golang-examples/example-test/ex_test.go

package ex

import "sync"
import "testing"

type Item struct{}

func TestAppend(t *testing.T) {
	var list []Item

	n := 2
	wg := sync.WaitGroup{}
	wg.Add(n)
	for i := 0; i < n; i++ {
		go func() {
			defer wg.Done()
			list = append(list, Item{})
		}()
	}
	wg.Wait()
}