package dhcpv4

import (
	"net"
	"testing"

	"github.com/stretchr/testify/require"
)

func TestOptSubnetMaskInterfaceMethods(t *testing.T) {
	mask := net.IPMask{255, 255, 255, 0}
	o := OptSubnetMask{SubnetMask: mask}

	require.Equal(t, OptionSubnetMask, o.Code(), "Code")

	expectedBytes := []byte{255, 255, 255, 0}
	require.Equal(t, expectedBytes, o.ToBytes(), "ToBytes")

	require.Equal(t, "Subnet Mask -> ffffff00", o.String(), "String")
}

func TestParseOptSubnetMask(t *testing.T) {
	var (
		o   *OptSubnetMask
		err error
	)
	o, err = ParseOptSubnetMask([]byte{})
	require.Error(t, err, "empty byte stream")

	o, err = ParseOptSubnetMask([]byte{255})
	require.Error(t, err, "short byte stream")

	o, err = ParseOptSubnetMask([]byte{255, 255, 255, 0})
	require.NoError(t, err)
	require.Equal(t, net.IPMask{255, 255, 255, 0}, o.SubnetMask)
}