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package units

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

func ExampleHumanDuration() {
	fmt.Println(HumanDuration(450 * time.Millisecond))
	fmt.Println(HumanDuration(47 * time.Second))
	fmt.Println(HumanDuration(1 * time.Minute))
	fmt.Println(HumanDuration(3 * time.Minute))
	fmt.Println(HumanDuration(35 * time.Minute))
	fmt.Println(HumanDuration(35*time.Minute + 40*time.Second))
	fmt.Println(HumanDuration(1 * time.Hour))
	fmt.Println(HumanDuration(1*time.Hour + 45*time.Minute))
	fmt.Println(HumanDuration(3 * time.Hour))
	fmt.Println(HumanDuration(3*time.Hour + 59*time.Minute))
	fmt.Println(HumanDuration(3*time.Hour + 60*time.Minute))
	fmt.Println(HumanDuration(24 * time.Hour))
	fmt.Println(HumanDuration(24*time.Hour + 12*time.Hour))
	fmt.Println(HumanDuration(2 * 24 * time.Hour))
	fmt.Println(HumanDuration(7 * 24 * time.Hour))
	fmt.Println(HumanDuration(13*24*time.Hour + 5*time.Hour))
	fmt.Println(HumanDuration(2 * 7 * 24 * time.Hour))
	fmt.Println(HumanDuration(2*7*24*time.Hour + 4*24*time.Hour))
	fmt.Println(HumanDuration(3 * 7 * 24 * time.Hour))
	fmt.Println(HumanDuration(4 * 7 * 24 * time.Hour))
	fmt.Println(HumanDuration(4*7*24*time.Hour + 3*24*time.Hour))
	fmt.Println(HumanDuration(1 * 30 * 24 * time.Hour))
	fmt.Println(HumanDuration(1*30*24*time.Hour + 2*7*24*time.Hour))
	fmt.Println(HumanDuration(2 * 30 * 24 * time.Hour))
	fmt.Println(HumanDuration(3*30*24*time.Hour + 1*7*24*time.Hour))
	fmt.Println(HumanDuration(5*30*24*time.Hour + 2*7*24*time.Hour))
	fmt.Println(HumanDuration(13 * 30 * 24 * time.Hour))
	fmt.Println(HumanDuration(23 * 30 * 24 * time.Hour))
	fmt.Println(HumanDuration(24 * 30 * 24 * time.Hour))
	fmt.Println(HumanDuration(24*30*24*time.Hour + 2*7*24*time.Hour))
	fmt.Println(HumanDuration(3*365*24*time.Hour + 2*30*24*time.Hour))
}

func TestHumanDuration(t *testing.T) {
	// Useful duration abstractions
	day := 24 * time.Hour
	week := 7 * day
	month := 30 * day
	year := 365 * day

	assertEquals(t, "Less than a second", HumanDuration(450*time.Millisecond))
	assertEquals(t, "1 second", HumanDuration(1*time.Second))
	assertEquals(t, "45 seconds", HumanDuration(45*time.Second))
	assertEquals(t, "46 seconds", HumanDuration(46*time.Second))
	assertEquals(t, "59 seconds", HumanDuration(59*time.Second))
	assertEquals(t, "About a minute", HumanDuration(60*time.Second))
	assertEquals(t, "About a minute", HumanDuration(1*time.Minute))
	assertEquals(t, "3 minutes", HumanDuration(3*time.Minute))
	assertEquals(t, "35 minutes", HumanDuration(35*time.Minute))
	assertEquals(t, "35 minutes", HumanDuration(35*time.Minute+40*time.Second))
	assertEquals(t, "45 minutes", HumanDuration(45*time.Minute))
	assertEquals(t, "45 minutes", HumanDuration(45*time.Minute+40*time.Second))
	assertEquals(t, "46 minutes", HumanDuration(46*time.Minute))
	assertEquals(t, "59 minutes", HumanDuration(59*time.Minute))
	assertEquals(t, "About an hour", HumanDuration(1*time.Hour))
	assertEquals(t, "About an hour", HumanDuration(1*time.Hour+29*time.Minute))
	assertEquals(t, "2 hours", HumanDuration(1*time.Hour+31*time.Minute))
	assertEquals(t, "2 hours", HumanDuration(1*time.Hour+59*time.Minute))
	assertEquals(t, "3 hours", HumanDuration(3*time.Hour))
	assertEquals(t, "3 hours", HumanDuration(3*time.Hour+29*time.Minute))
	assertEquals(t, "4 hours", HumanDuration(3*time.Hour+31*time.Minute))
	assertEquals(t, "4 hours", HumanDuration(3*time.Hour+59*time.Minute))
	assertEquals(t, "4 hours", HumanDuration(3*time.Hour+60*time.Minute))
	assertEquals(t, "24 hours", HumanDuration(24*time.Hour))
	assertEquals(t, "36 hours", HumanDuration(1*day+12*time.Hour))
	assertEquals(t, "2 days", HumanDuration(2*day))
	assertEquals(t, "7 days", HumanDuration(7*day))
	assertEquals(t, "13 days", HumanDuration(13*day+5*time.Hour))
	assertEquals(t, "2 weeks", HumanDuration(2*week))
	assertEquals(t, "2 weeks", HumanDuration(2*week+4*day))
	assertEquals(t, "3 weeks", HumanDuration(3*week))
	assertEquals(t, "4 weeks", HumanDuration(4*week))
	assertEquals(t, "4 weeks", HumanDuration(4*week+3*day))
	assertEquals(t, "4 weeks", HumanDuration(1*month))
	assertEquals(t, "6 weeks", HumanDuration(1*month+2*week))
	assertEquals(t, "2 months", HumanDuration(2*month))
	assertEquals(t, "2 months", HumanDuration(2*month+2*week))
	assertEquals(t, "3 months", HumanDuration(3*month))
	assertEquals(t, "3 months", HumanDuration(3*month+1*week))
	assertEquals(t, "5 months", HumanDuration(5*month+2*week))
	assertEquals(t, "13 months", HumanDuration(13*month))
	assertEquals(t, "23 months", HumanDuration(23*month))
	assertEquals(t, "24 months", HumanDuration(24*month))
	assertEquals(t, "2 years", HumanDuration(24*month+2*week))
	assertEquals(t, "3 years", HumanDuration(3*year+2*month))
}