test/timer/timer_test.go

package timer_test

import (
	"fmt"
	"testing"
	"time"
)

func TestTimer(t *testing.T) {
	ch := make(chan interface{}, 1)
	ch <- time.Now()
	for {
		select {
		case <-ch:
			fmt.Println(time.Now())
			time.AfterFunc(1*time.Second, func() {
				ch <- time.Now()
			})
		}
	}
}