package tlv

import (
	"testing"
)

func TestRouterIDFailZeros(t *testing.T) {
	zeros := [10]byte{}
	if _, _, err := RouterIDFromBytes(zeros[:]); err != ErrRouterIDZeros {
		t.Error("RouterIDFromBytes should fail with ErrRouterIDZeros")
	}
}

func TestRouterIDFailOnes(t *testing.T) {
	ones := [10]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
	if _, _, err := RouterIDFromBytes(ones[:]); err != ErrRouterIDOnes {
		t.Error("RouterIDFromBytes should fail with ErrRouterIDOnes")
	}
}

func TestRouterIDFailLength(t *testing.T) {
	testbytes := [300]byte{}
	for i := 0; i <= len(testbytes); i++ {
		_, _, err := RouterIDFromBytes(testbytes[:i])
		l, isErrRouterIDLength := err.(ErrTLVLength)

		switch {
		case i >= 10:
			if isErrRouterIDLength {
				t.Error("RouterIDFromBytes returns ErrRouterIDLength for correct length data")
			}
		default:
			if l.l != i {
				t.Errorf("RouterIDFromBytes returns wrong length %d, expected %d", l, i)
			}
			if !isErrRouterIDLength {
				t.Errorf("RouterIDFromBytes returns wrong error for packet of wrong length %d", i)
			}
		}
	}
}