test/chan/chan_test.go

package chan_test

import (
	"fmt"
	"testing"
)

func TestClose(t *testing.T) {
	ch := make(chan int)

	close(ch)

	<-ch
	<-ch
	<-ch

	println("ok")
}

type Tuple[K comparable, V any] struct {
	K K
	V V
}

func TestWalk(t *testing.T) {
	tch := make(chan *Tuple[int, string], 100)
	go func() {
		for n := 1; n < 10000; n++ {
			s := fmt.Sprint("V", n)
			tch <- &Tuple[int, string]{n, s}
		}
		close(tch)
	}()
	for a := range tch {
		println(a.K, a.V)
	}
}