2 files changed, 93 insertions, 1 deletions
diff --git a/tun/helper_test.go b/tun/helper_test.go
new file mode 100644
index 0000000..3e86fc8
--- /dev/null
+++ b/tun/helper_test.go
@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package tun
+
+import (
+	"bytes"
+	"errors"
+	"golang.zx2c4.com/wireguard/tun"
+	"os"
+	"testing"
+)
+
+/* Helpers for writing unit tests
+ */
+
+type DummyTUN struct {
+	name    string
+	mtu     int
+	packets chan []byte
+	events  chan tun.TUNEvent
+}
+
+func (tun *DummyTUN) File() *os.File {
+	return nil
+}
+
+func (tun *DummyTUN) Name() (string, error) {
+	return tun.name, nil
+}
+
+func (tun *DummyTUN) MTU() (int, error) {
+	return tun.mtu, nil
+}
+
+func (tun *DummyTUN) Write(d []byte, offset int) (int, error) {
+	tun.packets <- d[offset:]
+	return len(d), nil
+}
+
+func (tun *DummyTUN) Close() error {
+	close(tun.events)
+	close(tun.packets)
+	return nil
+}
+
+func (tun *DummyTUN) Events() chan tun.TUNEvent {
+	return tun.events
+}
+
+func (tun *DummyTUN) Read(d []byte, offset int) (int, error) {
+	t, ok := <-tun.packets
+	if !ok {
+		return 0, errors.New("device closed")
+	}
+	copy(d[offset:], t)
+	return len(t), nil
+}
+
+func CreateDummyTUN(name string) (tun.TUNDevice, error) {
+	var dummy DummyTUN
+	dummy.mtu = 0
+	dummy.packets = make(chan []byte, 100)
+	dummy.events = make(chan tun.TUNEvent, 10)
+	return &dummy, nil
+}
+
+func assertNil(t *testing.T, err error) {
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func assertEqual(t *testing.T, a []byte, b []byte) {
+	if bytes.Compare(a, b) != 0 {
+		t.Fatal(a, "!=", b)
+	}
+}
+
+func randDevice(t *testing.T) *Device {
+	sk, err := newPrivateKey()
+	if err != nil {
+		t.Fatal(err)
+	}
+	tun, _ := CreateDummyTUN("dummy")
+	logger := NewLogger(LogLevelError, "")
+	device := NewDevice(tun, logger)
+	device.SetPrivateKey(sk)
+	return device
+}
diff --git a/tun/tun_windows.go b/tun/tun_windows.go
index 94efe48..d767d79 100644
--- a/tun/tun_windows.go
+++ b/tun/tun_windows.go
@@ -353,4 +353,4 @@ func (tun *NativeTun) Write(buff []byte, offset int) (int, error) {
 
 func (tun *NativeTun) GUID() windows.GUID {
 	return *(*windows.GUID)(tun.wt)
-}
-\ No newline at end of file
+}