| // 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" |
| |
| "github.com/google/netstack/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) |
| } |
| } |