ShouldEqual,4)
})
}

//测试给方法打桩1,返回正确
func TestMethodRight(t *testing.T) {
var temp *model.MyUser
patch := ApplyMethod(reflect.TypeOf(temp), "GetUserName", func(_ *model.MyUser) string {
return "hello,world!"
})
defer patch.Reset()
Convey("GetUserName将返回:hello,world!", t, func() {
var user *model.MyUser
user = new(model.MyUser)
So(user.GetUserName(), ShouldEqual, "hello,world!")
})
}

//测试给方法打桩2,返回错误
func TestMethodError(t *testing.T) {
var temp *model.MyUser
patch := ApplyMethod(reflect.TypeOf(temp), "GetUserName", func(_ *model.MyUser) string {
return "hello,老刘!"
})
defer patch.Reset()
Convey("GetUserName将返回:hello,world!", t, func() {
var user *model.MyUser
user = new(model.MyUser)
So(user.GetUserName(), ShouldEqual, "hello,world!")
})
}
四，测试效果
执行测试:

root@ku:/data/go/unittest03# go test -v ./... -gcflags "all=-N -l"
注意:添加参数:-gcflags "all=-N -l"

否则打桩可能不会生效

返回: