go defer 使用

2022-07-09
浏览 (1206)

golang defer 使用样例

package main

import (
	"fmt"
	"gotest/common"
	"testing"
	"time"
)

// test 测试函数
func TestDefer(t *testing.T) {
	common.Println("hi, main thread")
	defer fmt.Println(`exiting now`)
	go fmt.Println("hi, sub one thead")
	go fmt.Println("hi sub two thread")
	fmt.Println("end")
	return
}

// -bench 基准测试
func BenchmarkSum(b *testing.B) {
	sum := 0
	for i := 0; i < b.N; i++ {
		sum += i
	}
}

// -timeout 测试
func TestSumLongTime(t *testing.T) {
	time.Sleep(time.Second * 2)
	fmt.Println("testTime")
}

// -example 测试
func ExamplePrintln() {
	Println()
	//Output: this is an example.
}

func Println() {
	fmt.Println("this is an example.")
}