package usync

import "time"
import "testing"
import "context"

func TestSelect (test *testing.T) {
	// https://stackoverflow.com/questions/19992334
	c1 := make(chan int)
	c2 := make(chan int)
	c3 := make(chan int)
	chs := []chan int { c1, c2, c3 }
	go func () {
		time.Sleep(time.Second)
		c2 <- 42
	} ()
	ctx, done := context.WithTimeout(context.Background(), 5 * time.Second)
	defer done()

	chosen, val, ok := Select(ctx, chs...)
	if !ok          { test.Fatal("not ok")                  }
	if 1  != chosen { test.Fatal("expected 1, got", chosen) }
	if 42 != val    { test.Fatal("expected 42, got", val)   }
}