test/file/file_test.go

package file_test

import (
	"fmt"
	"os"
	"strings"
	"testing"
	"time"
)

func TestBuffer(m *testing.T) {
	fn := "test.txt"
	f, e := os.OpenFile(fn, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0777)
	if e != nil {
		fmt.Println(e)
		return
	}
	f.Truncate(0)
	for i := 0; i < 1000; i++ {
		f.Write([]byte(strings.Repeat("+", 1)))
		// cmd := exec.Command("/bin/bash", "-c", "ls -l "+fn)
		// cmd.Stderr = os.Stderr
		// cmd.Stdout = os.Stdout
		// cmd.Stdin = os.Stdin
		// cmd.Run()
		time.Sleep(1 * time.Second)
	}
}