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// Copyright 2016 The Netstack Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package header_test
import (
"testing"
"gvisor.googlesource.com/gvisor/pkg/tcpip/header"
)
func TestIPv4(t *testing.T) {
b := header.IPv4(make([]byte, header.IPv4MinimumSize))
b.Encode(&header.IPv4Fields{})
const want = header.IPv4Version
if v := header.IPVersion(b); v != want {
t.Fatalf("Bad version, want %v, got %v", want, v)
}
}
func TestIPv6(t *testing.T) {
b := header.IPv6(make([]byte, header.IPv6MinimumSize))
b.Encode(&header.IPv6Fields{})
const want = header.IPv6Version
if v := header.IPVersion(b); v != want {
t.Fatalf("Bad version, want %v, got %v", want, v)
}
}
func TestOtherVersion(t *testing.T) {
const want = header.IPv4Version + header.IPv6Version
b := make([]byte, 1)
b[0] = want << 4
if v := header.IPVersion(b); v != want {
t.Fatalf("Bad version, want %v, got %v", want, v)
}
}
func TestTooShort(t *testing.T) {
b := make([]byte, 1)
b[0] = (header.IPv4Version + header.IPv6Version) << 4
// Get the version of a zero-length slice.
const want = -1
if v := header.IPVersion(b[:0]); v != want {
t.Fatalf("Bad version, want %v, got %v", want, v)
}
// Get the version of a nil slice.
if v := header.IPVersion(nil); v != want {
t.Fatalf("Bad version, want %v, got %v", want, v)
}
}
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