Add /proc/sys/net/ipv4/ip_forward

1 files changed, 50 insertions, 0 deletions

diff --git a/pkg/tcpip/buffer/prependable_test.go b/pkg/tcpip/buffer/prependable_test.go
new file mode 100644
index 000000000..43660c307
--- /dev/null
+++ b/pkg/tcpip/buffer/prependable_test.go
@@ -0,0 +1,50 @@
+// Copyright 2019 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package buffer
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestNewPrependableFromView(t *testing.T) {
+	tests := []struct {
+		comment   string
+		view      View
+		extraSize int
+		want      Prependable
+	}{
+		{
+			comment:   "Reserve extra space",
+			view:      View("abc"),
+			extraSize: 2,
+			want:      Prependable{buf: View("\x00\x00abc"), usedIdx: 2},
+		},
+		{
+			comment:   "Don't reserve extra space",
+			view:      View("abc"),
+			extraSize: 0,
+			want:      Prependable{buf: View("abc"), usedIdx: 0},
+		},
+	}
+
+	for _, testCase := range tests {
+		t.Run(testCase.comment, func(t *testing.T) {
+			prep := NewPrependableFromView(testCase.view, testCase.extraSize)
+			if !reflect.DeepEqual(prep, testCase.want) {
+				t.Errorf("NewPrependableFromView(%#v, %d) = %#v; want %#v", testCase.view, testCase.extraSize, prep, testCase.want)
+			}
+		} )
+	}
+}