starting delivery instruction testing

lib/tunnel/delivery_test.go

@@ -0,0 +1,56 @@
+package tunnel
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+type DeliveryInstructionsFlags struct {
+	FirstFragment bool
+	Type          byte
+	Delay         bool
+}
+
+func (dif DeliveryInstructionsFlags) FlagByte() byte {
+	flag := byte(0x00)
+	if !dif.FirstFragment {
+		flag |= 0x01
+	}
+	flag |= dif.Type
+	if dif.Delay {
+		flag |= 0x10
+	}
+	return byte(flag)
+}
+
+func validFirstFragmentDeliveryInstructions() []byte {
+	data := []byte{}
+
+	flag := DeliveryInstructionsFlags{
+		FirstFragment: true,
+		Type:          0x02,
+		Delay:         false,
+	}.FlagByte()
+	data = append(data, flag)
+
+	tunnel_id := []byte{0x00, 0x00, 0x00, 0x01}
+	data = append(data, tunnel_id...)
+
+	hash := make([]byte, 32)
+	data = append(data, hash...)
+
+	// Add 0 delay
+	data = append(data, 0)
+
+	message_id := []byte{0x00, 0x00, 0x00, 0x02}
+	data = append(data, message_id...)
+
+	return data
+}
+
+func TestReadDeliveryInstructions(t *testing.T) {
+	assert := assert.New(t)
+
+	_, _, err := readDeliveryInstructions(validFirstFragmentDeliveryInstructions())
+	assert.Nil(err)
+}