package main

import (
	"io/ioutil"
	"os"
	"strings"
	"testing"
	"time"
)

func TestTickPrinter(t *testing.T) {
	defer testOut(t)()
	name := os.Stdout.Name()

	tp := NewTickPrinter(time.Millisecond * 250)
	go tp.Start()
	time.Sleep(time.Millisecond * 300)
	tp.Stop()
	b, err := ioutil.ReadFile(name)
	if err != nil {
		t.Fatal(err)
	}
	ts, err := time.Parse("15:04:05", strings.TrimSpace(string(b)))
	if err != nil {
		t.Fatal(err)
	}
	if (time.Now().Minute()*60+time.Now().Hour())-(ts.Minute()*60+ts.Hour()) > 1 {
		t.Fatal(ts)
	}
}

func testOut(t *testing.T) func() {
	wasOut := os.Stdout

	var err error
	if os.Stdout, err = ioutil.TempFile(os.TempDir(), "testOut*"); err != nil {
		t.Fatal(err)
	}

	return func() {
		os.Stdout = wasOut
	}
}