1 files changed, 63 insertions, 0 deletions
diff --git a/codec/msg_codec_test.go b/codec/msg_codec_test.go
new file mode 100644
index 0000000..cd1240e
--- /dev/null
+++ b/codec/msg_codec_test.go
@@ -0,0 +1,63 @@
+package codec
+
+import (
+	"bytes"
+	"testing"
+
+	"git.fd.io/govpp.git/api"
+)
+
+type MyMsg struct {
+	Index uint16
+	Label []byte `struc:"[16]byte"`
+	Port  uint16
+}
+
+func (*MyMsg) GetMessageName() string {
+	return "my_msg"
+}
+func (*MyMsg) GetCrcString() string {
+	return "xxxxx"
+}
+func (*MyMsg) GetMessageType() api.MessageType {
+	return api.OtherMessage
+}
+
+func TestEncode(t *testing.T) {
+	tests := []struct {
+		name    string
+		msg     api.Message
+		msgID   uint16
+		expData []byte
+	}{
+		{name: "basic",
+			msg:     &MyMsg{Index: 1, Label: []byte("Abcdef"), Port: 1000},
+			msgID:   100,
+			expData: []byte{0x00, 0x64, 0x00, 0x01, 0x41, 0x62, 0x63, 0x64, 0x65, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xE8},
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			c := &MsgCodec{}
+
+			data, err := c.EncodeMsg(test.msg, test.msgID)
+			if err != nil {
+				t.Fatalf("expected nil error, got: %v", err)
+			}
+			if !bytes.Equal(data, test.expData) {
+				t.Fatalf("expected data: % 0X, got: % 0X", test.expData, data)
+			}
+		})
+	}
+}
+
+func TestEncodePanic(t *testing.T) {
+	c := &MsgCodec{}
+
+	msg := &MyMsg{Index: 1, Label: []byte("thisIsLongerThan16Bytes"), Port: 1000}
+
+	_, err := c.EncodeMsg(msg, 100)
+	if err == nil {
+		t.Fatalf("expected non-nil error, got: %v", err)
+	}
+}