add test to newInvader

package spaceinvaders

import (

	"crypto/md5"

	"fmt"

	"io"

	"testing"

)

var (

	key string

)

func init() {

	h := md5.New()

	io.WriteString(h, "hello")

	key = fmt.Sprintf("%x", h.Sum(nil)[:])

}

func TestnewInvader(t *testing.T) {

	invs := []invader{newInvader(key), newInvader(key)}

	for _, inv := range invs {

		if inv.legs != 4 {

			t.Errorf("expected %d got %d", 4, inv.legs)

		}

		if inv.foot != false {

			t.Errorf("expected %v got %v", false, inv.legs)

		}

		if inv.arms != 2 {

			t.Errorf("expected %v got %v", 2, inv.arms)

		}

		if inv.anthenas != 0 {

			t.Errorf("expected %v got %v", 0, inv.anthenas)

		}

		if inv.length != 10 {

			t.Errorf("expected %v got %v", 10, inv.length)

		}

		if inv.height != 9 {

			t.Errorf("expected %v got %v", 9, inv.height)

		}

		if inv.eyes != 3 {

			t.Errorf("expected %v got %v", 3, inv.eyes)

		}

		if inv.armsUp != true {

			t.Errorf("expected %v got %v", true, inv.armsUp)

		}

		if inv.armSize != 3 {

			t.Errorf("expected %v got %v", 3, inv.armSize)

		}

		if inv.anthenaSize != 0 {

			t.Errorf("expected %v got %v", 0, inv.anthenaSize)

		}

	}

}